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=7&i=15360&t=15210
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