01-27-2007 11:27 PM - edited 03-05-2019 02:01 PM
Hi, everyone.
I have a problem when I configure two 3550-emi switch. On both 3550 switch, I have configured FEC link on fastethernet port 0/3 and 0/4. But only link is up at the same time.
The log say: %EC-5-L3DONTBNDL2: Fa0/4 suspended: incompatible partner port with Fa0/3; but the configuration on both switch and both 4 ports are same as below, I don't know why?
---------------------------------------
interface Port-channel44
no switchport
ip address 3.3.3.3 255.255.255.0
duplex full
!
interface FastEthernet0/3
description BSW2 0/3 to BSW1 0/3
no switchport
no ip address
duplex full
speed 100
channel-group 44 mode desirable
!
interface FastEthernet0/4
description BSW1 0/4 to BSW2 0/4
no switchport
no ip address
duplex full
speed 100
channel-group 44 mode desirable
!
I have try Layer 3 FEC and Layer 2 FEC(with trunk link), but the result is same.
Anyone can help me?
With Best Regards.
Tao
01-27-2007 11:36 PM
The layer 2 configuration is as below:
sw1:
-------------------------------------
interface Port-channel33
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
end
interface FastEthernet0/3
description BSW1 0/3 to BSW2 0/3
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 33 mode desirable
end
interface FastEthernet0/4
description BSW1 0/4 to BSW2 0/4
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 33 mode desirable
end
-----------------------
sw2
--------------------------------
interface Port-channel33
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
end
interface FastEthernet0/3
description BSW2 0/3 to BSW1 0/3
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 33 mode desirable
interface FastEthernet0/4
description BSW1 0/4 to BSW2 0/4
switchport trunk encapsulation dot1q
switchport trunk native vlan 951
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 33 mode desirable
-------------------------------------
But the result is same, only fas0/3 is up, line protocol in fas0/4 is down, log say:
Mar 1 14:55:49.212: %EC-5-L3DONTBNDL2: Fa0/4 suspended: incompatible partner port with Fa0/3
*Mar 1 14:55:57.188: %EC-5-L3DONTBNDL2: Fa0/4 suspended: incompatible partner port with Fa0/3
*Mar 1 14:56:27.196: %SM-4-BADEVENT: Event 'link_down' is invalid for the current state 'link_down': pm_port 0/3
-Traceback= 34A88C 32F000 2F8954 345CE8 346358 1C6440
*Mar 1 14:56:33.632: %EC-5-L3DONTBNDL2: Fa0/4 suspended: incompatible partner port with Fa0/3
*Mar 1 14:56:36.328: %EC-5-L3DONTBNDL2: Fa0/4 suspended: incompatible partner port with Fa0/3
anyone can help me?
Very thanks
Tao
01-27-2007 11:44 PM
when I finished the configuration as above, line protocaol on fa0/3 is up, but line protocaol on fas 0/4 is down.
Then i shutdown the fas0/3, line protocol on fas0/4 is up immediately.
why?
01-28-2007 12:43 AM
Hi
Can u try this.Dnot create the port-channel interface as when u assign the ports in a switch to form a channel it will be automatically created.
Thanks
Mahmood
01-28-2007 05:39 AM
Thanks, Mood.
I have try it again. And I found when i change channel-group mode to on from desirable, it is ok. But when i change to desirable again, same result. But port-channel interface is up always.
Who can give some advise. In production network, should I make it mode on or desirable?
01-28-2007 08:21 AM
Try adding the non-silent command at the end of the port channel statement for all interfaces and see what happens . Also for all your attaching ports make sure you have added the "switchport" command to make it a non routed port for a lyer 2 etherchannel.
channel-group 33 mode desirable non-silent
01-29-2007 01:15 AM
Tao,
try this setting the channel-group mode on switch1 to "desirable" and the channel-group mode on the switch2 to "auto"
Switch1:
channel-group 33 mode desirable
Switch2:
channel-group 33 mode auto
rgds.
ben
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