I have created an MLAG according to the instruction. The status is all in green, Mpo is up, however when I have added a VLAN to Mpo and a port on the slave switch where I have a single homed server connected the packets are not passed. (destination host unreachable).
The same happens with access vlan.
I have even created the VLAN interfaces on the switches and it becomes even more interesting:
Server A - Switch 1 - Switch 2 - server B
server A is connected only to Switch 1
server B to both Switch 1 and Switch 2 via MLAG with LACP Active mode,
LACP shows 2 links active on both server and the switch
lets say I create an VLAN interface on both switches, switch A gets 192.168.1.1, switch B 192.168.1.2.
I put both servers in the 192.168.1.0/24 subnet
Now magic happens:
I can ping 192.168.1.1 AND 192.168.1.2 from server A
I can ping 192.168.1.2 ONLY from server B
I cannot ping one server from the other.
When I tear down the Mpo and ping server A from server B through interface connected to switch 1 - ping returns ok, but when I do the same trhough interface conencted to switch 2 - ping bounces (I guess this is normal? the traffic outside Mpo will not traverse IPL?)
When I connect server A to switch 2 I can ping one server from the other over Mpo/LACP on server B, however if I kill the switch 2 interface for serverB leaving only switch 1 connection the traffic stops flowing as it would not cross IPL…
Any way to debug this further? Tried to find a solution for 2 days now and it seems more and more strange.
sw version 3.6.8012 on both switches.