what does becn and fecn high value indicate?
hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: what does becn and fecn high value indicate?
thanks a lot -Original Message- From: Atif Awan [mailto:[EMAIL PROTECTED]] Sent: Monday, September 18, 2000 5:48 PM To: Yee, Jason; cisco@groupstudy. com (E-mail) Subject: Re: what does becn and fecn high value indicate? BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: what does becn and fecn high value indicate?
BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: what does becn and fecn high value indicate?
If the router receives any BECNs during the current time interval, it decreases the transmit rate by 25%. The rate will continue to drop with each BECN (limit one drop per time interval) until the traffic rate gets to the minimum acceptable incoming or outgoing committed information rate (MINCIR), where it stops. Once the traffic rate has decreased, it takes 16 time intervals of receiving no BECNs to start to increase traffic again. Traffic increases (Be+Bc)/16, or more accurately, the byte limit that shows up in show traffic and show frame-relay pvc x divided by 16. Thus, it takes much longer to get back to committed information rate (CIR) than it did to drop to the MINCIR (similar to slow start in TCP/IP). One way of making this length of time much shorter would be to set "Be" 7 times the value of "Bc," which would ensure it gets back to CIR immediately after going through 16 time intervals without a BECN. Also of note is that this increase only occurs when traffic shaping is active. If traffic shaping is not active, the transmit increment stays the same even though BECNs are not being received. --Original Message-- From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: September 18, 2000 7:15:52 AM GMT Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Jorge Rodriguez /CCNA Network Analyst RS Networks Inc 1112 Boylston Street Suite 222 Boston, MA 02115 1-781-614-1294 1-617-989-8634 Evenings http://www.netwire.n3.net/ http://www.learncisco.n3.net/ iWon.com http://www.iwon.com why wouldn't you? **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: what does becn and fecn high value indicate?
Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RV: what does becn and fecn high value indicate?
it means that a frame relay switch is sending you an advise to slow down the traffic load on this dlci... a frame relay switch sends a FECN to the destination dte and a BECN to the source dte when it encounters congestion somwhere un the switching path. you can use th interface command frame-relay traffic-shapping to let the source router trottle down the traffic when it receives a BECN... good luck :) -Mensaje original- De: Yee, Jason [SMTP:[EMAIL PROTECTED]] Enviado el: Monday, September 18, 2000 4:16 AM Para: cisco@groupstudy. com (E-mail) Asunto: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: what does becn and fecn high value indicate?
The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: what does becn and fecn high value indicate?
Of course you cannot control the FECN and BECN bits. What you can do though is adjust the manner in which your IP traffic negotiates moving from fast links to slower links (LAN to WAN etc). This is where the bandwidth command amongst others can be useful. For example, routing off a fast ethernet port across the router into one of its serial ports requires a slowing of traffic. Serial ports cannot handle anywhere near 100mb of traffic. There are a number of ways one can handle this; prioritizing, queueing and using the bandwidth parameter are a few that spring to mind. Each has its own merits and limitations so further investigation is warranted... From: "Ejay Hire" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 11:12:20 CDT The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: what does becn and fecn high value indicate?
The bandwidth command will not affect the speed of your WAN link. Depending on what routing protocol you are using, it may affect routing preference. If you have a steady (ish) 100Mb of traffic (or even 10Mb) coming into a serial port, no amount of prioritisation or queuing will help you, either, although they can help if it's just short bursts of heavy traffic. Frame relay traffic shaping can also help smooth out bursts of traffic, and (as someone else has already responded), it can also throttle back traffic if the carrier network is congested. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 19/09/2000 09:28 am --- "Frank Wells" [EMAIL PROTECTED] on 19/09/2000 03:41:46 am Please respond to "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] cc:(bcc: JENNY MCLEOD/NSO/CSDA) Subject: Re: what does becn and fecn high value indicate? Of course you cannot control the FECN and BECN bits. What you can do though is adjust the manner in which your IP traffic negotiates moving from fast links to slower links (LAN to WAN etc). This is where the bandwidth command amongst others can be useful. For example, routing off a fast ethernet port across the router into one of its serial ports requires a slowing of traffic. Serial ports cannot handle anywhere near 100mb of traffic. There are a number of ways one can handle this; prioritizing, queueing and using the bandwidth parameter are a few that spring to mind. Each has its own merits and limitations so further investigation is warranted... From: "Ejay Hire" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 11:12:20 CDT The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED], "cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html
RE: what does becn and fecn high value indicate?
