Skip to main content
NetApp Knowledge Base

Invalid Transmitted Words (ITW) errors are reported on Brocade switch port

Views:
8,867
Visibility:
Public
Votes:
8
Category:
fabric-interconnect-and-management-switches
Specialty:
brocade
Last Updated:

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

 

  • Errdump reports RuleName=defALL_HOST_PORTSITW_21 getting 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.

 

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.