Reliable lan service

Shannon McFarland shmcfarl at cisco.com
Thu Apr 14 16:19:36 CEST 2005


> Date: Thu, 14 Apr 2005 11:50:14 +0200
> From: Daniel Roesen <dr at cluenet.de>
> Subject: Re: Reliable lan service
> To: ipv6-ops at lists.cluenet.de
> Message-ID: <20050414095014.GA31383 at srv01.cluenet.de>
> Content-Type: text/plain; charset=us-ascii
> 
> On Thu, Apr 14, 2005 at 10:19:35AM +0100, Colin Whittaker wrote:
>> Hello all, AS1213 here.
> 
> Hi Colin, nice to see you joined! Let Dave know too. ;)
> 
>> All my googling has failed to turn up any recomendations for doing
>> hsrp/vrrp with ipv6 except for a ietf draft from 2003.
>> 
>> Has anyone else found a good solution to this.
> 
> Unfortunately not. I know of no vendor who have implemented VRRPv6
> yet. As far as I can see, best (only) thing you can do now is use
> Router Advertisements with very short timers to announce default
> routes to your hosts. You can limit RAs to just providing default,
> not advertising stateless autoconfig capability if you don't want your
> servers to do that.
We (Cisco) have HSRP for IPv6 and will soon release under Early Field
Trials.  Get a hold of your Cisco contact and they can get you signed up for
the EFT.

Daniel is correct that today you can lower your RA (ipv6 nd reachable-time
<time in msec>) to trigger faster response from NUD on the client/server.
Without HSRP/VRRP/GLBP functionality for IPv6 a host would still failover to
a secondary router (via default-gateway entries learned from RAs) within 30
seconds based on traditional NUD activity.  Lowering the reachable-time
value to something like 5000 msec would allow a client/server to flush the
dead neighbor (primary GW) and use the secondary GW within 5 seconds.

If you are interested in more info on the reachable-time operation then
unicast an email to me.

Again, all of this is a useless function once you have a full-scale FHRP
running like HSRP.  It is nice to know that there is redundancy functions
built into the basic stack for IPv6 though. ;-)
> 
> Let's see what other folks here come up with... it's certainly an
> interesting question.
> 
> 
> Best regards,
> Daniel
> 
> -- 
> CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0
> 




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