From: Taehee Yoo <ap420...@gmail.com> Date: Wed, 27 May 2020 16:29:50 +0000
> vxlan fdb can have NDA_IFINDEX, which indicates an out interface. > If the interface is removed, that fdb will not work. > So, when interface is removed, vxlan's fdb can be removed. > > Test commands: > ip link add dummy0 type dummy > ip link add vxlan0 type vxlan vni 1000 > bridge fdb add 11:22:33:44:55:66 dst 1.1.1.1 dev vxlan0 via dummy0 self > ip link del dummy0 > > Before this patch, fdbs will not be removed. > Result: > bridge fdb show dev vxlan0 > 11:22:33:44:55:66 dst 1.1.1.1 via if10 self permanent > > 'if10' indicates 'dummy0' interface index. > But the dummy0 interface was removed so this fdb will not work. > > Signed-off-by: Taehee Yoo <ap420...@gmail.com> But if someone adds an interface afterwards with ifindex 10 that FDB entry will start using it. I don't know how desirable that is, but if someone is depending upon that behavior now this change will break things for them.