thanks for your explanation , it is very technical though Jason -Original Message- From: Jorge Rodriguez [mailto:[EMAIL PROTECTED]] Sent: Monday, September 18, 2000 11:11 PM To: Yee, Jason; cisco@groupstudy. com (E-mail) Cc: [EMAIL PROTECTED] Subject: RE: what does becn and fecn high value indicate? If the router receives any BECNs during the current time interval, it decreases the transmit rate by 25%. The rate will continue to drop with each BECN (limit one drop per time interval) until the traffic rate gets to the minimum acceptable incoming or outgoing committed information rate (MINCIR), where it stops. Once the traffic rate has decreased, it takes 16 time intervals of receiving no BECNs to start to increase traffic again. Traffic increases (Be+Bc)/16, or more accurately, the byte limit that shows up in show traffic and show frame-relay pvc x divided by 16. Thus, it takes much longer to get back to committed information rate (CIR) than it did to drop to the MINCIR (similar to slow start in TCP/IP). One way of making this length of time much shorter would be to set "Be" 7 times the value of "Bc," which would ensure it gets back to CIR immediately after going through 16 time intervals without a BECN. Also of note is that this increase only occurs when traffic shaping is active. If traffic shaping is not active, the transmit increment stays the same even though BECNs are not being received. --Original Message-- From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: September 18, 2000 7:15:52 AM GMT Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Jorge Rodriguez /CCNA Network Analyst RS Networks Inc 1112 Boylston Street Suite 222 Boston, MA 02115 1-781-614-1294 1-617-989-8634 Evenings http://www.netwire.n3.net/ http://www.learncisco.n3.net/ iWon.com http://www.iwon.com why wouldn't you? **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: what does becn and fecn high value indicate?
thank you , I will try that out thanks for your valuable comments -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Omar Baceski Sent: Monday, September 18, 2000 11:15 PM To: [EMAIL PROTECTED] Subject: RV: what does becn and fecn high value indicate? it means that a frame relay switch is sending you an advise to slow down the traffic load on this dlci... a frame relay switch sends a FECN to the destination dte and a BECN to the source dte when it encounters congestion somwhere un the switching path. you can use th interface command frame-relay traffic-shapping to let the source router trottle down the traffic when it receives a BECN... good luck :) -Mensaje original- De: Yee, Jason [SMTP:[EMAIL PROTECTED]] Enviado el: Monday, September 18, 2000 4:16 AM Para: cisco@groupstudy. com (E-mail) Asunto: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: what does becn and fecn high value indicate?
thanks you guys for your valuable comments I have a good and clearer picture now thanks Jason -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Frank Wells Sent: Tuesday, September 19, 2000 12:42 AM To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Of course you cannot control the FECN and BECN bits. What you can do though is adjust the manner in which your IP traffic negotiates moving from fast links to slower links (LAN to WAN etc). This is where the bandwidth command amongst others can be useful. For example, routing off a fast ethernet port across the router into one of its serial ports requires a slowing of traffic. Serial ports cannot handle anywhere near 100mb of traffic. There are a number of ways one can handle this; prioritizing, queueing and using the bandwidth parameter are a few that spring to mind. Each has its own merits and limitations so further investigation is warranted... From: "Ejay Hire" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 11:12:20 CDT The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html __
Re: what does becn and fecn high value indicate?
the bandwidth command is just for informational purposes. Routing protocols that rely on link bandwidth for metric calculation ( like OSPF, IGRP, EIGRP ) use this parameter. It has no effect on the actual throughput on the WAN link. -Original Message- From: Frank Wells [EMAIL PROTECTED] To: [EMAIL PROTECTED] [EMAIL PROTECTED] Date: Monday, September 18, 2000 12:58 PM Subject: Re: what does becn and fecn high value indicate? Of course you cannot control the FECN and BECN bits. What you can do though is adjust the manner in which your IP traffic negotiates moving from fast links to slower links (LAN to WAN etc). This is where the bandwidth command amongst others can be useful. For example, routing off a fast ethernet port across the router into one of its serial ports requires a slowing of traffic. Serial ports cannot handle anywhere near 100mb of traffic. There are a number of ways one can handle this; prioritizing, queueing and using the bandwidth parameter are a few that spring to mind. Each has its own merits and limitations so further investigation is warranted... From: "Ejay Hire" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 11:12:20 CDT The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New
Re: what does becn and fecn high value indicate?
