From: Pierre-Alex (paguanel@hotmail.com)
Date: Sun Jun 04 2006 - 06:38:28 ART
I need a quick "yes" or "no" + quick optional comments on the following points
.
Theses are deductions I have made from several readings on CCO and research in
the group-study archives.
I just want to make sure I am not inventing wrong rules here ...
1. QoS bandwidth usage is calculated based on L3 packet size.
2. On non-7500 + platforms: 25% of the interface bandwidth SHOULD be left
aside for overhead traffic, including Layer 2 (frame? overhead), control
traffic (routing,cdp,snmp etc ...), and best-effort traffic. This traffic, and
in particular NON IP traffic, will be allocated to the DEFAULT-CLASS .
Because the 25% is a recommendation and is NOT enforced by the routers when
using absolute bandwidth values. Nothing prevents me from doing the following
and starve my overhead traffic.
interface s 0/0
bandwidth 100
policy a
class 1
bandwidh 90
class 2
banwith 10
clas-class default
3. The command "maximum bandwith-percent xx" is only releavant when using
configurations with "bandwidth percent" .
When left to the default maximum bandwith-percent 75 of interface bandwidth
and when using "bandwidth percent " type configurations, then the overhead is
taken care off.
When changed to maximum bandwith-percent 100 then care must be taken to leave
enough in the default class for overhead traffic.
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