LACP error : ethernet x/y idx z received pdu partner does not match local actor
21177
Created On 11/16/23 23:26 PM - Last Modified 07/24/25 19:48 PM
Symptom
From System Log
critical lacp ethern link-do 0 LACP interface ethernet1/16 moved out of AE-group ae1. Selection state Unselected(Link down) critical lacp ethern nego-fa 0 LACP interface ethernet1/16 moved out of AE-group ae1. Selection state Unselected(Negotiation failed) critical lacp ethern nego-fa 0 LACP interface ethernet1/15 moved out of AE-group ae1. Selection state Unselected(Negotiation failed) critical lacp ethern nego-fa 0 LACP interface ethernet1/14 moved out of AE-group ae1. Selection state Unselected(Negotiation failed) critical lacp ethern nego-fa 0 LACP interface ethernet1/13 moved out of AE-group ae1. Selection state Selected
From l2ctrld.log
+0000 post LACP event to DP: if_idx 28, up 1
+0000 log ethernet1/13 idx 28 join lag
+0000 ethernet1/13 idx 28 set to unselected, clear actor sync
+0000 ethernet1/13 idx 28 received pdu partner does not match local actor
+0000 Recved LACPDU actor:
sys_pri 32768, system_mac 02:8e:38:13:4c:a7, key 1, port_pri 32768, port_num 341, state 0x3f partner
sys_pri 4000, system_mac 00:23:04:ee:be:63, key 32779, port_pri 32768, port_num 16642, state 0x3d Selecting ethernet1/13, idx 28
Environment
Any PA firewall
PAN-OS 10.0.0 or later
Cause
The cause of the issue can be due to following
1. Check the settings for LACP mode, Transmission rate settings both on the firewall and the Peer device
2. Issue on the peer device which might be sending unexpected PDU
3. SFP compatibility
4. Cabling or port issue
Resolution
1. Please make sure if the required mode i.e Active/Passive and transmission rate slow/fast is set
Note : If both the peers are in "Passive State", LACP connection will not be established
Port State
--------------------------------------------------------------------------------
Interface Port
Number Priority Mode Rate Key State
--------------------------------------------------------------------------------
ethernet1/15 30 32768 Passive Slow 65 0x3C
Partner 294 32768 Active Slow 90 0x3D
ethernet1/16 31 32768 Passive Slow 65 0x44. --------------> This
Partner 0 0 Passive Slow 0 0x00 ----------------------> This2. Customer will have to troubleshoot if there is any mismatch in any configuration and check logs on the peer device.
3. Both the peers must confirm SFP compatibility
4. Both the peers must check for Layer 1 issues