Scott,
In my opinion enabling / disabling the priority queue has no effect on
your requirement. Q1 will be limited to 25% of Interface BW as a
result of your shape and share commands.
Enabling the PQ will result in Pkts in that Q to be serviced in strict
priority subject to the 25% cap and is probably more inline with
ciscos recommendations for RTP traffic.
My 2 cents
-pavan
Sent from my phone
On Feb 15, 2010, at 9:31 PM, scott carruthers
<scarruthe...@hotmail.com> wrote:
Bump - anyone have thoughts on this one?
From: scarruthe...@hotmail.com
To: ccie_voice@onlinestudylist.com
Date: Sun, 14 Feb 2010 10:40:58 -0800
Subject: [OSL | CCIE_Voice] Adjust 3750 Egress Priority Queue
Bandwidth
I wanted some thoughts on how others would handle a request to
tweak the amount of bandwidth availble to an egress priority queue
on a 3750. So for example a request to allocate 25% of available
bandwidth for switchports connected to IP phones on the 3750.
I have heard suggestions to handle this in the following manner -
this is assuming auto qos voip trust cisco-phone has been run on the
port already:
interface fa 1/0/2
no priority-queue out
srr-queue bandwidth shape 4 0 0 0
srr-queue bandwidth share 0 33 33 33
But I'm struggling to see that this meets the requirement. In this
configuration we would be enabling shaping of queue 1 and assigning
it 25% of available bandwidth. Then assigning remaining bandwidth
equally to the remaining three queues. But this does not appear to
be meeting the requirement of assigning the priority queue 25% of
the bandwidth. We would be assigning the queue that RTP traffic is
placed in by default 25% of total bandwidth but the initial no
priority queue out command technically disables a strict priority
queue and thus it does not seem to fit the requirement.
Thoughts? While I struggle to see the disablement of the priority
queue as strictly meeting the requirement - I also find no explicit
means to allocate the priority queue a strict amount of bandwidth
(I.e. the equal if the ingress queue command - mls qos srr-queue
input bandwidth 75 25 that could be used to meet this requirement
for default priority ingress queue 1. How about skipping the
initial no priority queue-out command but only issuing the shape and
share commands as specified above? Wouldn't leaving the priority
queue enabled and assigning it a shape value of 25% (1/4) satsify
the requirement better?
Thanks
Scott
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