[c-nsp] IS-IS route separation/filtering

[Daniel Verlouw]

On Aug 5, 2009, at 9:57 PM, Jared Gillis wrote:
> Basically I'm trying to replicate the concept of an OSPF
> totally-stubby-not-so-stubby-area in IS-IS, and I'm starting to  
> question whether
> it can be done. My network design is fairly flexible at this point  
> (the only
> requirements are that it run IS-IS and L1 routers don't learn each  
> other's
> routes), so I'm open to any ideas or suggestions.

have a look at IS-IS mesh-groups. Although designed for a different  
purpose, it might work. Stick router A and all of its stub routers  
into the same L1 area. On router A, put all interfaces towards the  
stub routers in the same mesh-group.

PS. My preference would be to use BGP for the external routes and use  
IS-IS only to the distribute loopback IPs. Also makes filtering  
towards the stub routers a lot easier using route-maps etc. Depending  
on your gear/software/etc that might not be an option here though.

   --Daniel.