Customer has reported that LACP is not coming up on one of the aggregate bundle - child interfaces post FPC0 reboot.

{master}

re0-router1> show lacp interfaces ae33

Aggregated interface: ae33

LACP state: Role Exp Def Dist Col Syn Aggr Timeout Activity

et-0/0/5 Actor No Yes No No No Yes Fast Active

et-0/0/5 Partner No Yes No No No Yes Fast Passive

LACP protocol: Receive State Transmit State Mux State

et-0/0/5 Port disabled No periodic Detached >>>>>>> Status showing detached

root@re0-router1-fpc0:pfe> show picd serdes summary   

          port   serdes         xcvr       init  tune  pfe

name       mode   mode   state     type   lpbk  cnt  cnt   idx  sbus

---------------  ------  ------  -----------  -------  ----  ----  -----  ---  ---------

serdes-0/0/0:0  1x100G  2x50   Tune_Ok    default  none   0    2   1  15.0 15.1

serdes-0/0/1:0  1x100G  2x50   Tune_Ok    default  none   0    1   1  15.2 15.3

serdes-0/0/2:0  1x100G  2x50   Tune_Ok    default  none   0    3   1  15.4 15.5

serdes-0/0/5:0  1x100G  2x50   Tune_Failed  lr4    none   0  12482   1  16.6 16.7



We checked the logs from PFE and we could find the reason for Interface down and its due to "Tune_failure" under the interface serdes and also we could see Tuning timer already stopped.

JIJO (jack in and Jack out) process resolved the problem.

we also found an alternate option by using CLI command post working with our engineering to retune the SERDES tuning.

test picd serdes fpc 0 pic 0 port 0 cmd tune.  --- >> this command triggers retune.

Note - Use this command only under the presence of JTAC engineer.