diff options
| author | Ido Schimmel <idosch@nvidia.com> | 2023-03-21 15:01:27 +0200 |
|---|---|---|
| committer | David Ahern <dsahern@kernel.org> | 2023-03-24 18:29:54 -0600 |
| commit | be24eab05d664ff63d1216498e5f2e6986ccafc7 (patch) | |
| tree | 3cab608afdcccfc6985085197d2fce6dbe4d9b43 | |
| parent | a3f4565e0a643f03815904768556e53f2544ccbd (diff) | |
| download | iproute2-be24eab05d664ff63d1216498e5f2e6986ccafc7.tar.gz | |
bridge: mdb: Document the catchall MDB entries
Document the catchall MDB entries used to transmit IPv4 and IPv6
unregistered multicast packets.
In deployments where inter-subnet multicast forwarding is used, not all
the VTEPs in a tenant domain are members in all the broadcast domains.
It is therefore advantageous to transmit BULL (broadcast, unknown
unicast and link-local multicast) and unregistered IP multicast traffic
on different tunnels. If the same tunnel was used, a VTEP only
interested in IP multicast traffic would also pull all the BULL traffic
and drop it as it is not a member in the originating broadcast domain
[1].
[1] https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-irb-mcast#section-2.6
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
| -rw-r--r-- | man/man8/bridge.8 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 index 9753ce9e9..4006ad23e 100644 --- a/man/man8/bridge.8 +++ b/man/man8/bridge.8 @@ -1014,6 +1014,12 @@ device name of the outgoing interface for the VXLAN device to reach the remote VXLAN tunnel endpoint. .in -8 +The 0.0.0.0 and :: MDB entries are special catchall entries used to flood IPv4 +and IPv6 unregistered multicast packets, respectively. Therefore, when these +entries are programmed, the catchall 00:00:00:00:00:00 FDB entry will only +flood broadcast, unknown unicast and link-local multicast. + +.in -8 .SS bridge mdb delete - delete a multicast group database entry This command removes an existing mdb entry. |