> From: Jeroen Massar > Sent: Thursday, October 21, 2010 9:57 AM > To: Allen Smith > Cc: NANOG list > Subject: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 — > Unique local addresses) > > [Oh wow, that subject field, so handy to indicate a topic change! ;) ] > > Short answer: you announce both PA prefixes using Router Advertisement > (RA) inside the network. You pull the RA when a uplink goes > down/breaks.
That assumes importing some sort of routing state into your RA config. Sort of a conditional RA. Can that be done today by anyone? > Sessions break indeed, but because there is the other prefix they fall > over to that and build up new sessions from there. This still doesn’t address breakage that happens AFTER your link to your upstream. What if your upstream has a peering issue or their peer has a peering issue? How do you detect that the distant end has a route back to that prefix but doesn't to the other? You can't.
