Adding VLAN to Live port channel

Hey all,

I am adding a VLAN to an existing portchannel from our core 6513 to cisco blade switches.
The port channel has 4 physical interfaces tied to it.

What is the best way to apply the new VLAN (4) the the port channel without the port channel going down? Also, should I do the farend first, the bladeswitch?

the current configuration is as follows:

interface Port-channel1
 description MOU-DAT-BS3-Po1
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 34
 switchport trunk allowed vlan 2,3,34,35,135,1600
 switchport mode trunk       
 switchport nonegotiate
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The thing is to apply the command to the port-channel interface and not the individual links because if you apply it to the individual links they may drop out of the etherchannel.

 You should be ok to apply it on one end and then on the other without affecting the portchannel but if you are nervous about it, the best thing to do is to do it out of hours.

 The following cmd will work under port channel interface without any traffic outage but for good do it out of hours.

     switchport trunk allowed vlan 2,3,4,34,35,135,1600

Soulja53 6F 75 6C 6A 61 Commented:
You can add a vlan to the port channel with no issues. The port channel will not go down.

int po1 (or whatever you port channel number is)
switchport trunk allowed vlan add 4

You don't need to reenter every vlan as noted above.

Do this on both sides.

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shanehootonAuthor Commented:
Thanks a lot for everyone's comments!

I did the following command on the port channels starting with the far end.

switchport trunk allowed vlan add 4

it worked perfect and the port channel never dropped. and as a precaution I made the change during maintenance hours.
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