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using "reserved" IPv6 space
- Subject: using "reserved" IPv6 space
- From: matt.addison at lists.evilgeni.us (Matt Addison)
- Date: Tue, 17 Jul 2012 07:18:28 -0400
- In-reply-to: <1342509300.6281.198.camel@karl>
- References: <CC29A9B4.8578D%[email protected]> <2059648.BTFFAkdkz4@lsdsrv> <4742592599634568524@unknownmsgid> <1342500058.6281.154.camel@karl> <[email protected]> <1342509300.6281.198.camel@karl>
On Jul 17, 2012, at 3:15, Karl Auer <kauer at biplane.com.au> wrote:
> Reading it with a squint: The phrase "packets [...] will be delivered to
> one router on the subnet" does not specifically exclude the possibility
> that packets will be delivered to more than one router on the subnet.
> Still, I do think it would be a little unreasonable to interpret it
> thus.
After reading some more I see how using subnet-router anycast works.
The anycast address is global in scope so the end host will only learn
1 potential next hop at a time (the routers randomize a delay when
responding to ND for a subnet-router anycast), and perform NUD as
needed to determine if their current router is up or down (RFC4861).
So you can get failover with no FHRP by using subnet-router anycast.
You just won't get sub-second failover.