Re: [nsp] QoS for a particular set of flows over a DS3...

From: Niels Bakker (niels@euro.net)
Date: Thu Dec 23 1999 - 17:18:21 EST


Andy McConnell wrote:

> On a single DS3, I need to gurantee XMbps of bandwidth for a
> particular group of packets/flows to a peer. These packets/flows
> can be identified by source and destination IP. The DS3 terminates
> on the same router (R2) as the peer:
>
> (customer)- - -(backbone)-R1-----DS3----R2----(Peer)

If you want a fixed amount of bandwidth, do the following on R1:

!
access-list 150 permit ip 1.2.3.0 0.0.0.255 any
access-list 150 permit ip host 4.3.2.1 any
!
interface Serial4/1/0
 ip address 1.2.3.4 255.255.252.0 (or ip unnumbered Loopback0, whatever)
 rate-limit output access-group 150 15000000 24000 32000 conform-action transmit exceed-action continue
 rate-limit output 20000000 24000 32000 conform-action transmit exceed-action drop
 ip route-cache distributed
!

This reserves 15 Mbps for anything in ACL 150. Don't use this on a
VIP2-40 if the total port speed of all adapters in it exceeds 45 Mbps,
or if you're not using dCEF (which this won't work without).

If you only want DiffServ-style priority queuing, follow the suggestions
by other posters.

        -- Niels.



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