IPv6: IS-IS or OSPFv3

Tue Dec 30 19:14:13 UTC 2008

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Hi,

On Dec 28, 2008, at 3:00 AM, Mark Tinka wrote:

> On Saturday 27 December 2008 09:27:05 pm Randy Bush wrote:
>
>> as one who has been burned when topologies are not
>> congruent, i gotta ask.  if i do not anticipate v4 and v6
>> having different topologies, and all my devices are
>> dual-capable, would you still recommend mt for other than
>> future-proofing?
>
> In practice, we realized that enabling IS-ISv6 on interfaces
> already running IS-ISv4 was problematic without MT pre-
> configured.
>

at least in my case, I did turned ISISv6 in one WAN interface where  
the router on the other side (a Cisco) did not have the "ipv6 unicast  
routing" general command on and the isis adjacency went down  
completely. So, yes that was an issue. But if you enabled IPv6 in both  
ends first and then one interface at the time, it worked.

I used MT to avoid IPv6 black holes during the configuration period,  
but as some boxes did not implemented it, I needed to use the  
"transition" option where IPv6 adjacencies are carried in both native  
and the MT-IPv6. Fortunately the two vendors that were lacking of MT  
support are up-to-date, however not in time as the migration ended and  
MT was removed and I left the company.

Roque.

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