[j-nsp] ISIS Routing Problem

[Felix Schueren]

Eric,

> As for the L1 route preference, that's what I don't understand.  If
> R1/R2 are getting each other's loopbacks through L2 with a preference
> of 18, but then I swap the L1/L2 preferences so that L2 now has a
> pref of 15, why would the L1 route always get preferred?

IS-IS always prefers routes reachable via L1 over those reachable via 
L2, and in this case the IS-IS route selection will only ever export the 
L1 version of the route to the main junos kernel, and _after_ the IS-IS 
decision (use L1 over L2) was made junos will apply the global route 
preference mapping, then put the IS-IS route into it's routing tables.

Kind regards,

Felix

-- 
Felix Schüren
Head of Network

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