VLAN-leak with a cable

[MartK]

Hello forum,
Is it possible to leak a VLAN to another VLAN with a cable within the same switch? OS6560-48X4

We have two VLAN in the switch. VLAN 100+200
A DHCP-service is running on VLAN 100. We want to leak VLAN 100 to VLAN 200 but be able to disconnect it with a cable.
Right now VLAN 100 is untagged on 1/1/10. VLAN 200 is untagged on 1/1/20.
The DHCP-server is connected on 1/1/1 with VLAN 100 tagged.

If we connect 1/1/10 (100u) to 1/1/20 (200u) both VLANs on their respective port get status blocked. I guess the switch doesn't like that.
The ports are still up and there are no violations.

[silvio]

This is the correct way - both ports untagged in different vlan.
The blocking is because of spanning tree. You need to disable this.
For stp in flat mode you use the command

Code: Select all

spantree cist port 1/1/10 disable
spantree cist port 1/1/20 disable

For stp in perVlan mode:

Code: Select all

spantree vlan 100 port 1/1/10 disable
spantree vlan 200 port 1/1/20 disable

Loopback-detection needs also to be disabled at this ports (this is the default).

BR Silvio