You are absolutely right Atif. My bad, I was thinking of the frame relay traffic shaping process but could not remember the name of it at time of writing. - Original Message - From: Atif Awan [EMAIL PROTECTED] To: Frank Wells [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Tuesday, September 19, 2000 4:32 AM Subject: Re: what does becn and fecn high value indicate? the bandwidth command is just for informational purposes. Routing protocols that rely on link bandwidth for metric calculation ( like OSPF, IGRP, EIGRP ) use this parameter. It has no effect on the actual throughput on the WAN link. -Original Message- From: Frank Wells [EMAIL PROTECTED] To: [EMAIL PROTECTED] [EMAIL PROTECTED] Date: Monday, September 18, 2000 12:58 PM Subject: Re: what does becn and fecn high value indicate? Of course you cannot control the FECN and BECN bits. What you can do though is adjust the manner in which your IP traffic negotiates moving from fast links to slower links (LAN to WAN etc). This is where the bandwidth command amongst others can be useful. For example, routing off a fast ethernet port across the router into one of its serial ports requires a slowing of traffic. Serial ports cannot handle anywhere near 100mb of traffic. There are a number of ways one can handle this; prioritizing, queueing and using the bandwidth parameter are a few that spring to mind. Each has its own merits and limitations so further investigation is warranted... From: "Ejay Hire" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 11:12:20 CDT The fecn becn bits are set by the frame-relay switch(es) whenever there is congestion in the cloud. Nothing you can do on the router will make them not be set, they are a flow control mechanism. Original Message Follows From: "Frank Wells" [EMAIL PROTECTED] Reply-To: "Frank Wells" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 08:22:38 PDT Hey Atif, If I recall correctly, doesn't setting the 'bandwidth'command on the WAN link (frame relay in this case) resolve this problem? From: "Atif Awan" [EMAIL PROTECTED] Reply-To: "Atif Awan" [EMAIL PROTECTED] To: "Yee, Jason" [EMAIL PROTECTED],"cisco@groupstudy. com \(E-mail\)" [EMAIL PROTECTED] Subject: Re: what does becn and fecn high value indicate? Date: Mon, 18 Sep 2000 14:48:27 +0500 BECN stands for Backward Explicit Congestion Notification. This indicates that there is congestion in the path opposite to the packets which have this BECN bit set. In your case you are getting a lot of packets with this BECN bit set and this is not a good sign. There is congestion outwards from your router. Regards Atif - Original Message - From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: Monday, September 18, 2000 12:15 PM Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html ___
RE: what does becn and fecn high value indicate?
Basically, BECNs and FECNs indicate that the frame relay network is congested somewhere along your PVC. You're getting a lot of 'in BECN packets' but no 'in FECN packets', which means that the congestion is affecting traffic going from this end of the PVC to the other end. The congestion may or may not be caused by your traffic. If you have frame relay traffic shaping turned on, then if your router receives BECNs, it will throttle back the outgoing traffic on that PVC. When the BECNs go away again, it will gradually increase the traffic rate. Have a look at the router at the OTHER end of your PVC if you can (same command). You will probably see a lot of 'in FECN packets'. If you also have a lot of 'in DE packets', then you are at risk of getting a lot of packets dropped - Discard Eligible packets will be dropped in preference to non-DE packets. If you send a lot of traffic at a rate above your CIR, you might want to increase your CIR. It won't directly help the congestion, but it will mean less of your traffic is marked DE (so it's less likely to be dropped), and also many carriers provision their networks on the basis of purchased CIR - so it might prompt your carrier to upgrade. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 19/09/2000 02:13 pm --- "Yee, Jason" [EMAIL PROTECTED] on 19/09/2000 11:54:42 am Please respond to "Yee, Jason" [EMAIL PROTECTED] To: "'Jorge Rodriguez'" [EMAIL PROTECTED] "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: RE: what does becn and fecn high value indicate? thanks for your explanation , it is very technical though Jason -Original Message- From: Jorge Rodriguez [mailto:[EMAIL PROTECTED]] Sent: Monday, September 18, 2000 11:11 PM To: Yee, Jason; cisco@groupstudy. com (E-mail) Cc: [EMAIL PROTECTED] Subject: RE: what does becn and fecn high value indicate? If the router receives any BECNs during the current time interval, it decreases the transmit rate by 25%. The rate will continue to drop with each BECN (limit one drop per time interval) until the traffic rate gets to the minimum acceptable incoming or outgoing committed information rate (MINCIR), where it stops. Once the traffic rate has decreased, it takes 16 time intervals of receiving no BECNs to start to increase traffic again. Traffic increases (Be+Bc)/16, or more accurately, the byte limit that shows up in show traffic and show frame-relay pvc x divided by 16. Thus, it takes much longer to get back to committed information rate (CIR) than it did to drop to the MINCIR (similar to slow start in TCP/IP). One way of making this length of time much shorter would be to set "Be" 7 times the value of "Bc," which would ensure it gets back to CIR immediately after going through 16 time intervals without a BECN. Also of note is that this increase only occurs when traffic shaping is active. If traffic shaping is not active, the transmit increment stays the same even though BECNs are not being received. --Original Message-- From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: September 18, 2000 7:15:52 AM GMT Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Jorge Rodriguez /CCNA Network Analyst RS Networks Inc 1112 Boylston Street Suite 222 Boston, MA 02115 1-781-614-1294 1-617-989-8634 Evenings http://www.netwire.n3.net/ http://www.learncisco.n3.net/ iWon.com http://www.iwon.com why wouldn't you? **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: ht
RE: what does becn and fecn high value indicate?
