[c-nsp] Maximum traffic on Gigabit Ethernet

[Nick Hilliard]

On 04/10/2011 07:38, Manaf Al Oqlah wrote:
> Normal Configuration:
> 
> interface GigabitEthernet5/2
> ip address x.x.x.x
> no ip redirects
> no ip proxy-arp
> media-type rj45
> 
> MTU is default 1500

The GE ports on a VS-S720-10G-3C supervisor are each provisioned with 9.6MB
RX and 8.1MB TX buffers.  This is quite a respectable amount of buffer
space for a GE port, although if you have mls qos enabled, the default TX
configuration is 1p3q4t, configured as:

SP: 1.2MB
Q3: 1.2MB
Q2: 1.6MB
Q1: 4.1MB

This may not suit your traffic profile if everything is in a default
priority class, as you'll end up putting everything into q1.

reference paper:

> http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper09186a0080131086.html

Nick