Cisco: End devices encounter errors or do not respond after MDS Fabric switch ISSU

Summary: End device FC port directly attached to an MDS Fabric switch goes to errored state after ISSU/ISSD activity. Conditions: This issue applies to the following fabric switches only: Cisco MDS 9132T Cisco MDS 9148S Cisco MDS 9148T Cisco MDS 9220i Cisco MDS 9396S Cisco MDS 9396T Further, the ISSU/ISSD is between any two of the following Cisco NX-OS versions: 8.4(1), 8.4(1a) 8.4(2), 8.4(2a), 8.4(2b), 8.4(2c) 8.5(1) ...

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Symptoms

End device FC port directly attached to an MDS Fabric switch go to errored state after ISSU/ISSD performed on the switch.

This has been noted on departmental level switches (non-director class) directly connected to any GeoSynchrony code level on VPLEX VS6 only.

This issue is due to the open FCNS PLOGI connections not being restored correctly on the MDS switch after ISSU/ISSD. As a result, when the locally attached end device next queries the FCNS, instead of sending a reply the MDS send an FCNS PLOGI request to the end device. The end device may not handle this second connection request well and go to an unknown or errored state.

Cause

Cisco bug CSCvz09012

Resolution

Fix:
Upgrade to NX-OS 8.4(2d) or higher.

Workaround:
2 (disruptive) workarounds are available -

The issue is addressed by either:

  1. Manual reload of the switch AFTER the upgrade has been completed, OR

  2. Shut the VPLEX ports associated to switch PRIOR to the upgrade, and bring up after upgrade has been completed  


For further reference, please browse Dell DTA 193590

Additional Information

10/21 - changed "This has been noted on departmental level switches (non-director class) directly connected to any GeoSynchrony code level on VPLEX VS6" to "This has been noted on departmental level switches (non-director class) directly connected to any GeoSynchrony code level on VPLEX VS6 only." per Vplex John R

Affected Products

Connectrix MDS-9132T, Connectrix MDS-9148S, Connectrix MDS-9148T, Connectrix MDS-9220i, Connectrix MDS-9396S, Connectrix MDS-9396S PSI, Connectrix MDS-9396T

Products

VPLEX GeoSynchrony
Article Properties
Article Number: 000192572
Article Type: Solution
Last Modified: 24 فبراير 2026
Version:  7
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