[110240] in North American Network Operators' Group
Re: IPv6: IS-IS or OSPFv3
daemon@ATHENA.MIT.EDU (Roque Gagliano)
Tue Dec 30 14:15:12 2008
From: Roque Gagliano <roque@lacnic.net>
To: nanog@nanog.org
In-Reply-To: <200812281300.34387.mtinka@globaltransit.net>
Date: Tue, 30 Dec 2008 17:14:13 -0200
X-LACNIC.uy-MailScanner-From: roque@lacnic.net
Errors-To: nanog-bounces@nanog.org
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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 =20
the router on the other side (a Cisco) did not have the "ipv6 unicast =20=
routing" general command on and the isis adjacency went down =20
completely. So, yes that was an issue. But if you enabled IPv6 in both =20=
ends first and then one interface at the time, it worked.
I used MT to avoid IPv6 black holes during the configuration period, =20
but as some boxes did not implemented it, I needed to use the =20
"transition" option where IPv6 adjacencies are carried in both native =20=
and the MT-IPv6. Fortunately the two vendors that were lacking of MT =20
support are up-to-date, however not in time as the migration ended and =20=
MT was removed and I left the company.
Roque.
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