Hi there,
I am having problems with and etherchannel between 2 stacks of Catalyst 3750X. It was working for several weeks but now, one interface is down.
I have 2 3750X in stack at site A, and 2 3750X in stack at site B. They are connected through fiber in cross-stack way. This is:
1/1/4 ---> 2/1/4
2/1/4 ---> 1/1/4
We are using 100FX SFPs because of distance between Site A and Site B (more than 550m).
Some weeks ago, we configured the etherchannel and everything was working perfectly.
The configuration is:
SITE A
interface GigabitEthernet1/1/4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
channel-group 1 mode active
end
interface GigabitEthernet2/1/4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
channel-group 1 mode active
end
interface Port-channel1
description AGREGACION->SWIPOCCIS01
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
end
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi1/1/4(I) Gi2/1/4(P)
SITE B
interface GigabitEthernet1/1/4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
channel-group 1 mode active
end
interface GigabitEthernet2/1/4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
channel-group 1 mode active
end
interface Port-channel1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk
duplex full
end
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi1/1/4(P) Gi2/1/4(D)
As you can see, at site A the interface 1/1/4 is marked as "I", and at site B the interface 2/1/4 is marked as "D".
The weird thing here is that at site A the LED of 1/1/4 is GREEN, and the LED for 2/1/4 at site B is OFF. Very weird thing ...
Any ideas?
Thank you very much.
