[c-nsp] OSPF to ISIS migartion

David Freedman david.freedman at uk.clara.net
Wed Sep 23 07:49:11 EDT 2009

jack daniels wrote:
> Hi all ,
> I have got a project for an ISP ( also LDP configured ) runnning OSPF to
> migrate to IS-IS.

Please make sure you understand your reasons for doing so clearly before
you get started with this, examples:

Good reasons:

 - Want to completely re-engineer the IGP nondisruptively (leverage

 - Want to merge with another IS-IS network which can't migrate to OSPF

Bad reasons:

 - Want to switch on LDP but don't want loads of FECS (bad: use
advertise filter)

 - Want to move to IPv6 (bad, try OSPFv3)

 - Our new-guy only understands IS-IS (bad: get a new new-guy)



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