From: Antonio Soares (amsoares@netcabo.pt)
Date: Thu Nov 22 2007 - 22:20:49 ART
In the 3550, the priority queue is queue #4.
In the 3560, the priority queue is queue #1.
Check the "Enterprise QoS Solution Reference Network Design Guide" chapter
2. It contains almost everything you need to know about LAN Switching QoS:
http://www.cisco.com/en/US/products/hw/switches/ps5528/products_implementati
on_design_guides_list.html
Regards,
Antonio Soares
CCIE #18473 (R&S),CCNP,CCIP,JNCIA-ER
http://pwp.netcabo.pt/amsoares/
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
iosluver@gmail.com
Sent: quinta-feira, 22 de Novembro de 2007 16:09
To: ccielab@groupstudy.com
Subject: 3550 Priority Queue
Hi Group,
I read a CCO document which seemed to imply that when the expedite queue is
enabled with priority queue out, Q4 is not used. My understanding of this &
the output of "sh mls qos int g0/1 queueing" (correct me if I'm wrong) is:-
If Priority Queue is enabled, the queuing strategy will empty Q4 & check for
example Q1. The checks Q4, if there no packets, it moves to Q2. And
continues in this manner giving priority to Q4.
IF Priority queue is disabled, the queuing strategy for the Q4 then depend
on the weight, queue limit defined for the port in question.
With Expedite disabled
**********************
interface GigabitEthernet0/1
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 3
wrr-queue cos-map 3 4
wrr-queue cos-map 4 5 6 7
end
sh mls qos int g0/1 qu
GigabitEthernet0/1
Egress expedite queue: dis
wrr bandwidth weights:
qid-weights
1 - 20
2 - 15
3 - 15
4 - 50
With Expedite enabled
**********************
interface GigabitEthernet0/1
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 3
wrr-queue cos-map 3 4
wrr-queue cos-map 4 5 6 7
priority-queue out
end
sh mls qos int g0/1 queueing
GigabitEthernet0/1
Egress expedite queue: ena
wrr bandwidth weights:
qid-weights
1 - 20
2 - 15
3 - 15
4 - 50 when expedite queue is disabled
Thanks
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