Configuration of VLANs Uplink from one cisco to another cisco

[Krischeu]

Hi,

we are upgrading our old network. We still have a SG200-50P running with some VLAN to seperate the network from each other.

Now I added a new CBS350-48-P4X. I connected this with copper cable from port 49 (old switch) to port 47 (new switch).

I created VLAN 21,22,23,120. Those are the same as at the old switch.

When I go to a port, e.g. Port 2, I put this as tagged to VLAN1, I can still ping my devices at VLAN 120. This should not work, but it does work.

Can anybody give me a hand?

Cheers

Heinz

[Krischeu · Accepted solution]

Old Switch configuration uplink port 49:

Interface settings: Trunk, Administrative PVID:1

Port to VLAN: tagged

Port VLAN Membership: 

Administrative VLANs:	1UP, 21T, 22T, 23T, 120T
Operational VLANs:	1UP, 21T, 22T, 23T, 120T

New Switch configuration uplink port 47

Interface settings: Trunk

Port to VLAN: TAGGED

Port VLAN Membership: 

Administrative VLANs:	1T, 21-23T, 120T, 2-20I, 24-119I, 121-4094I
Operational VLANs:	1T, 21-23T, 120T

So my Notebook is connected to the new switch on port 2 VLAN1 ( I guess ). And I still can ping my other PC at VLAN120. This should not work, because it should be seperated. When I am at the old switch - it is seperated.

Configuration at the new switch is:

VLAN Membership (active): Native VLAN ID:1

Tagged VLANs: All VLANs

Port VLAN Membership Details

Administrative VLANs:	21-23T, 120T, 1U, 2-20I, 24-119I, 121-4094I
Operational VLANs:	1U, 21-23T, 120T

[Ruben Cocheno]

@Krischeu 

thank you