On Sunday, February 27, 2011 08:04:04 am David water wrote: > Any good documentation on NSR or GRES that some one can > point me to?
GRES would be more appropriate on the 'j-nsp' mailing list, as that's Juniper terminology. The equivalent on the Cisco side is SSO. > I am looking for the functionality and > design recommendation? It mostly comes down to protocol support and maturity. Graceful Restart (what Cisco call NSF) has greater protocol support and is generally considered more mature. However, it requires co-ordination with other routers in the network (different modes for those with only one control plane and those with two) and is a little slower compared to NSR. NSR has generally lagged behind re: protocol support, but this has been changing in the last 18 months or so, and most major protocols should now be supported. You'll probably find more networks running Graceful Restart rather than NSR, but I'm sure NSR take-up is mounting. NSR makes more sense if you're looking for more hitless failovers (it's faster since state is active across both control planes). But some vendors have had strange bugs when NSR is deployed. YMMV. Test, test, test. One of the fears in the past was that whatever caused the primary control plane to fail would propagate to the secondary one during a switchover, causing it to fail as well, when NSR is used. I'm not sure how relevant that still is today - we've mostly been a Graceful Restart shop here. > What IGP timer should I use with > it? OSPF Fast hello will work with NSR and GRES? Try BFD, along with Graceful Restart or NSF, depending on what your platform supports. Cheers, Mark.
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