[j-nsp] IPv6 and ISIS

[Mark Tinka]

On Wednesday, August 03, 2011 11:40:26 AM tim tiriche wrote:

> Do you normally run mult itopology or single topology for
> isis when deploying dual stack?
> Any recommendations and why chose one over the other.

We're a multi-topology house, and turn it on by default with 
every new device we add to the network.

It's very useful because the reality is that when operators 
are turning up v6 across the network, there is a period 
through which the IS-IS topologies are not congruent, i.e., 
one is v4 while another v4 + v6. 

Because of this, single topology on one side and multi-
topology on another won't work. Similarly, dual-stack on one 
side and v4 only on the other side won't work either.

This is especially important in multi-vendor environments, 
where Cisco IOS, for example, do not enable both IS-ISv6 
when IS-IS is enabled; this is unlike Junos, which enables 
both IS-IS for v4 and v6 when IS-IS is enabled.

Unless you plan to shutdown your entire network, configure 
dual-stack everywhere and then boot it all back up at once, 
go MT :-). It certainly won't hurt.

> For MPLS TE, do you create additional lsp's for v6 or
> just do 6PE?

We just got dual-stack, and avoid 6PE altogether.

Mark.
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