[c-nsp] bgp transit, selecting providers based on source IP

[Michael K. Smith - Adhost]

Hello All:

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Bruce Pinsky
> Sent: Tuesday, March 25, 2008 3:54 PM
> To: Wayne Lee
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] bgp transit, selecting providers based on source
> IP
> 
> * PGP Signed by an unverified key: 03/25/08 at 15:54:12
> 
> Wayne Lee wrote:
> > Hi List
> >
> > We currently have 3 transit providers. all works as expected. We
> > recently have connected a customer who requires BGP transit from us
> > but with a twist.
> >
> > The customer for whatever reason do not want their traffic going via
> > our preferred provider, is there any way I can force the customers
> > outbound traffic to go via my other 2 providers instead?
> >
> > I have created the prefix-lists to stop announcing the customers
> > routes via the main provider so no traffic should return by them. The
> > customer is multi-homed with another transit provider.
> >
> >
> 
> You could either use Policy Based Routing to forward based on their
> source
> address range or you could use VRF-Lite to create a separate routing
> table
> instance that only includes the routes to 2 out of the 3 providers.
> 
> Which is best would require a bit more info about your environment.
> 

The answer to this may be "no way".  :-)  If you have a peering session with the customer, why not only announce your routes from your two other providers so that the customer doesn't see the routes from the one they want to avoid?  Wouldn't that accomplish the same thing?  You could tag your transit routes with a community, add the two you want to transit to a community-list and then announce only the routes that match the list.

Thinking out loud, but not necessarily well.  :-)

Mike
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 475 bytes
Desc: not available
Url : https://puck.nether.net/pipermail/cisco-nsp/attachments/20080326/3333c815/attachment.bin