N7K and adding VLANs to a trunk

[Chris McDaniel]

Group  -

Thanks in advance for your assistance.  I should know the answer to my question, but for the life of me I can not remember. 

When you use the command

switchport trunk allowed vlan add [vlan-id]

There should be no drop in service to the existing VLANs, correct?  I am trunking from a 7K to a 2960S via 2G PoCh.

[Reza Sharifi · Accepted solution]

That is correct.  if you use switchport trunk allowed vlan add [vlan-id] than there is no drop in services.

Be careful not to use this

switchport trunk allowed vlan [vlan-id]

This will delete all the vlans on the trunk and only add the vlan you specify here

HTH

[Chris McDaniel]

Thanks!