By default in Juniper, LACP timer is fast which is 1 sec, while in Cisco the default setting is slow which is 30 secs. If connecting Juniper devices to non-Juniper routers or switches, the LACP timer will have mismatch thus it can cause LACP timing out due to not receiving PDU packets in a timely manner.
show log messages | match lacp
Sample error logs: user1@QFX-Router1-re0> show log messages | match lacp
Sep 6 08:23:10.002 2020 QFX-Router1-re0 lacpd[7292]: %DAEMON-5-LACPD_TIMEOUT: xe-0/0/0: lacp current while timer expired current Receive State: CURRENT
Sep 6 08:23:10.002 2020 QFX-Router1-re0 lacpd[7292]: %DAEMON-5-LACP_INTF_DOWN: ae30: Interface marked down due to lacp timeout on member xe-0/0/0
configureset interfaces <interface> aggregated-ether-options lacp periodic <fast/slow>
commit
FIX: user1@QFX-Router1-re0> configure
user1@QFX-Router1-re0# set interfaces ae1 aggregated-ether-options lacp periodic slow
user1@QFX-Router1-re0# commit
Verify:
show lacp interfaces <interface>
Before:
user1@QFX-Router1-re0> show lacp interfaces ae1
Aggregated interface: ae1
LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
xe-0/0/0 Actor No No Yes Yes Yes Yes Fast Active
xe-0/0/0 Partner No No Yes Yes Yes Yes Slow Active
xe-0/0/1 Actor No No Yes Yes Yes Yes Fast Active
xe-0/0/1 Partner No No Yes Yes Yes Yes Slow Active
LACP protocol: Receive State Transmit State Mux State
xe-0/0/0 Current Slow periodic Collecting distributing
xe-0/0/1 Current Slow periodic Collecting distributing
{master}
After:
user1@QFX-Router1-re0> show lacp interfaces ae1
Aggregated interface: ae1
LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity
xe-0/0/0 Actor No No Yes Yes Yes Yes Slow Active
xe-0/0/0 Partner No No Yes Yes Yes Yes Slow Active
xe-0/0/1 Actor No No Yes Yes Yes Yes Slow Active
xe-0/0/1 Partner No No Yes Yes Yes Yes Slow Active
LACP protocol: Receive State Transmit State Mux State
xe-0/0/0 Current Slow periodic Collecting distributing
xe-0/0/1 Current Slow periodic Collecting distributing
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