Fw: DE bits [7:15210]
- Original Message - From: Mike Mandulak To: Chuck Larrieu Sent: Wednesday, August 08, 2001 6:31 AM Subject: Re: DE bits [7:15210] That's what I thought, when I confronted them on it they basically said that since I have a full T1 all traffic will go through. But my Q is if it has DE set through to their CO, does the DE bit stay set as it traverses the internet and thru other providers? Even if it get transformed into say ATM frames or whatever on it's way? I think they are feeding me a line... - Original Message - From: Chuck Larrieu To: Mike Mandulak ; Sent: Wednesday, August 08, 2001 1:04 AM Subject: RE: DE bits [7:15210] nope. with a 0 CIR anything greater than 0 is DE. your telco is not guaranteeing that they will ever pass any of your traffic. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Mike Mandulak Sent: Tuesday, August 07, 2001 9:17 PM To: [EMAIL PROTECTED] Subject: DE bits [7:15210] Do discard Eligible bits (DE) get set on lines that are full T1's? The circuit I'm looking at is a full T1 to one of my internet providers and when looking at the frame stats (using cisco LMI) I see that that the cir is set to zero which would mean that all frames leave my site with the DE bit set. Am I misunderstanding this? MikeM Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=15242t=15210 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Fw: DE bits [7:15210]
- Original Message - From: Mike Mandulak To: Tony Medeiros Sent: Wednesday, August 08, 2001 6:42 AM Subject: Re: DE bits [7:15210] Sort of... That's the way that I understood it to work. The LMI type is set to Cisco and when I issue the show frame-relay pvc command, the IOS report the cir as being set to 0. On of my other Internet connections through a different provider (also non-channelized T1) the cir is reported as being 768 which is what I would expect. - Original Message - From: Tony Medeiros To: Sent: Wednesday, August 08, 2001 1:14 AM Subject: Re: DE bits [7:15210] A Cisco router will never set the DE bits unless specifically told to do so with a frame relay DE list. The frame cloud sets the DE bit on your traffic if you exceed the CIR or burst committed data rate for your PVC. This means that if the cloud experiences congestion, the frames with the DE bits are the first into the bit bucket. Theoretically this is the way it's supposed to work. More times than not the frame cloud will mark your frames DE even if you not exceed you SLA. Then it's time to call the provider. Generally, DE bits have nothing to do with port speed. Port speed is just the speed of the link you have to the frame switch. Traffic shaping has more effect on the rate you send to each PVC. It's a little complicated. An easy way to show what the provider is giving you is to set up the traffic shaping to correspond to the SLA for the PVC. Then do a sho frame PVC to see the stats. DE marked frames and BECN's and FECN's, MAY be an indicator that you are not getting the SLA you should. These parameters are CRITICAL in voice over data applications. Does this help at all ?? Tony M. #6172 - Original Message - From: Mike Mandulak To: Sent: Tuesday, August 07, 2001 9:16 PM Subject: DE bits [7:15210] Do discard Eligible bits (DE) get set on lines that are full T1's? The circuit I'm looking at is a full T1 to one of my internet providers and when looking at the frame stats (using cisco LMI) I see that that the cir is set to zero which would mean that all frames leave my site with the DE bit set. Am I misunderstanding this? MikeM Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=15243t=15210 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Fw: DE bits [7:15210]
