[c-nsp] Not redistributing certain eBGP routes into mpBGP

[Oliver Boehmer (oboehmer)]

Pshem Kowalczyk <> wrote on Wednesday, March 19, 2008 1:59 AM:

> Hi,
> 
> We have a situation where one of the PEs (6500, call it PE1) have
> multiple interfaces towards the same customer. The customer has a few
> other sites connected to different PEs. A few of the networks visible
> on PE1 in their vrf should only be visible to customer devices
> connected to that PE. We run eBGP with them so atm the redistribution
> happens automatically.
> 
> I tried to use an export map and remove the route-target exports all
> together. The route-map specified uses a prefix list to figure out
> what RT should be used, like this:
> 
> route-map EXPORT-FROM-VRF4112 permit 10
>  description All sites routes
>  match ip address prefix-list PREFIX-CUST4112-ALL-SITES
>  set extcommunity rt  xxy:4112
> 
> (the defaut RT for this customer is 4112)
> 
> but on our route servers I can still see the other prefixes, but
> without the RT at all! Of course they don't get inserted anyway.
> Is that supposed to work,  did I got it wrong, or is it a bug?

This is expected. If you remove any "route-target export" from the VRF
definition, you control RT tagging using route-maps alone. Prefixes not
carrying a RT will be sent towards the RR and towards other PEs, but the
other PEs will drop the updates due to their RT filter.

	oli