Re: Looking for information on IGP choices in dual-stack networks

[Robert Drake <rdrake () direcpath com>]

On 6/9/2015 11:14 AM, Victor Kuarsingh wrote:
> We are looking particularly at combinations of the following IGPs: 
> IS-IS, OSPFv2, OSPFv3, EIGRP.
> If you run something else (RIP?) then we would also like to hear about 
> this, though we will likely document these differently. [We suspect 
> you run RIP/RIPng only at the edge for special situations, but feel 
> free to correct us]. 

When we first were moving to IPv6 in the core network we evaluated IS-IS 
because it was what we were using for IPv4 and we would have preferred 
to run a single protocol for both.  We had problems with running a mix 
of routers where some supported IPv6 and others did not.  From what I 
recall, if any router did not support IPv6 then it wouldn't connect to a 
router running v6 and v4.

It's possible these were bugs and they were worked out later or just a 
messed up design in the lab, but we also like the idea of keeping IPv4 
and IPv6 away from each other so if one is broken the other one might 
still work.

So we use OSPFv3 for IPv6 routing and IS-IS for IPv4 routing.