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OSPF and IS IS

  • From: "Sunil Menon K" <k_sunilmenon@rediffmail.com>
  • Date: 23 Jan 2004 07:31:49 -0000
  • Cc: mpls-ops@mplsrc.com
  • Resent-Date: Fri, 23 Jan 2004 03:05:07 -0500
  • To: "Eric Osborne" <eosborne@cisco.com>

Hi all
I work for a large ISP  which currently has OSPF for IGP,running MPLS VPN and are headed for implementing QOS and Traffic Engineering and moving towards migrating to IPV6 and becoming a Tier 1 ISP.Since most Tier 1 ISPs are running IS IS as their IGP,I have been working on looking at IS IS in relation to OSPF to deciede if IS IS holds any significant advantages keeping mind two key aspects of convergence,scalability and support as the network grows.I have a few questions with regards to the same.

1.Does IS IS have the flexibility of supporting both v4 and V6 implementations?Is the same available with OSPFv2 aswell?
2.Does IS IS hold an edge over OSPF in anyway for Traffic Engineering implementations?
3.With regards to the basic routing functionality ....can it be safely said of IS IS as being more scalable with its support for larger areas and a more strict hierarchy model?
4.What in your opinion are the key benefits would a Tier 1 ISP stand to
derieve from IS IS implementation of the two level hierarchial Link 
state protocol.

Any inputs and guidance on the same would be highly appriciated.

Thanks and Regards,
Sunil.