VA-auto

• Goal: make the VA configuration simpler – Don’t need to make configures on all VA routers.

• Only APRs and partial ASBRs.

– Don’t need to change the configurations on all VA routers when the VPs change. (e.g., VP add/del/split/merge).

• VP-range vs VP-list

– Don’t need to make much configuration on all VA routers.

• Configure pop-prefix-list on partial ASBRs.

How to know what to FIB-install?

• Configure ASBRs which are connected to peer ASes or provider ASes with “VP-range”– VP-range: ranges of addresses covered by all configured VPs, e

ventually a single 0/0 entry.

• Those ASBR tag routes within VP-range with “can suppress” tag– Non-transitive Extended Community Attribute.– Exception: VP routes are never tagged.– May also not tag other routes according to policy, for instance cu

stomer routes, high-volume routes.

Selective FIB Installation

• APRs must FIB-install sub-prefixes within their own corresponding VPs regardless of the “can-suppress” tag.

– Non-APRs don’t need to FIB-install the sub-prefixes with “can-suppress” tag.

– All routers need to FIB-install the prefixes without the “can-suppress” tag as normal. – Including VP routes, popular-prefix routes and those

routes for prefixes which are not covered by the VPs.

Next Step

• Last call for an informational RFC?