Yes, DE bits will stay on as it traverses the frame network. With DE set, any switch along the path that has congestion will toss you out before one without DE set. If you are running a CIR of 0 (as with most Sprint frame circuits), you always run the risk of having to retransmit. However, they supposedly design their frame network so that you never have to. Mike Mike Mandulak wrote: - Original Message - From: Mike Mandulak To: Tony Medeiros Sent: Wednesday, August 08, 2001 6:42 AM Subject: Re: DE bits [7:15210] Sort of... That's the way that I understood it to work. The LMI type is set to Cisco and when I issue the show frame-relay pvc command, the IOS report the cir as being set to 0. On of my other Internet connections through a different provider (also non-channelized T1) the cir is reported as being 768 which is what I would expect. - Original Message - From: Tony Medeiros To: Sent: Wednesday, August 08, 2001 1:14 AM Subject: Re: DE bits [7:15210] A Cisco router will never set the DE bits unless specifically told to do so with a frame relay DE list. The frame cloud sets the DE bit on your traffic if you exceed the CIR or burst committed data rate for your PVC. This means that if the cloud experiences congestion, the frames with the DE bits are the first into the bit bucket. Theoretically this is the way it's supposed to work. More times than not the frame cloud will mark your frames DE even if you not exceed you SLA. Then it's time to call the provider. Generally, DE bits have nothing to do with port speed. Port speed is just the speed of the link you have to the frame switch. Traffic shaping has more effect on the rate you send to each PVC. It's a little complicated. An easy way to show what the provider is giving you is to set up the traffic shaping to correspond to the SLA for the PVC. Then do a sho frame PVC to see the stats. DE marked frames and BECN's and FECN's, MAY be an indicator that you are not getting the SLA you should. These parameters are CRITICAL in voice over data applications. Does this help at all ?? Tony M. #6172 - Original Message - From: Mike Mandulak To: Sent: Tuesday, August 07, 2001 9:16 PM Subject: DE bits [7:15210] Do discard Eligible bits (DE) get set on lines that are full T1's? The circuit I'm looking at is a full T1 to one of my internet providers and when looking at the frame stats (using cisco LMI) I see that that the cir is set to zero which would mean that all frames leave my site with the DE bit set. Am I misunderstanding this? MikeM Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=15360t=15210 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Fw: DE bits [7:15210]
- Original Message - From: Mike Mandulak To: Michael Damkot ; Sent: Wednesday, August 08, 2001 9:05 PM Subject: Re: DE bits [7:15210] That's not true. The DE bit gets set when the bandwidth exceeds the CIR. I.E you can buy a 128K CIR with a burst to 1544K, the DE gets set when the bandwidth exceeds 128K. My concern came in when I saw the BW=0. Now when I do a debug lmi it show BW=1000. Anyone know the significance of the 1000? What does it stand for? 1000 whats? MikeM - Original Message - From: Michael Damkot To: Sent: Wednesday, August 08, 2001 7:58 PM Subject: RE: DE bits [7:15210] To Clarify, usually the DE bit is set at Half the CIR, since FR is usually only guaranteed to half the total bandwidth, therefore, the customer can use the total circuit, but if congestion occurs, Frames that are over half the CIR are the first to go.. But you also have to keep in mind there are other things in place to avoid lost data. IE BECN, FECN - Regards, Michael Damkot Technical Trainer Network Support Engineer II -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Tony van Ree Sent: Wednesday, August 08, 2001 3:47 PM To: [EMAIL PROTECTED] Subject: Re: DE bits [7:15210] Hi all, Put simply a DE (Discard Eligible) bit is set on anything above the CIR (Committed Information Rate) ie if it is not committed it is discard eligible. At least that's the way I understand it. Teunis, Hobart, Tasmania Australia On Wednesday, August 08, 2001 at 10:06:06 AM, Brian wrote: I doubt the cir is set to zero, it almost certainly is set to a value below the 1.5 meg value, I'd suspect 768k perhaps. Whomever is the circuit owner can call the telco to find out. Brian - Original Message - From: Mike Mandulak To: Sent: Tuesday, August 07, 2001 9:16 PM Subject: DE bits [7:15210] Do discard Eligible bits (DE) get set on lines that are full T1's? The circuit I'm looking at is a full T1 to one of my internet providers and when looking at the frame stats (using cisco LMI) I see that that the cir is set to zero which would mean that all frames leave my site with the DE bit set. Am I misunderstanding this? MikeM -- www.tasmail.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=15405t=15210 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
