IBM Bladecenter H chasssis
Two IBM 10GB ethernet switch modules in the back of the Bladecenter, one in Bay7 and one in Bay9
Two physical connections from each switch to a stack of two Juniper EX4500 switches. The connections are crossed over for redundancy:
- Connection1 - from IBM switch1 (Bay7) to Juniper switch1
- Connection2 - from IBM switch1 (Bay7) to Juniper switch2
- Connection3 - from IBM switch2 (Bay9) to Juniper switch1
- Connection4 - from IBM switch2 (Bay9) to Juniper switch2
The 4 connections are setup in a single LACP bundle which is set active on both ends. We are running version 220.127.116.11 code on the IBM switches.
I see traffic on Connections 1 & 2 and nothing on Connections 3 & 4. In other words, the switch in Bay7 is passing traffic while switch in Bay9 has no traffic. I know LACP is used for redundancy but I thought it could also load balance. Why are half of my links not transmitted/receiving traffic?