LACP port is Flapping

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L1 Bithead

LACP port is Flapping

LACP configure between PA and cisco switch 

Active and Active mode and transmission rate: slow

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LACP System log::::LACP interface ethernet1/19 moved out of AE-group ae2. Selection state Unselected(Link down)

 

l2ctrld.log file below 

2020-04-12 00:19:25.085 +0400 Got port 82 event, link 0, speed 4, duplex 2
2020-04-12 00:19:25.086 +0400 port 82 is full duplex. Enable lacp
2020-04-12 00:19:25.086 +0400 ethernet1/19 idx 82 mux state change RX_TX=>ATTACHED, select_state Unselected(Link down), partner state 0x3d

2020-04-12 00:19:25.086 +0400 post LACP event to DP: if_idx 82, up 0
2020-04-12 00:19:25.086 +0400 log ethernet1/19 idx 82 leaves lag. sel state Unselected(Link down)
2020-04-12 00:19:25.335 +0400 ethernet1/19 idx 82, mux state change ATTACHED=>DETACHED
2020-04-12 00:20:36.584 +0400 ethernet1/19 idx 82, current_while expired.
2020-04-12 00:20:36.584 +0400 ethernet1/19 idx 82, rx state change CURRENT=>EXPIRED
2020-04-12 00:20:39.584 +0400 ethernet1/19 idx 82, current_while expired.
2020-04-12 00:20:39.584 +0400 ethernet1/19 idx 82, rx state change EXPIRED=>DEFAULTED
2020-04-12 00:23:09.585 +0400 Got port 82 event, link 1, speed 4, duplex 2
2020-04-12 00:23:09.585 +0400 port 82 is full duplex. Enable lacp

 

what could be the reason for Flapping and how we can resolve

Highlighted
L4 Transporter

Re: LACP port is Flapping

What does it show on the Cisco end?  What is the log on the Cisco switch show?

 

I ran into similar problem in the past, both were related to physical media issues (one time is SFP, one time is fiber jumper)

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