Invalid Transmitted Words (ITW) errors are reported on Brocade switch port
Applies to
- SAN
- Brocade
- Fabric MetroCluster
- ONTAP 9
Issue
- Invalid Transmitted Words (ITW) port counter is high and incrementing on a Brocade switch port:
brocade_switch> portshow
Example:
portshow 9
..
Interrupts: 134 Link_failure: 3 Frjt: 0
Unknown: 0 Loss_of_sync: 7 Fbsy: 0
Lli: 1224 Loss_of_sig: 0
Proc_rqrd: 253 Protocol_err: 0
Timed_out: 0 Invalid_word: 23044
Tx_unavail: 0 Invalid_crc: 0
Delim_err: 0 Address_err: 0
Lr_in: 2 Ols_in: 0
Lr_out: 0 Ols_out: 32
- Porterrshow reports mutliple errors like crc error, crc g_eof , enc_out , c3 Tx discards as shown in the below snippet:
/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
155: 165.9g 6.3g 9.5k 8.0k 7.3k 0 0 758 795.5m 111 0 0 0 0 0 106 0 0 0
ErrdumpreportsRuleName=defALL_HOST_PORTSITW_21getting trggered due to these ITW errors reporte din huge number:
Errdump:
2022/12/12-19:20:16, [MAPS-1003], 769558, SLOT 2 | FID 128, WARNING, switchXX, slot3 port29-Host.LINUX:CBXPR_APP02.ALIAS:HBCBXPRDAP02_HBA2:VSP5, F-Port 3/29, Condition=ALL_HOST_PORTS(ITW/min>21), Current Value:[ITW, 521 ITWs], RuleName=defALL_HOST_PORTSITW_21, Dashboard Category=Port Health.
2022/12/12-19:21:16, [MAPS-1003], 769561, SLOT 2 | FID 128, WARNING, switchXX, slot3 port29-Host.LINUX:CBXPR_APP02.ALIAS:HBCBXPRDAP02_HBA2:VSP5, F-Port 3/29, Condition=ALL_HOST_PORTS(ITW/min>21), Current Value:[ITW, 824 ITWs], RuleName=defALL_HOST_PORTSITW_21, Dashboard Category=Port Health.
2022/12/12-19:22:16, [MAPS-1003], 769562, SLOT 2 | FID 128, WARNING, switchXX, slot3 port29-Host.LINUX:CBXPR_APP02.ALIAS:HBCBXPRDAP02_HBA2:VSP5, F-Port 3/29, Condition=ALL_HOST_PORTS(ITW/min>21), Current Value:[ITW, 1422 ITWs], RuleName=defALL_HOST_PORTSITW_21, Dashboard Category=Port Health.
