Aggregate Ethernet (AE) Interface Showing Down on Passive Firewall.
94526
Created On 03/27/19 13:34 PM - Last Modified 11/12/20 22:26 PM
Symptom
- Firewall running on active-passive HA
- Aggregate Ethernet Interface is configured with LACP enabled.
- AE interface is up on the the Active Firewall. However, it is down on the Passive Firewall
- Passive Link State (Under Device> High Availability> General > Active/Passive Settings) is enabled on both firewalls and members of the AE Interface are up on the Passive Firewall.
Environment
- Firewall running in Active-Passive HA
- PA-500
- PA-3000 Series
- PA-4000 Series
- PA-5000 Series
- PA-5200 Series
Cause
Firewall in the passive state will not participate in LACP negotiation (does not LACP pre-negotiation) unless "Enable in HA Passive State" is selected.
Resolution
- Select "Enable in HA Passive State" under the High Availability Options on the LACP tab of the AE Interface.
- Doing this will enable LACP pre-negotiation for the passive firewall.
- LACP pre-negotiation enables quicker failover to the passive firewall.
Additional Information
NOTE: LACP Pre-negotiation is not supported on VM-Series firewalls along with PA-200, PA-220, and PA-800 series till PAN-OS 8.1. Starting PAN-OS 9.0, LACP Pre-negotiation is supported on all platforms except VM Series.