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2 lan bridges for redundancy with port channels


 Hi all, ive got a question for you,

Ive attached a picture of a job i look after. The other day the link failed, one end of one link died and the port channel didn't swap over to the backup link. I had to get someone on site to unplug port 38 on switch 140 to force the port channel to swap over. I feel like there must be a better way to do this?? Also whichever link isn't in use i can't see those 2 devices on the network, which is painful when i want to check if they are still Healthy. Ideally id like traffic balanced between the links  

looking forward to your comments thank you. 


4 Replies 4

MHM Cisco World
VIP Mentor VIP Mentor
VIP Mentor

the port-channel with mode ON not exchange the LACP message which in your case can help you to make each side detect the failed of Link. 
so change the mode from ON to LACP-active and check again.

Will do, thanks for your reply

paul driver
VIP Expert VIP Expert
VIP Expert

With the physical topology you show can you confirm the cisco switch supports Multichassis EtherChannel otherwise your port-channel will not work as you expect it to because you are trying to implement MEC connections between the cisco switch and two different bridges ( cisco/ubiquiti ).

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Kind Regards

Hi, im not sure if it does or not. 3560-v2 switches. As i say it does appear to work ok. but the port on the switch has to be off/ disconnected for the port channel to use the spare link. When the primary link failed it still had the copper link to the switch up just no radio connectivity. A simple thing where the switches ping each other for failed link detection would be good. Thanks for your reply

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