Presentation on theme: "VA-auto Goal: make the VA configuration simpler –Dont need to make configures on all VA routers. Only APRs and partial ASBRs. –Dont need to change the."— Presentation transcript:
VA-auto Goal: make the VA configuration simpler –Dont need to make configures on all VA routers. Only APRs and partial ASBRs. –Dont 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 –Dont 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, eventually 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 customer 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 dont 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.