Hi, We are facing problem since the replacement of EX3200 + JUNOS upgrade activity of EX4200 from 12.3 to 15.1R5.5, such that, etherchannel is not working in case primary link goes down. Under normal circumstances, AE interface carries traffic, while, in case primary fiber gets down, traffic is not shifted on backup. If we remove backup link from AE, traffic gets through which means, issue is not with backup media. Please note that ether-channel is configured in primary/backup mode on the switch. Currently, we have removed the AE configuration and using interfaces in trunk mode with manual configuration shift, in case primary gets down.
The configurations from the old EX3200 switch is attached.