From: asadovnikov (asadovnikov@comcast.net)
Date: Fri Oct 01 2004 - 00:16:27 GMT-3
David,
You can not decrease latency by increasing queue size. The queuing latency
is exactly that how long the packet sit in the queue, by increasing queue
length you are increasing possible maximum (and in your conditions probably
the average latency), on the other side of the token it would lead to less
drops within the class. On the surface 8K for signaling appears sufficient,
but obviously it does not work well for you. Did you look into what
actually is matched to ensure that some other traffic is not getting
classified as signaling. BTW how many same time calls do you support /
which codec?
To cut long story short, make sure matching is right, and then increase
bandwidth if not sufficient.
Best Regards,
Alexei
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
David Duncon
Sent: Thursday, September 30, 2004 8:40 AM
To: ccielab@groupstudy.com
Subject: Queue-limit xx with in LLQ
Hello Group,
I got a real world situation where I am running LLQ between HUB and Spoke to
protect voice on a 192k PVC. In the recent past I have been noticing large %
of signaling drops. Even though allocated 8k for 12 x 7960s should be fine ,
I am considering to increase the signaling band width to may be 15k. But
before I do that , I just want to try our *queue-limit* command under
class-map of Signaling in order to reduce the current latency existing on
Signaling queue.
I do understand that in the absence of RED or WRED , this queue-limit value
will define the *number of packets* queued for a given traffic class.
So my Qs are , 1) what is the default queue-limit value for Signaling
traffic in general 2) what queue-limit value can I set for Signaling traffic
in order to reduce the current latency 3) Is this queue-limit value should
be different for RTP (even though there is NO latency for RTP packets now /
i.e I have No drops on this queue)and RTCP/Signalling in the following
config. If yes , why they should be different.
Policy-map VOIP-192
Class voip-rtp
Priority 100
Class voip-signaling
Bandwidth 8
Queue-limit ?? ----------------------------> would like to set statically
configure this value before I increase the allocated B/w for signaling, but
not sure how much should I go for?
I really appreciate any timely feed back :-)
Thanks in advance
David.
This archive was generated by hypermail 2.1.4 : Sat Nov 06 2004 - 17:11:41 GMT-3