The MuRIB is still created and used for RPF but the legacy RPF rules apply so the table is filled in a way to be compatible with those rules.
2- Multicast MTR is configured
By default only directly connected routes and routes from multicast protocols (static, mBGP, mIGPs) will be installed in the MuRIB. You can also import unicast routes from any configured topology or even configure which topology you want to use for RPF (bypass the MuRIB in this case).
Longest-match rule applies by default.
So main advantages are:
- Single place where we have all the routes we want to use for RPF
-> single lookup vs several with the legacy implementation.
- Easier to implement non-congruent multicast topologies.
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