[j-nsp] l3vpn

[Pedro Roque Marques]

Alexander Arsenyev (GU/ETL) wrote:
> This probably will work but let me recall what the original question was -
> "Can we configure multiple vrfs for a single interface?"
> The config below implies that interface on [pe] facing [aggr] is in routing-instance "aggr", or, in other words,
> single vrf named "aggr" is assigned to the interface on [pe] which faces [aggr].
> So the answer I guess would be "single interface could have only 1 VRF assigned but there
> are workarounds for the specific circumstances".

I sort of disagree w/ the "workaround" comment.

If one considers a routing-instance to imply a particular destination 
lookup table, then by definition a logical interface has a single 
destination lookup table.

For applications where you want "split" particular patterns of traffic 
into different table lookups this is achieved via a classification stage 
before the destination table lookup.

So, i'd argue that the answer to your question is that the concept of an 
interface in multiple vrfs doesn't really exist. Or at least i don't 
understand it.

You can build a lot of applications on top of JunOS if you understand 
what the basic building blocks are. A "routing-instance" is a collection 
of resources that implies both a set of control routing tables and a 
given forwarding path.

   Pedro.