10-12-2005 11:12 PM - edited 03-03-2019 12:23 AM
From guide:"The strict priority queue is enabled by configuring the fourth queue's weight parameter, as defined in the wrr-queue bandwidth command, to be 0"
Does it mean that after enable on interface #auto qos voip cisco-phone
i didn't enabled strict priority queue?
!
interface FastEthernet0/13
switchport mode dynamic desirable
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
!
10-13-2005 12:52 AM
When you enable auto-qos the strict priority queue is participating in srr. All four queues are used and the fourth (priority-) queue has at least 10% reserved for real-time traffic.
If you configure the priority-queue out command you enable a strict priority queue. The result is that the fourth queue no longer participates in the shaped/shared round robin process.
10-13-2005 02:42 PM
I think you have a documentation cross-wire there.....
The 2950 is the only switch that has the strict priority queue enabled with the global command 'wrr-queue bandwidth' and setting the 4th queues weight to 0.
It looks like you have a 3550 switch there (based on the output). For a 3550 (and a 3750) you enable the ergress expedite queue with the interface command 'priority-queue out'. The 3550 & 3750 are different again though as the strict priority queues are the opposite way around (Q1 on 3750 & Q4 on 3550).
I suggest you check your documentation sources.....
HTH
Andy
10-13-2005 02:53 PM
It has to be 3550 as Andy pointed out . Reason.
it uses a priority-queue out command ( applicable to (3550 / 3560 / 3750/2970 ) but uses Weighted round robin queues . 3750 / 3560 and 2970 use Shaped round robin queues and there are no wrr commands there.
The weight for the 4th queue has no meaning once you enable priorit-queue out command.
D-C3550-1A#sh mls qos interface fastEthernet 0/1 queueing
FastEthernet0/1
Egress expedite queue: ena
wrr bandwidth weights:
qid-weights
1 - 5
2 - 25
3 - 70
4 - 1 when expedite queue is disabled
Cos-queue map:
cos-qid
0 - 2
1 - 1
2 - 3
3 - 3
4 - 3
5 - 4
6 - 3
7 - 3
See how queue 4 mentions that weight only applies when priority queue is disabled. Sinc eyou have priority queue enabled , the weight for queue 4 does not matter and it becomes a "service until empty" queue.
Thanks
Salman Z.
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