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doc: Document rpf-lookup-mode changes

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Signed-off-by: Nathan Bahr <nbahr@atcorp.com>
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Nathan Bahr 2024-10-30 21:33:09 +00:00
parent 590c937e8a
commit f75ec46dfb
1 changed files with 13 additions and 1 deletions
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doc/user/pim.rst
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@ -217,7 +217,7 @@ PIM Routers
never do SM over. This command is vrf aware, to configure for a vrf, specify never do SM over. This command is vrf aware, to configure for a vrf, specify
the vrf in the router pim block. the vrf in the router pim block.
.. clicmd:: rpf-lookup-mode MODE .. clicmd:: rpf-lookup-mode MODE [group-list PREFIX_LIST] [source-list PREFIX_LIST]
MODE sets the method used to perform RPF lookups. Supported modes: MODE sets the method used to perform RPF lookups. Supported modes:
@ -246,6 +246,18 @@ PIM Routers
configured to make the configuration immune against possible changes in configured to make the configuration immune against possible changes in
what the default behavior is. what the default behavior is.
If a group and/or source prefix list is provided, then the RPF lookup mode
will only apply to source, group addresses that match the given prefix list(s).
Not all RPF lookups have a valid group address when performing a lookup, e.g. RPF
to an RP only does a lookup to the RP address and has no specific group.
Lookups that do not have a specific group will only use lookup modes that do not
specify a group-list.
A global rpf lookup mode that does not have a group or source list is always installed
and, as documented above, uses the ``mrib-then-urib`` mode by default.
This can be changed with an rpf-lookup-mode MODE that does not specify group or source lists.
There can be any number of rpf lookup modes, as long as the combination of group and source
list is unique.
.. warning:: .. warning::
Unreachable routes do not receive special treatment and do not cause Unreachable routes do not receive special treatment and do not cause