Hi Aijun, > > There are two scenarios as introduced by Gyan: one is the node > failure(Scenario 1), and another is the link failure(Scenario 2). > > For scenario 1, also when all ABRs can’t reach the specified address, it is > not efficient to advertise all of other detail prefixes when only one prefix > or some prefixes are missing. The ABRs tell exactly the specified failure > prefixes via PUA message is reasonable.
If no ABR can reach the address, then there is no point in advertising anything. The traffic is going to black hole. > For scenarios 2, because the specified prefixes can be accessed via another > ABR, then we can let this ABR to advertise the details prefixes information > for the specified address, which behavior is similar with RIFT, as also > mentioned in the presentation materials. Agreed. So, why do we need to punch a hole? Tony _______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
