3750-2960 Vlans Issue via Port Channel

[Corneliu Paunescu]

Im trying to get all my vlans to pass thru to my 2960 user level switches, from my 3750 stack.

Each one of my 2960 stack is connected to my 3750 via port channel. Here is my port setup.

I have Vlans 1,210,214,216,220,306,406 on my 3750 stack. I cannot see those vlans on my 2960 stack. Why is that? What am I missing from the config?

Thanks...

3750 ports:

interface GigabitEthernet1/0/41

description Uplink to ETHSW03

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,210,214,216,220,306,406

switchport mode trunk

snmp trap mac-notification change added

snmp trap mac-notification change removed

spanning-tree guard loop

channel-protocol lacp

channel-group 7 mode active

interface GigabitEthernet1/0/42

description Uplink to ETHSW03

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,210,214,216,220,306,406

switchport mode trunk

snmp trap mac-notification change added

snmp trap mac-notification change removed

spanning-tree guard loop

channel-protocol lacp

channel-group 7 mode active

interface Port-channel7

description Uplink to ETHSW03

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,210,214,216,220,306,406

switchport mode trunk

snmp trap mac-notification change added

snmp trap mac-notification change removed

spanning-tree guard loop

Here are my 2960 ports setup:

interface GigabitEthernet1/0/47
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 1 mode active

interface GigabitEthernet1/0/48
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 1 mode active

interface Port-channel1
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop

[Rolf Fischer · Accepted solution]

If my datacenter network is set to transparent, I should be able to set one of my sites to server, and create a specific domain ONLY for that site.
Is that correct?

Yes. And use a password, just to be be on the safe side ;-)

[Corneliu Paunescu]

Thank you sir. You been extremely helpful. I will configure a domain and add a password, that way the datacenter will not learn it from one of our sites.

Thanks....

[Rolf Fischer]

You're welcome. Thank you for rating and mark as answered.

Let us know if everything has worked and try to familiarize a little bit with the protocol details.

Best regards

Rolf

[Rolf Fischer]

I totally forgot a (relatively) new feature which I'd like to recommend for the ports to the data-centers.

Recent IOS allow you to disable VTP on a per-port basis (introduced with VTPv3 but I think should work with v1/v2 as well):

Configuring VTP on a Per-Port Basis

Best regards,

Rolf