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diff --git a/doc/main.texi b/doc/main.texi index a6bf0d1c..810866aa 100644 --- a/doc/main.texi +++ b/doc/main.texi @@ -10,6 +10,7 @@ different routing protocols. * Invoking zebra:: Running the program * Interface Commands:: Commands for zebra interfaces * Static Route Commands:: Commands for adding static routes +* Multicast RIB Commands:: Commands for controlling MRIB behavior * zebra Route Filtering:: Commands for zebra route filtering * zebra FIB push interface:: Interface to optional FPM component * zebra Terminal Mode Commands:: Commands for zebra's VTY @@ -185,6 +186,81 @@ and later). After setting @var{tableno} with this command, static routes defined after this are added to the specified table. @end deffn +@node Multicast RIB Commands +@section Multicast RIB Commands + +The Multicast RIB provides a separate table of unicast destinations which +is used for Multicast Reverse Path Forwarding decisions. It is used with +a multicast source's IP address, hence contains not multicast group +addresses but unicast addresses. + +This table is fully separate from the default unicast table. However, +RPF lookup can include the unicast table. + +WARNING: RPF lookup results are non-responsive in this version of Quagga, +i.e. multicast routing does not actively react to changes in underlying +unicast topology! + +@deffn Command {ip multicast rpf-lookup-mode @var{mode}} {} +@deffnx Command {no ip multicast rpf-lookup-mode [@var{mode}]} {} + +@var{mode} sets the method used to perform RPF lookups. Supported modes: + +@table @samp +@item urib-only +Performs the lookup on the Unicast RIB. The Multicast RIB is never used. +@item mrib-only +Performs the lookup on the Multicast RIB. The Unicast RIB is never used. +@item mrib-then-urib +Tries to perform the lookup on the Multicast RIB. If any route is found, +that route is used. Otherwise, the Unicast RIB is tried. +@item lower-distance +Performs a lookup on the Multicast RIB and Unicast RIB each. The result +with the lower administrative distance is used; if they're equal, the +Multicast RIB takes precedence. +@item longer-prefix +Performs a lookup on the Multicast RIB and Unicast RIB each. The result +with the longer prefix length is used; if they're equal, the +Multicast RIB takes precedence. +@end table + +WARNING: Unreachable routes do not receive special treatment and do not +cause fallback to a second lookup. +@end deffn + +@deffn Command {show ip rpf @var{addr}} {} + +Performs a Multicast RPF lookup, as configured with +@command{ip multicast rpf-lookup-mode @var{mode}}. @var{addr} specifies +the multicast source address to look up. + +@example +> show ip rpf 192.0.2.1 +Routing entry for 192.0.2.0/24 using Unicast RIB + Known via "kernel", distance 0, metric 0, best + * 198.51.100.1, via eth0 +@end example + +Indicates that a multicast source lookup for 192.0.2.1 would use an +Unicast RIB entry for 192.0.2.0/24 with a gateway of 198.51.100.1. +@end deffn + +@deffn Command {show ip rpf} {} + +Prints the entire Multicast RIB. Note that this is independent of the +configured RPF lookup mode, the Multicast RIB may be printed yet not +used at all. +@end deffn + +@deffn Command {ip mroute @var{prefix} @var{nexthop} [@var{distance}]} {} +@deffnx Command {no ip mroute @var{prefix} @var{nexthop} [@var{distance}]} {} + +Adds a static route entry to the Multicast RIB. This performs exactly as +the @command{ip route} command, except that it inserts the route in the +Multicast RIB instead of the Unicast RIB. +@end deffn + + @node zebra Route Filtering @section zebra Route Filtering Zebra supports @command{prefix-list} and @command{route-map} to match |