Cisco Cisco Nexus B22 Blade Fabric Extender Troubleshooting Guide

Contributed by Prashanth Krishnappa, Cisco TAC Engineer.
Jul 19, 2013

This document describes the interoperability problem seen with Hewlett−Packard (HP) Pass−Thru modules
and Cisco Nexus 5000 Series switches and also provides a solution to the problem.

There is a problem encountered after the Nexus 5000 with 2232 (woodside Fabric Extender (FEX)) is
upgraded to Release 5.2. When the 2232 interfaces connect to 10Gb HP Pass−Thru modules, they flap
continually and eventually error disable:

Eth152/1/1 2 eth trunk down linkFlapErrDisabled 10G(D) 1001

Eth152/1/2 2 eth trunk down linkFlapErrDisabled 10G(D) 1002

Eth152/1/3 2 eth trunk down linkFlapErrDisabled 10G(D) 1003

Eth152/1/4 2 eth trunk down linkFlapErrDisabled 10G(D) 1004

Eth152/1/5 2 eth trunk down linkFlapErrDisabled 10G(D) 1005

Eth152/1/9 2 eth trunk down linkFlapErrDisabled 10G(D) 1009

There is a known HP 10Gb Pass−Thru module link flap issue documented on the HP website, and they
recommend that customers upgrade to version 1.0.7.0. So far in all of the cases, the HP 10Gb Pass−Thru
firmware is 1.0.1.6. 

Note: The Pass−Thru module firmware is independent of the HP Onboard Adminstrator (OBA) version.

In order to determine the Pass−Thru module firmware, enter the show interconnect info 11 command:

1. Ethernet 

Product Name: HP 10GbE Pass−Thru Module

Width: Single

URL to Management interface: 

In−Band IPv4 Address: 0.0.0.0

User Assigned Name: 

Part Number: 538113−B21

Spare Part Number: 504624−001

Serial Number: MY31104WWTTemperature Sensor: Present

JS2 Connector: Absent

Internal Ethernet Interface to OA: Absent

Internal Ethernet Route to OA: Enabled

Internal Serial Interface to OA: Present