IPv6: IS-IS or OSPFv3

Glen Kent glen.kent at gmail.com
Mon Dec 29 23:53:50 UTC 2008

There is no fundamental difference between ISIS and OSPF; it's all in
details and style. You might want to look at:



On Sat, Dec 27, 2008 at 8:17 AM, devang patel <devangnp at gmail.com> wrote:
> Hello,
> I do have some confusion about which one is better for IPv6 in Service
> Provider networks as far as IP routing and MPLS application is concern!
> 1. Which protocol should i use to support the IPv6 in network: ISIS or
> OSPFv3?
>    As ISIS has multi-topology feature that can give us capability to run
> IPv4 network separate from IPv6 right! and same thing with OSPF: OSPFv2 will
> be used for IPv4 routing and OSPFv3 will be used for IPv6 routing! again Its
> look like resource    utilization for both the protocol will be same as they
> are going to use separate database for storing the routing or topology
> information. ISIS still has advantage over OSPF as it does use the TLV
> structure which can help in expanding network to support the new feature!
> 2. MPLS is not distributing label for IPv6 protocol so again there will not
> be any IGP best path calcuated for any MPLS related application for IPv6!
> 3. what if i have already running OSPFv2 for IPv4 in the network then should
> i think for migrating to ISIS?
>   if yes then what are the advantages that I can look at for migrating my
> network to IS-IS?
> regards
> Devang Patel

More information about the NANOG mailing list