LACP may intermittently stop distributing when master VAP is overloaded.
LACP stops distributing for a short period of time. Following messages appear in /var/log/messages:
Mar 28 02:46:38 fw_1 kernel: veth: port 1,3 stop distributing. Mar 28 02:46:46 fw_1 kernel: veth: port 1,3 start distributing.
Mar 28 12:14:54 fw_1 kernel: veth: port 1,5 stop distributing. Mar 28 12:14:55 fw_1 kernel: veth: port 1,5 start distributing.
When the master VAP is under high load, the exchange of LACP control messages with the neighbor switch may be delayed. This happens more likely when LACP is configured for fast updates and the control packets are sent every second. The normal rate at which LACP packets are sent is 30 seconds.
The current frequency (Slow or Fast) can be verified using the CLI command
Reporting Module fw_1
Load Balance State Selected
Circuit Name lan
Local Key 0x0200
Partner Key 0x0008
Partner Sys. Priority 32667
Partner ID 00:21:9a:12:c3:80
TX State Distributing
RX State Current
Check Frequency Fast Periodic
Local Oper. State LACP Activity, Aggregation, Synchronization, Collecting, Distributing
The LACP frequency isn't configurable on X-series. Please change the frequency on the neighbor switch to allow slow LACP updates. See your switch documentation for information how to change the frequency. On Cisco devices, the command is
lacp rate normal in the interface context.
Imported Document ID: 000018900
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