Description

On PTX5000/PTX3000 platforms with t6e-pic installed (for example P3-10-U-QSFP28, P3-15-U-QSFP28, and P3-24-U-QSFP28), a port may fail to perform Decision Feedback Equalizer (DFE) tuning after aggressive link flaps on these PICs and the interface may be stuck in down status.

Restarting the corresponding PIC is expected to resolve the issue.

Symptoms

The following messages are seen continuously in the logs until the issue is addressed.

fpc0 prds_if_pg_wanio_check_rx_los:  itable 62 empty or not initialized
fpc0 t6e_cr_phy_dfe_coarse_tuning_start: Failed to check rx los on et-0/1/1 xcvr_port 1 channel 0 reg_id 62
fpc0 t6e_dfe_tuning_state: Failed t enable dfe tuning over the link 1

Solution

Restarting (taking offline/bringing online) the corresponding PIC is expected to resolve the issue. 

Modification History

First draft 2022-07-11

Related Information

KB37421 - [PTX] Error message - t6e_dfe_tuning_state:et-6/0/0 - Failed to dfe tuning count [juniper.net]

PR1422535 4x10G interfaces on PTX3000/PTX5000 FPC type 3 might not come up after frequently flap for a large amount of time