[c-nsp] OSPF to ISIS migartion

[Alan Buxey]

Hi,

> as others have shared, vijay's presentation and methodology were spot on:
>   - have ALL of your configurations pre-written/staged/tested
>   - have a well organised plan of what order you will touch
> everything that is being converted,
>       or clear boundaries if you have to do it in stages so that
> nothing is missed
>   - execute the plan
>   - verify the config on every device that was supposed to be touched

I'd agree. plan in advance. prepare the config. 
enable and configure the ISIS, ensure that everything is using it,
lower the OSPF priority so ISIS takes over. check everything is
all okay. turn OSPF off. done.

alan