[c-nsp] Conditional BGP

[Terry Baranski]

On Sun, Oct 19, 2008 at 10:46:31PM, Matt Carter wrote:

> the main problem i've seen with this is that a lot of 
> providers are going to local pref their downstreams such that 
> they are not using provider/peer links for traffic going to 
> directly connected customers. given local pref beats as path 
> length, you are likely going to get traffic bleeding over to 
> your DR site from ISP A/B local networks..

Indeed -- you have to work with each provider to make sure you know what
they're doing.  In addition to prepending we also advertised a local-pref
community to each peer so that they set the desired local-pref upon
receiving a given route from us.

-Terry