One or more interfaces are not joining LAG | Unselected(Negotiation failed)
12077
Created On 01/04/23 09:47 AM - Last Modified 02/27/24 22:09 PM
Symptom
- Port channel or aggregation created between Active/Passive PA firewall and Switch Stack (multiple switches)
For ex:
- One/more links are not bundling in AE group.
> show lacp aggregate-ethernet ae1
LACP:
******************************************************************************
AE group: ae1
Members: Bndl Rx state Mux state Sel state
ethernet1/10 no Current Detached Unselected(Negotiation failed)
ethernet1/9 yes Current Tx_Rx Selected
- l2ctrld.log (less mp-log l2ctrld.log) reports negotiation failed.
2023-01-01 05:10:30.393 +0100 log ethernet1/10 idx 25 leaves lag. sel state Unselected(Negotiation failed)
Environment
- Active-Passive setup.
- LACP configured with switch stack.
Cause
One of the possible reason for interface to not bundle in aggregate group is misconfigured Port Channel on the switch side.
Resolution
- Fix port channel config on the Switch. Refer to the documentation of the switch to enable the proper port channel (multi switch trunk etc).
- If the issue continues after fixing the switch configuration, contact support.