From: simon hart (simon@harttel.com)
Date: Mon Nov 14 2005 - 14:12:10 GMT-3
Hi Bob,
Understood and agreed. It polices under congestion conditions
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Bob
Sinclair
Sent: 14 November 2005 16:23
To: simon hart; ccielab@groupstudy.com
Subject: Re: Priority Queuing question
Simon,
Perhaps I misunderstood your comment, but just to be clear: the MQC
priority
command will police prioritized flows only under conditions of congestion.
But the flows will take all the bandwidth they require otherwise. As long
as
the bandwidth is available, the priority command does not police. If you
want to set a hard cap on prioritized traffic, you will need to add a police
command. Some (othterwise) very good documentation is wrong on this point.
Try labbing it up.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427
www.netmasterclass.net
----- Original Message -----
From: simon hart
To: steven richards ; ccielab@groupstudy.com
Sent: Monday, November 14, 2005 10:37 AM
Subject: RE: Priority Queuing question
Hi Steven,
The commands below will guarantee 128kbps and no more, there is no burst
above 128kbps.
The priority command has two functions, one is to prioritise the packets
assigned to this queue, that is they will be the first out of the
interface.
The second function is to police the packets to the bandwidth required.
Now the show policy map
Bandwidth 128 (kbps) Burst 3200 (Bytes)
is showing you what the committed burst rate is, not the excess burst.
MQC tc in this scenario defaults to 200ms, therefore 128000 *.2 = 25600.
Convert to bytes 25600 /8 = 3200 bytes. Therefore for each 200ms, the
policer will allow 25600 bits to be sent, and thus 128kbps no more no less
HTH
Simon
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
steven richards
Sent: 14 November 2005 04:34
To: ccielab@groupstudy.com
Subject: Priority Queuing question
Hello,
I am trying to use priority queueing beacuse I am interested in
guarenteing
a certain amount of bandwidth, withought going over the guereenteed
bandwidth. One thing I noticed is that with configuring priority queueing
there appears to be a burst automatically configured. Is there a way to
just
configure priority queueing withought that autoconfugred burst ?
Thanks,
R2#show policy-map interface e0/0
Ethernet0/0
Service-policy output: QOS
Class-map: PREC2 (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: ip precedence 2
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 128 (kbps) Burst 3200 (Bytes) <----- Burst
automatically
configured ?
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
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