[c-nsp] ASR9K limitations

Florian Lohoff f at zz.de
Mon Aug 13 04:57:38 EDT 2012

On Sun, Aug 12, 2012 at 06:16:33PM +0200, Mark Tinka wrote:
> On Friday, June 29, 2012 07:39:06 PM Florian Lohoff wrote:
> > The only bug we have had so far was IPv6 native going
> > down on an interface when looping externally e.g. DWDM
> > transport and not getting back up until ipv6 is removed
> > from and added to the interface again. We monitor IPv6
> > interface operational state seperately since that event.
> > Reason is a failed Duplicat Adress Detection which is
> > not retried after shut/no shut or link state change.
> Hit that one too - it's an IOS XR issue, not so much an 
> ASR9000 one, as we run into it on the CRS.
> Last I heard from Cisco is that it is likely expected 
> behaviour because the RFC implies the same, i.e., DAD 
> conflicts are not cleared automatically (I'll be honest, I 
> haven't verified this claim in the RFC itself).
> That said, Cisco have a command to fix this issue 
> interactively:
> 	clear ipv6 duplicate address

I would have expected shut/no shut oder link flap to reset this. In the
end this means its a new physical connection and we should retry DAD.

Florian Lohoff                                                 f at zz.de
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