thanks your explanation is crystal clear Jason -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, September 19, 2000 11:22 AM To: [EMAIL PROTECTED] Subject: RE: what does becn and fecn high value indicate? Basically, BECNs and FECNs indicate that the frame relay network is congested somewhere along your PVC. You're getting a lot of 'in BECN packets' but no 'in FECN packets', which means that the congestion is affecting traffic going from this end of the PVC to the other end. The congestion may or may not be caused by your traffic. If you have frame relay traffic shaping turned on, then if your router receives BECNs, it will throttle back the outgoing traffic on that PVC. When the BECNs go away again, it will gradually increase the traffic rate. Have a look at the router at the OTHER end of your PVC if you can (same command). You will probably see a lot of 'in FECN packets'. If you also have a lot of 'in DE packets', then you are at risk of getting a lot of packets dropped - Discard Eligible packets will be dropped in preference to non-DE packets. If you send a lot of traffic at a rate above your CIR, you might want to increase your CIR. It won't directly help the congestion, but it will mean less of your traffic is marked DE (so it's less likely to be dropped), and also many carriers provision their networks on the basis of purchased CIR - so it might prompt your carrier to upgrade. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 19/09/2000 02:13 pm --- "Yee, Jason" [EMAIL PROTECTED] on 19/09/2000 11:54:42 am Please respond to "Yee, Jason" [EMAIL PROTECTED] To: "'Jorge Rodriguez'" [EMAIL PROTECTED] "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] cc: [EMAIL PROTECTED] (bcc: JENNY MCLEOD/NSO/CSDA) Subject: RE: what does becn and fecn high value indicate? thanks for your explanation , it is very technical though Jason -Original Message- From: Jorge Rodriguez [mailto:[EMAIL PROTECTED]] Sent: Monday, September 18, 2000 11:11 PM To: Yee, Jason; cisco@groupstudy. com (E-mail) Cc: [EMAIL PROTECTED] Subject: RE: what does becn and fecn high value indicate? If the router receives any BECNs during the current time interval, it decreases the transmit rate by 25%. The rate will continue to drop with each BECN (limit one drop per time interval) until the traffic rate gets to the minimum acceptable incoming or outgoing committed information rate (MINCIR), where it stops. Once the traffic rate has decreased, it takes 16 time intervals of receiving no BECNs to start to increase traffic again. Traffic increases (Be+Bc)/16, or more accurately, the byte limit that shows up in show traffic and show frame-relay pvc x divided by 16. Thus, it takes much longer to get back to committed information rate (CIR) than it did to drop to the MINCIR (similar to slow start in TCP/IP). One way of making this length of time much shorter would be to set "Be" 7 times the value of "Bc," which would ensure it gets back to CIR immediately after going through 16 time intervals without a BECN. Also of note is that this increase only occurs when traffic shaping is active. If traffic shaping is not active, the transmit increment stays the same even though BECNs are not being received. --Original Message-- From: "Yee, Jason" [EMAIL PROTECTED] To: "cisco@groupstudy. com (E-mail)" [EMAIL PROTECTED] Sent: September 18, 2000 7:15:52 AM GMT Subject: what does becn and fecn high value indicate? hi , Anyone Knows what the BECN and FECN in sh frame-relay pvc indicates : and a high BECN indicates what? PVC Statistics for interface Hssi4/1 (Frame Relay DTE) DLCI = 299, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Hssi4/1.10 input pkts 1263236605output pkts 1388118986 in bytes 2167041222 out bytes 3760560232 dropped pkts 1 in FECN pkts 0 in BECN pkts 791683517 out FECN pkts 0 out BECN pkts 0 in DE pkts 29527 out DE pkts 0 out bcast pkts 16346 out bcast bytes 5868214 pvc create time 11w6d, last time pvc status changed 05:27:23 thanks Jason **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Jorge Rodriguez /CCNA Network Analyst RS Networks Inc 1112 Boylston Street Suite 222 Boston, MA 02115 1-781-614-1294 1-617-989-8634 Evenings http://www.netwire.n3.net/ http://www.learncisco.n3.net/ iWon.com http://www.iwon.com why wouldn't you? .
