Cisco VLAN Trunking

If we have two Cisco 6500 switches and there are two Ten Gigabit ports used for trunking and there are  Vlan's 4,5,6 & 7 being allowed to trunk between the two switches.

In the above scenario: If I want to create a new Vlan on one of the switches and want it to be allowed so that the new Vlan is trunked across the other switch - what do I have to do.

Do I create the VLan on Primary switch and then just add the vlan on the trunk port or do i create the same vlan on both switches and then add the new vlan on trunk ports on both switches.

Finally, what type of cable is required to trunk ports between two switches.
Who is Participating?
adam_kan2000Connect With a Mentor Author Commented:
Thanks harshm80 i may need more infor will get back to you.
Gianpiero RossiConnect With a Mentor System AdministratorCommented:
Hello you have to create the new vLan on every switch that you want it pass trought and obviosly you must add the vLan in every trunk port.

Hope that help


ffleismaConnect With a Mentor Senior Network EngineerCommented:
if your using VTP you can setup and configure one switch as the VTP server, hence you would only need to add the new VLAN configuration on the assign switch as VTP server, it would communicate the new created VLAN to the other switches.

it would also automatically allow the new created VLAN  on the trunk if that VLAN exist on a port on the other switch and not implicitly pruned.

if your going to use copper medium, between two switches would require cross-over cables. you have to take note that your using a 6500 multilayer switch, hence it is also capable of routing, so if ports are setup for layer 3 (no switchport, interface command) then port acts as a routed port. connection between a router and a switch requires straighthru

you can use the below link as reference to VTP.

hope it helps :-)
harshm80Connect With a Mentor Commented:
hello Adam,

If you are using two links as trunks between two switches and then u can create a port channe and make these two trunks part of the port channell , in that case apart from creating vlans indvidually on each switch you need to allow those vlans on the port channel , the advantage with this design is if one of the link  fails u still have one other trunk on which traffic will continue to move . Kindly not but in this case vlans should be allowed on the port channel and not the interface...

let me know if you need more info on this..
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