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

[Nate Carlson]

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
!


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| nate carlson | natecars at natecarlson.com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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