RE:[isp-bgp] BGP & Policy Routing

["Ejay Hire" <ejayhire@...>]

Hello.

Policy routing is the correct tool for the job.  The most common mistake is 
specifying the next-hop interface instead of the address.  Specifying the 
interface only works if no other route is found to the destination.

EX.
serial 1/0 is connected to the "better" isp with the ip of 172.16.0.2/30  
(so .1 is the far side.)
ethernet 0/0 is connected to the internal network, and we're policy routing 
10.0/8 to serial 1/0.

access-list 101 permit ip 10.0.0.0 0.255.255.255 any

route-map to-special-isp
match ip address 101
set ip next-hop 172.16.0.1

interface ethernet 0/0
description Connected to internal network
ip policy route-map to-special-isp

Let me know if I can help.

Ejay Hire
EjayHire@...

> Subject: BGP & Policy Routing
> From: Chris Davies <isp@...>
> Date: Thu, 01 Sep 2005 13:09:32 -0400
> X-Message-Number: 1
>
> I take defaults from two providers as the router I have cannot handle
> full routes.  I have inbound ASpadding working properly, but, would like
> to direct traffic a little differently for one of my /22 blocks to add a
> 'Quality of Service' benefit.  I've tried everything with policy
> routing, but, no matter what, showing the policy reports that it is in
> use, but, no packets are counted and routing is not adjusted.
>
> How do I take all traffic originating from my one /22 block and default
> it out the secondary provider?  I know that route-maps actually are
> filtering the inbound and outbound announcements, but, I need to check
> what the source IP is and decide to throw it out my secondary connection.
>
> I've checked policy maps, route maps, I thought perhaps with communities
> I could reset the next-hop, but, nothing appears to make a dent in it
> and everything defaults out the primary provider.  Of course, in the
> event of a failure of the secondary provider, I would like the
> connection to failover to the first.
>
> Cisco 3560
> IOS 12.2(20)EX
>
> Any hints or pointers in the right direction would be appreciated.  Thanks.
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