[c-nsp] IOS XR PIC (+ multipath)

[Oliver Boehmer (oboehmer)]

Adam,


>
>More specifically with the new CLI for the feature in 4.2 :
>
>route-policy RP-PIC
>  set path-selection backup 1 install
>end-policy
>!
>router bgp 123
> address-family vpnv4 unicast
>  additional-paths selection route-policy RP-PIC
>
>
>I'm more interested in the advanced multipath/primary-backup
>implementation:
>
>-so for equal cost paths I'll have the balancing in place
>-and for unequal cost paths I'll have the PIC in place

well, no. For equal-cost, you also have PIC in place, but as the router
already has two (or more) path installed and active in the FIB, it doesn't
need to install a backup path. so that's PIC-like behaviour, without any
config. The config ...

>
>route-policy RP-PIC
>  set path-selection backup 1 install multipath-protect
>end-policy

... also causes the PE to install a backup path even for those cases. I
can't think of a scenario where this is needed, but I might be missing
something.

	oli