Fred, Add another LAN interface to Alice, connecting host Porky. If Alice didn’t advertise both ISP-Alice and ISP-Bob prefixes, Porky couldn’t use ISP Bob. It would be a quite complicated set of rules determining when Alice should or should not include ISP Bob’s prefixes on a given link. I’m quite uncomfortable tying Router Advertisement PIO’s to routing and topology changes.
I think Brian makes a good point on slide 9: https://www.ietf.org/proceedings/93/slides/slides-93-6man-6.pdf +---------------+ +———————+ | | | | | ISP-Alice | | ISP-Bob | | | | | | | | | +------+--------+ +-----+————+ | | +--+--+ +-+-+ |Alice| |Bob| +--+--+ +-+-+ | | +----+-+----------+------------+————+ | | +--+---+ +--+—+ |Spanky| |Carol| +------+ +--+———+ | +----+------------+——————————+ | +--+——+ |Alfalfa| +———+ cheers, Ole
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