Low Rx power reported on Brocade switch port due to faulty cable

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Category:: fabric-interconnect-and-management-switches

Specialty:: brocade

Last Updated:

Applies to

Brocade Switch

Issue

sfpshow reports Rx value is too low

Slot 5/Port 21: ============= Identifier: 3 SFP Connector: 7 LC Transceiver: 6804404000000000 8,16,32_Gbps M5 sw Short_dist [...] Vendor Name: BROCADE Vendor OUI: 00:05:1e Vendor PN: 57-1000333-01 Vendor Rev: A [...] Temperature: 59 Centigrade Current: 7.640 mAmps Voltage: 3327.1 mVolts RX Power: -25.1 dBm (3.1 uW) TX Power: -1.3 dBm (743.9 uW)

ISL port report low RX:

============= Slot 7/Port 56: ============= QSFP No: 14 Channel No:0 Identifier: 17 QSFP28 Connector: 12 MPO Parallel Optic Transceiver: 2802404000000080 16,32_Gbps OM3 sw Short_dist ... Vendor Name: BROCADE Vendor OUI: 00:05:1e Vendor PN: 57-1000351-01 Vendor Rev: A ... Temperature: 46 Centigrade Current: 6.948 mAmps Voltage: 3306.9 mVolts RX Power: -7.9 dBm (160.7uW) TX Power: -1.4 dBm (725.2 uW)

Enc_out errors repored under porterrshow:

/fabos/cliexec/porterrshow :
          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
  27:    0       0       0       0       0       0       0       0       2.1g    0       0       0       0       0       0       0       0       0       0

Link state record(LSR) errors reported in errdump as below where ISL port report low Rx:

2024/01/17-04:51:22 (IST), [FLOD-1007], 39239, SLOT 1 | FID 128, WARNING, H1NETZGEN6X8FQ03EC1, The LSR for reachable domain 160 reached the maximum age and has been removed from the LSDB. 2024/01/17-09:50:47 (IST), [FLOD-1007], 39244, SLOT 1 | FID 128, WARNING, H1NETZGEN6X8FQ03EC1, The LSR for reachable domain 160 reached the maximum age and has been removed from the LSDB.

ITW errros reported for the port in errdump:

2022/12/15-20:04:23, [MAPS-1003], 22076, SLOT 1 | FID 128, WARNING, Sify_X7_112_FAB2, slot3 port27, F-Port 3/27, Condition=ALL_OTHER_F_PORTS(ITW/min>21), Current Value:[ITW, 2310518947 ITWs], RuleName=defALL_OTHER_F_PORTSITW_21, Dashboard Category=Port Health. 2022/12/15-20:05:23, [MAPS-1003], 22078, SLOT 1 | FID 128, WARNING, Sify_X7_112_FAB2, slot3 port27, F-Port 3/27, Condition=ALL_OTHER_F_PORTS(ITW/min>21), Current Value:[ITW, 2061402242 ITWs], RuleName=defALL_OTHER_F_PORTSITW_21, Dashboard Category=Port Health