At 11:40 AM +0000 10/30/02, [EMAIL PROTECTED] wrote: >Hi Folks, > >I'm still confused on Cisco's Terminology and just want to clarify something >again. > >We all know that priority queuing is the strictest form of queuing, in the >sense that the 'lower' queues have to defer / wait until the 'superior' >queues have been drained, before they (the lower queues) can be serviced. >But then what should I take this to mean? > >(Excerpt from the QoS guide):- >--------------------------- >IP RTP Priority >The IP RTP Priority feature provides a strict priority queueing scheme that >allows delay-sensitive data such as voice to be dequeued and sent before >packets in other queues are dequeued. This feature can be used on serial >interfaces and Frame Relay PVCs in conjunction with either WFQ or CBWFQ on >the same outgoing interface. In either case, traffic matching the range of >UDP ports specified for the priority queue is guaranteed strict priority >over other CBWFQ classes or WFQ flows; packets in the priority queue are >always serviced first. >--------------------------- > >Should I take it to mean that all queuing schemes such is RTP and LLQ, which >use a variant of WFQ as their basis have
I think you know this, but IP RTP Priority is a special case of LLQ. > >(1) 'modified' one queue to be act as a HIGH PQ, or if you like, System >Queue 0 in custom queuing, in that it has to be drained first, before the >other queues get serviced or (1) is how I read the description in "Inside Cisco IOS Software Architecture" > >(2) is it once again, a case of one queue having a higher weight which means >more data gets sent, (but not all data), at each pass. > > >My take on "Strict Priority queuing" and "Guaranteed Strict Priority" is >that once again that specific queue's have to be emptied completely, before >other queue's get serviced, and then and only then does WFQ / CBWFQ do it's >thing on the interface > >Thanks for your insights into this as Cisco's terminology is driving me >kooky! > >Manish > >_______________________________________________________ >Manish Hira ( >) >Network Administrator >If you woke up breathing, Congratulations! >You have another chance! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=56522&t=56519 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
