[c-nsp] SSO with ISIS NSF (IETF vs Cisco)

[Ken Weissner (kweissne)]

Hello,
 
I've just joined this list, so didnt have a copy of the original email
to reply to, which was forwarded by a colleague.
 
>My observation is that Cisco mode is faster then IETF, in fact IETF
has as delay as being in RPR+ mode?
>Is IETF a GR? vs Cisco a SSO?
 
 
 
There should be no difference in length of outage if both these modes
are functioning properly.
IETF is GR mode, ie RFC3847.   "Cisco" mode is a "Non-Stop Routing" mode
that doesnt require
interaction with the peer to recover from the processor failure due to
the transfer of all state information to the standby.
 
A "RPR+" like delay could be that the peer to the switching over router
doesnt have helper capability.
 
Thanks,
Ken Weissner