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Cisco Bug: CSCup59194 - Barra: Interface speed set to unknown [Cisco VIC issue]

Last Modified

May 05, 2016

Products (1)

  • Cisco Nexus 1000V Switch for VMware vSphere

Known Affected Releases


Description (partial)

With Cisco UCS VIC 1280 on UCS blade servers used for Nexus1000V VEM hosts, one may observe interface speed set to 'unknown' with following syslog on VSM:
2014 Jun 13 14:30:31 vsm-p %USER-2-SYSTEM_MSG: unknown enum:20000, tid(hex):22a01a0, comp:41, cid(hex):b0 - vsh

This happens with VEM hosts running Cisco UCS B-22 M3 blades with Cisco UCS VIC 1280 capable of carrying 20Gbps on an individual link. This information can be seen as part of ethtool output as below:

root@network-2:~# ethtool eth1
Settings for eth1:
        Supported ports: [ FIBRE ]
        Supported link modes:   10000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: No
        Advertised link modes:  10000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 20000Mb/s                       <<<<<<<<<<<<
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: off
        Current message level: 0x00000000 (0)
        Link detected: yes
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