Hi,
during configuration of my Summit X460 and X440 switches I've encounter a problem with VLAN communication between switches.
Topology:
comp1 ==(port23) SW1 (port1)==(port24) SW2 (port1)==(port1) SW3 (port2)== comp2
The objective is to communicate between comp1 and comp2 via vlan "v50". Well, there are actually small networks in comp1 and comp2 places, but that's irrelevant in this case. To simplify things I will describe only VLAN "v50" configuration issue, however the same problem exists with other VLANs and VMANs configured on swiches.
VLAN configuration which works:
SW1 - X460:
vlan "v50" ports: 1 tagged, port 23 untagged
vlan "Default" ports: 1 tagged
SW2 - X440:
vlan "v50" ports: 1 tagged, 24 tagged
vlan "Default" ports: 1 tagged
SW3 - X440:
vlan "v50" ports: 1 tagged, 2 untagged
With above configuration comp1 and comp2 can communicate via VLAN "v50".
The problem shows up when I remove port 1 on SW1 from VLAN "Default", or remove ports 1,24 on SW2 from VLAN "Default". Comp1 and Comp2 cannot communicate any more (for example no ping). From comp1 I can only reach SW2, further communication is I think not forwarded. What's more even if I disable VLAN "Default" on every switch, but leave ports assignet to it, communication in VLAN "v50" works. Removing ports from VLAN "Default" results in no communication between comp1 and comp2 via "v50".
STP is disabled on every switch.
I would be grateful for your help in solving this problem.
Best regards,
Krzysztof
