[c-nsp] Problems adding VLAN's to portchannel trunk

[Jeff Fitzwater]

Add them to the port channel interface NOT the physical ports. 

Jeff Fitzwater
OIT Network Systems
Princeton University

Nate Carlson wrote:
> We've got a 6509 [12.2(17a)SX1] connected to a couple switches in a HP 
> c-Class blade chassis, which are Cisco 3020's [CBS30X0-LANBASE-M, 
> 12.2(25)SEF1]. We've got an issue where we can't add a VLAN to the trunk 
> without it going down because of VLAN mismatch while we are trying to add 
> it to all three interfaces on each side (the two gig's, and the 
> portchannel interface.] Here's what our config looks like; if anyone has 
> advice on how we could add VLAN's to the allowed list without the links 
> dropping, I'd love to hear it!
>
> 3020:
> !
> interface Port-channel1
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   spanning-tree link-type shared
> !
> interface GigabitEthernet0/17
>   description description Trunk to cat1 (6509) port 6/19
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   channel-group 1 mode desirable
>   spanning-tree link-type shared
> !
> interface GigabitEthernet0/18
>   description description Trunk to cat1 (6509) port 7/19
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   channel-group 1 mode desirable
>   spanning-tree link-type shared
> !
>
>
> 6509:
> !
> interface Port-channel1
>   description hp c-class switch port 6/19, 7/19
>   no ip address
>   flowcontrol receive on
>   switchport
>   switchport trunk encapsulation dot1q
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   switchport nonegotiate
>   spanning-tree link-type shared
> !
> interface GigabitEthernet6/19
>   description trunk to hp c-class port 0/17
>   no ip address
>   logging event link-status
>   flowcontrol receive on
>   switchport
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   switchport nonegotiate
>   spanning-tree link-type shared
>   channel-group 1 mode desirable
> !
> interface GigabitEthernet7/19
>   description trunk to hp c-class port 0/18
>   no ip address
>   logging event link-status
>   flowcontrol receive on
>   switchport
>   switchport trunk allowed vlan 1,20,25
>   switchport mode trunk
>   switchport nonegotiate
>   spanning-tree link-type shared
>   channel-group 1 mode desirable
> !
>
>
> ------------------------------------------------------------------------
> | nate carlson | natecars at natecarlson.com | http://www.natecarlson.com |
> |       depriving some poor village of its idiot since 1981            |
> ------------------------------------------------------------------------
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