From e48808692b6db3f1d7d31139eb22030228ba6fb7 Mon Sep 17 00:00:00 2001 From: Joachim Wiberg Date: Wed, 16 Mar 2022 10:02:57 +0100 Subject: [PATCH] man: bridge: document per-port mcast_router settings Signed-off-by: Joachim Wiberg --- man/man8/bridge.8 | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 index 93852ed82..2fa4f3d69 100644 --- a/man/man8/bridge.8 +++ b/man/man8/bridge.8 @@ -47,6 +47,8 @@ bridge \- show / manipulate bridge addresses and devices .BR hwmode " { " vepa " | " veb " } ] [ " .BR bcast_flood " { " on " | " off " } ] [ " .BR mcast_flood " { " on " | " off " } ] [ " +.BR mcast_router +.IR MULTICAST_ROUTER " ] [" .BR mcast_to_unicast " { " on " | " off " } ] [ " .BR neigh_suppress " { " on " | " off " } ] [ " .BR vlan_tunnel " { " on " | " off " } ] [ " @@ -473,6 +475,19 @@ By default this flag is on. Controls whether multicast traffic for which there is no MDB entry will be flooded towards this given port. By default this flag is on. +.TP +.BI mcast_router " MULTICAST_ROUTER " +This flag is almost the same as the per-VLAN flag, see below, except its +value can only be set in the range 0-2. The default is +.B 1 +where the bridge figures out automatically where an IGMP/MLD querier, +MRDISC capable device, or PIM router, is located. Setting this flag to +.B 2 +is useful in cases where the multicast router does not indicate its +presence in any meaningful way (e.g. older versions of SMCRoute, or +mrouted), or when there is a need for forwarding both known and unknown +IP multicast to a secondary/backup router. + .TP .BR "mcast_to_unicast on " or " mcast_to_unicast off " Controls whether a given port will replicate packets using unicast -- 2.47.2