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=55833&t=55833 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
