This command provides the ability to configure fallback. If fallback is enabled and LACP PDUs are not received on LACP-configured ports within the timeout period, the port with the lowest priority value will be added to the aggregator. The port stays in this state until fallback is disabled or until LACP PDUs are exchanged between the switch and its link partner, causing LAG (Link Aggregation Group) reconfiguration.
| port | LAG group ID. |
| fallback | Allow a single member port with lowest value priority to be added to the aggregator is LACP PDUs are not received within timeout. |
| enable | Enable fallback. Port priority and fallback timeout control port aggregator membership. |
| disable | Disable fallback. LACP PDUs or defaulted-state-action control port aggregator membership. |
Disabled.
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* # show lacp lag 17 detail
Lag Actor Actor Partner Partner Partner Agg Actor
Sys-Pri Key MAC Sys-Pri Key Count MAC
--------------------------------------------------------------------------------
17 0 0x03f9 00:00:00:00:00:00 0 0x0000 1 00:04:96:6d:55:13
Enabled : Yes
LAG State : Up
Unack count : 0
Wait-for-count : 0
Current timeout : Long
Activity mode : Active
Defaulted Action : Delete
Fallback : Enabled
Fallback timeout : 40 seconds
Receive state : Enabled
Transmit state : Enabled
Minimum active : 1
Selected count : 1
Standby count : 0
LAG Id flag : Yes
S.pri:0 , S.id:00:04:96:6d:55:13, K:0x03f9
T.pri:0 , T.id:00:00:00:00:00:00, L:0x0000
Port list:
Member Port Rx Sel Mux Actor Partner
Port Priority State Logic State Flags Port
--------------------------------------------------------------------------------
17 10 Initialize Unselected Detached A-G----- 0
18 5 Initialize Fallback Collect-Dist A-GSCD-- 1018
19 5 Idle Unselected Detached -------- 0
================================================================================
Actor Flags: A-Activity, T-Timeout, G-Aggregation, S-Synchronization
C-Collecting, D-Distributing, F-Defaulted, E-Expired
This command was first available in ExtremeXOS 21.1.
This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.