Brocade switch with discard c3 timeout and Link Reset errors on port

• The output of porterrshow  indicates enc in, crc err, crc g_eof, bad eof, enc out, disc c3 and c3 timeout TX error counters.


          frames        enc     crc     crc     too     too     bad     enc    disc    link    loss    loss    frjt    fbsy     c3timeout     pcs      uncor
        tx       rx      in     err     g_eof   shrt    long    eof     out    c3      fail    sync    sig                      tx      rx      err     err
43:  236.7g   48.3g    0       0       0       0       0       0       0     759.1k    0       0       0       0       0     745.0k    0       0       0
44:  190.4g   52.0g    0       0       0       0       0       0       0     159.6k    0       0       0       0       0      14.0k    0       0       0

portstatsshow 43
stat_wtx             103996989840722     4-byte words transmitted
stat_wrx             7913511765082       4-byte words received
stat_ftx             236722960792        Frames transmitted
stat_frx             48374010656         Frames received
stat_c2_frx          0                   Class 2 frames received
stat_c3_frx          1129389782          Class 3 frames received
tim_txcrd_z          3048535438          Time TX Credit Zero (2.5Us ticks)

portstatsshow 44
stat_wtx             80410729360421      4-byte words transmitted
stat_wrx             11229784141562      4-byte words received
stat_ftx             190486037404        Frames transmitted
stat_frx             52074255621         Frames received
stat_c2_frx          0                   Class 2 frames received
stat_c3_frx          534672708           Class 3 frames received
tim_txcrd_z          2207020721          Time TX Credit Zero (2.5Us ticks)

Fabric Performance Impact|
(4533)          |8          |defALL_PORTS_OVERSUBSCRIBED|11/12/25 12:32:15|F-Port 3/43      |OVERSUBSCRIBED |
                |8          |defALL_PORTS_OVERSUBSCRIPTI|11/12/25 12:33:05|F-Port 3/43      |OVERSUBSCRIPTION_CLEAR|
                |1          |defALL_PORTS_IO_LATENCY_CLE|11/12/25 12:24:05|F-Port 3/43      |IO_LATENCY_CLEAR      |
                |1          |defALL_PORTS_IO_FRAME_LOSS |11/12/25 12:23:55|F-Port 3/43      |IO_FRAME_LOSS         |


2025/11/12-11:26:07 (IST), [C4-1014], 7786177, SLOT 2 | CHASSIS | PORT 3/43, WARNING, XXX-XXX,  Link Reset on Port S3,P43(75) vc_no=0 crd(s)lost=15 auto trigger.
2025/11/12-12:23:48 (IST), [C4-1014], 7786178, SLOT 2 | CHASSIS | PORT 3/43, WARNING, XXXX,  Link Reset on Port S3,P43(75) vc_no=0 crd(s)lost=15 auto trigger.
2025/11/10-10:55:31 (IST), [C4-1014], 7786039, SLOT 2 | CHASSIS | PORT 3/44, WARNING, XXXX,  Link Reset on Port S3,P44(77) vc_no=0 crd(s)lost=15 auto trigger.
2025/11/11-18:46:54 (IST), [C4-1014], 7786091, SLOT 2 | CHASSIS | PORT 3/44, WARNING, XXXXX,  Link Reset on Port S3,P44(77) vc_no=0 crd(s)lost=15 auto trigger.

• Only proceed with the solution after completing the troubleshooting steps below.
  • Reseat and clean the cable at both ends, including the patch panel.
  • Reseat the SFPs on both ends.