What was the command and where did you add it?
tv
----- Original Message -----
From: "Jared Gillis" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 07, 2010 2:23 PM
Subject: [c-nsp] Adding vlan to port-channel trunk causes port-channel
toflap
Hi all,
I just ran into a strange problem on a 3750ME. I've got two gig ports in
an active LACP port-channel looking like this:
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,102,400,664,1000-2999
switchport mode trunk
speed 1000
duplex full
channel-group 1 mode active
end
interface GigabitEthernet1/0/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,102,400,664,1000-2999
switchport mode trunk
speed 1000
duplex full
channel-group 1 mode active
end
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,102,400,664,1000-2999
switchport mode trunk
end
When I added vlan 400 to the trunk allowed vlan list, one of the
underlying gig ports flapped, which caused the port-channel to flap as
well.
Jan 7 12:09:27.647 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet1/0/1, changed state to down
Jan 7 12:09:27.656 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Port-channel1, changed state to down
Jan 7 12:09:28.654 PST: %LINK-3-UPDOWN: Interface Port-channel1, changed
state to down
Jan 7 12:09:31.464 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet1/0/1, changed state to up
Jan 7 12:09:32.454 PST: %LINK-3-UPDOWN: Interface Port-channel1, changed
state to up
Jan 7 12:09:33.461 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Port-channel1, changed state to up
Jan 7 12:09:48.745 PST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Vlan400, changed state to up
This definitely seems like something that should not happen. I'm running
Cisco IOS Software, C3750ME Software (C3750ME-I5K91-M), Version
12.2(46)SE, RELEASE SOFTWARE (fc2).
Any thoughts on what I should be checking?
--Jared
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