Depends on the frame switch, I think. I asked our telco about this as well (quite a while ago), and they said that on entry to the "cloud", they automatically reset any DE bits set. So either way, your scheme isn't likely to work, but how much of a negative effect it has will depend on whether your telco drops entering DE packets or just resets the DE bits.
JMcL Steven A. Ridder wrote: > > This was Cisco's old theory. In theory, it would work, but in > reality, if > the frame switch saw a packet come into it's ingress interface > with the > packet already marked DE, it will drop it because it was > unexpected. > > I asked the telco's your question last year and that's the > answer they gave > me. Cisco seems to have abandoned that theory a while ago, > which is > probably why you haven't seen it written anywhere. > > > ""dj"" wrote in message > news:200210171534.PAA26762@;groupstudy.com... > > Running a VoIP application over a frame-relay network with > 256k CIR and > > 512k BIR. From the LLQ docs I reviewed, to guarantee good > voice > > quality, traffic shaping all frame traffic to CIR is > recommended along > > with LLQ of voice packets. > > > > Would like to take advantage of BIR bandwidth and still > guarantee voice > > packets are not dropped by the frame relay switch network when > > congestion occurs. Here are my thoughts: > > > > What if the router were to pre-mark all data packets as > "Discard > > Eligible" (DE) on the outbound serial interface connected to > the frame > > network. Voice packets would NOT be marked DE. Then run up > to BIR > > rates with LLQ prioritization for voice. Would the carrier > frame network > > switches drop only the pre-marked DE data packets (by the > router) when > > congestion occurred and NOT drop any voice packets? I > haven't found any > > Cisco links that addressed QOS in this fashion. Any links on > this topic > > would be greatly appreciated. > > > > The objective is to squeeze more bandwidth (BIR vs CIR) out > of your > > frame relay network without dropping any voice packets. Why > would this > > not work and what are the caveats? > > > > regards, > > dj > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=56110&t=55833 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
