Re: using "reserved" IPv6 space

["Rajendra Chayapathi (rchayapa)" <rchayapa () cisco com>]

True .. Your point of the ICMPv6 storm is on mark and is one of the
drawbacks for this solution.

On 7/16/12 12:39 PM, "Oliver" <olipro () 8 c 9 b 0 7 4 0 1 0 0 2 ip6 arpa>
wrote:

> On Monday 16 July 2012 18:26:08 Rajendra Chayapathi wrote:
> > On the HSRP/ND part , this all falls in the First Hop redundancy areana
> > and can be achieved via any of the following and each has its merits and
> > cons..
> >
> > 1) Using ND -- need to tune the "IPv6 nd reachable time" to achieve the
> > faster failover
> > 2) Using any of the First hop redundancy protocol ( HSRP, VRRP , GLBP)
> > 3) Default route selection.
>
> In all honesty, I think using ND as the failover method is a generally
> bad 
> idea - you have no way of ensuring all endpoints take note of or honour
> the 
> router preference flag.
>
> Additionally, having a 1 second validity lifetime is going to create a
> lot of 
> ICMPv6 spam across the segment - big deal? perhaps not. But when
> contrasted 
> with the fact that it can be wholly avoided using one of the
> aforementioned 
> redundancy protocols, why would you do it?
>
> Additionally, as an alternative to RAs, you can simply point default at
> the 
> all-routers anycast address.
>
> Regards,
> Oliver