From: Kevin Tang (Kevin.Tang@telecom.co.nz)
Date: Wed Jul 09 2003 - 21:30:15 GMT-3
Here is the information from CCO. It looks like you should not config max-reserved-bandwidth 100% for the interface. Otherwise best-effort and control traffic will have 0% bandwidth which may effect the network connectivity.
Do not know why Cisco choose 25% as default for overhead here. Why not choose 30% or 10%?
========
Usage Guidelines
The sum of all bandwidth allocation on an interface should not exceed 75 percent of the available bandwidth on an interface. The remaining 25 percent of bandwidth is used for overhead, including Layer 2 overhead, control traffic, and best-effort traffic.
If you need to allocate more than 75 percent for RSVP, CBWFQ, LLQ, IP RTP Priority, Frame Relay IP RTP Priority, and Frame Relay PIPQ, you can use the max-reserved-bandwidth command. The percent argument specifies the maximum percentage of the total interface bandwidth that can be used.
If you do use the max-reserved-bandwidth command, make sure that not too much bandwidth is taken away from best-effort and control traffic.
The max-reserved-bandwidth command is intended for use on main interfaces only; it has no effect on virtual circuits (VCs) or ATM permanent virtual circuits (PVCs).
-----Original Message-----
From: ccie2be4 [mailto:ccie2be4@myrealbox.com]
Sent: Wednesday, 9 July 2003 23:45
To: ccielab@groupstudy.com
Subject: Re: need Qos Guru help
I think that there are 2 method by which u can solve
a) maximum reserver 90.. then also the rest of the traffic will go through
the left 10%
Or
b) you can resever 100% and in class-default assing 10% bandwidht to it,
Now i am not clear which is better answer
param
----- Original Message -----
From: "love cisco" <love_cisco@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, July 09, 2003 3:26 PM
Subject: need Qos Guru help
> I have a CBWFQ question here. I searched CCO. But could not find any
useful
> information.
>
> For a link, www need 35% bandwidth, ftp need 40% bandwidth, telnet need
15%
> bandwidth. Other traffic use rest of the bandwidth.
>
> By default, the max-reserved bandwidth is 75%. If I change the
max-reserved
> bandwidth to 100%, Is that means no bandwidth available for routing
> protocol or the routing protocol will be treated as !0other traffic!1 and
> use rest of the 10% bandwidth?
>
> Any idea?
>
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