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 1263236605 output 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
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Jorge Rodriguez /CCNA
Network Analyst
R&S 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?
........................................................
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