From: Clark, Jeffrey (Jeffrey.Clark@nasdaq.com)
Date: Fri Oct 10 2003 - 17:50:40 GMT-3
Actually routing updates and L2 control packets are treated differently.
There is a separate queue, on some routers it's actually part of the default
queue. It's called the pak_priority queue. BGP is handled differently.
With BGP the IP precedence bits are set but not the pak_queue flag.
Here's a document showing this. I actually had this same question and
a Cisco AS guy I was working with explaned it to me.....
http://www.cisco.com/warp/public/105/rtgupdates.html#packet
Jeff Clark
-----Original Message-----
From: Chris Larson [mailto:clarson52@comcast.net]
Sent: Friday, October 10, 2003 4:38 PM
To: Ray Stevens
Cc: ccielab@groupstudy.com
Subject: Re: Class Default
Why wouldn't regular routing updates fall into the class default queue if
you have configured one?
Configuring a class default in my mind is the same as the max reserved
bandwidth. Everything else goes in there.....routing updates and all other
traffic not defined by more explicit classes.
So if you configure class default then I wouldn't see how it would starve.
If you gave your default class 10% or 20% then everything that is not
specified by more explicit classes would get that amount of BW including
regular routing updates.
policy-map MYMAP
Class FTP
match proto FTP
band 25%
Class SMTP
match proto smtp
band 25%
Class WWW
match proto html
band 40%
Class default
band 10% - Everything else....including routing updates....why
then keep the max-reserved-bandwidth?
----- Original Message -----
From: "Ray Stevens" <cisco-guy@rogers.com>
To: <ccielab@groupstudy.com>
Sent: Friday, October 10, 2003 4:01 PM
Subject: RE: Class Default
> Doesnt the reserve bandwidth also allow for regular routing updates, and i
> seem to remember reading assigning 100% to queuing could in effect starve
> the bandwidth required for routing updates.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Chris Larson
> Sent: Friday, October 10, 2003 1:39 PM
> To: ccielab@groupstudy.com
> Subject: Class Default
>
>
> If we are asked to configure multiple classes for CBWFQ and a class for
all
> other traffic ( a default) then wouldn't it be the case that we should
make
> max reserved bandwidth 0
>
> Any traffic that does not confirm to the defined classes would go into the
> configure default class and therefore I think you would not want to keep
any
> reserved bandwidth on the interface.
>
> It would all go towards the policy that has the configured default class?
>
> Is that correct?
>
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