that's great, thank you for the example, but how does that differ from a 10b setup? From RFC4364, 10a sounds like it simply trade BGP routes between AS's whereas 10b is more private arrangement just between two providers.
As harry states option B is far by more scalable tha having to configure back to back vrfs on subinterfaces. Option B is my choice within my old companies network. You have 2 options as to how you get the ASBR PE to actually hold the routing table for the vrf. 1. You can use the command no bgp default route-target filter which will make the ASBR hold every single vrf that is created on your network (a bit like your route reflector) OR you can just create the vrf on the ASB with only a RT import command. personally again I use the RT import as i dont see any point whatsoever for this ASBR to hold the routing tables of every vrf in the network when its not going to do anything with about 90% of them.
that answered my question perfectly, thanks. I found my MPLS Architectures book (Cisco Press) the other afternoon, and couldn't find a single discussion on 10a and 10b until I really read the section on InterProvider communications. I had to read it 3 times and re-read RFC 4364 before I latched onto 10b, I've just never seen the actual commands to do it.
But, I don't now from your discussion, makes sense.
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