PortChannel and interfaces

[toolshed1]

Hi,

If i need to add additional allowed vlans on trunk would i run command first on PortChannel interface or 2 physical interfaces?

Thanks.

[Kasun Bandara]

@toolshed1 add to portchannel interface.

[toolshed1]

Kasun,

Thanks for quick response. Just to confirm i already have existing PortChannel with allowed vlans and 2 Physical interfaces that are part of that PortChannel with same allowed vlans. I need to create additional vlans and add them to PortChannel and physical interfaces. I would have to add to PortChannel first and after that to 2 physical interfaces?

I should add that i want to do that without downtime.

[Kasun Bandara · Accepted solution]

@toolshed1 you need to add to port channel interface. no need to allow in physical interface. you can do without down time

make sure you are using 'add' key word.

ex. Switch(config-if)#switchport trunk allowed vlan add vlan-id

[bo chen]

For example, if you originally needed to add VLAN12 to vlan1, 2, and 3, you can configure it in the portchannel.

switchport trunk allowed vlan add 12

[bo chen]

sw1:

interface Port-channel1
switchport mode trunk

interface GigabitEthernet1/1/1
switchport mode trunk
channel-group 1 mode on

interface GigabitEthernet1/1/2
switchport mode trunk
channel-group 1 mode on

sw2:

interface Port-channel1
switchport mode trunk

interface GigabitEthernet1/1/1
switchport mode trunk
channel-group 1 mode on

interface GigabitEthernet1/1/2
switchport mode trunk
channel-group 1 mode on

[bo chen]

Verification View command:

show etherchannel summary 

[Joseph W. Doherty]

BTW and FYI, over the years (and decades) more and commands are applied on the PC interface.

With current gen IOS, if command applies logically to the bundle, it likely can be applied to the PC interface.  If command deals with individual physical interfaces, then it may need to be applied to individual physical interfaces.