[c-nsp] ISIS Fast Convergence (ASR920?)

[Jason Lixfeld]

Hey,

There seem to be some conflicting suggestions for ISIS fast convergence timers, and I can’t seem to understand why that would be.  The former example is ISIS in a LFA FRR environment, the latter is from a general best practise guide. I can’t imagine LFA FRR or not would matter to the best practise would it?

ASR920 + LFA FRR[1]:

spf-interval 5 50 200 
prc-interval 5 50 200 
lsp-gen-interval 5 50 200


IE: XE 16.5 (Everest) (which can also run on an ASR920)[2]:

spf-interval 5 1 50
prc-interval 5 1 50
lsp-gen-interval 5 1 50

[1]
https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/iproute/iri-xe-3s-asr920-book/iri-lfa-frr.html#topic_52D77326BEE440AA8008C628B124B29B

[2]
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/xe-16-5/irs-xe-16-5-book/irs-fscbp.html#GUID-28C3A788-5CD8-45ED-909F-1B5A54140B46