When you configure campus QoS, by using Auto QoS; an input queue will be
created. This will prevent from the phone/trusted device from potentially
abusing the EF queue when the traffic crosses the WAN. (Assuming you are not
using NBAR to reclassify traffic sent across the WAN)
From the QoS SRND:
Shaped or Shared bandwidth weights can be assigned to a queue via the
srr-queue bandwidth shape and srr-queue bandwidth share
interface commands. Shaped mode weights override shared mode weights
and use an inverse ratio (1/weight) to determine the shaping bandwidth
for the queue. Furthermore, if shaped weights are set to 0, then the
queue is operating in shared mode. For example, the following interface
command srr-queue bandwidth shape 3 0 0 0 would shape Q1 to 1/3 of the
available bandwidth and set all other queues to operate in sharing mode.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_50_se/configuration/guide/swqos.html#wp1202482
If you configure a weight of 0, the corresponding queue operates in shared
mode. The weight specified with the srr-queue bandwidth shape command is
ignored, and the weights specified with the srr-queue bandwidth share
interface configuration command for a queue come into effect. When
configuring queues in the same queue-set for both shaping and sharing,
make sure that you configure the lowest number queue for shaping.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_50_se/configuration/guide/swqos.html#wp1200681
-Chase
--
If winners never quit and quitters never win, then who coined the phrase, Quit
while you’re still ahead.?
Date: Tue, 14 Feb 2012 08:12:24 +0800
From: ascanio.al...@gmail.com
To: ccie_voice@onlinestudylist.com
Subject: [OSL | CCIE_Voice] Ebook Lab 4: Campus QoS Task 3.1 - 25% bandwidth
cap per queue
Task 3.1
configure campus qos
* egress media in the priority queue
* egress signal in the second queue
* do not permit any queue to exceed 25% of the total allowable bandwidth
Solution:
int f1/0/2
auto qos voip cisco-phone
!--- adjust auto qos
int f1/02
srr-queue bandw shape 4 4 4 4
priority-queue out
service-policy input XXX
Don't quite understand the solution here:
From Vik's explanation
I put an asterisks for the rate limiting requirement of 25% for each queue
because priority
queue command will allow Q1 to use 100% of the queue up to the service-policy
applied there.
However, the configuration of “4 4 4 4” means each queue is configured to not
exceed 1/4 or 25% of the bandwidth.
This para confuses me re queue and bandwidth:the PQ will get 100% of the queue,
but I thought that the srr shape won't be able to limit Q1, since PQ trumps
eveything else.
Furthermore the service-policy is an input policy, what does this have to do
with egress queueing?
___
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Are you a CCNP or CCIE and looking for a job? Check out
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