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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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An Electrical Interface Cannot Go Up

An Electrical Interface Cannot Go Up

Fault Description

An electrical interface cannot go up physically. The interface status is as follows:

<HUAWEI> display interface 10ge 1/0/6
10GE1/0/6 current state :  (ifindex: 10)
Line protocol current state : 
Description:
Switch Port, PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9e95-7c10
Port Mode:    COMMON COPPER,     Port Split/Aggregate:         DISABLE
Speed:                10000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                   ENABLE
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE
Mdi:                      -,     Fec:                                -
Last physical up time   : -
Last physical down time : 2013-04-09 16:27:40

Common Causes

  • The power cable is faulty.
  • Negotiation between the local and remote interfaces fails.
  • The duplex modes of the local and remote interfaces are different.

Troubleshooting Procedure

  1. Check the cable status. Run the virtual-cable-test command in the interface view to check the cable status. If the cable status is displayed as Open or Short rather than OK, replace the cable.
  2. Check the auto-negotiation configuration of the local and remote interfaces.
    • If the remote interface works in auto-negotiation mode, run the restart command in the local interface view to restart the interface.
    • If the remote interface works in non-auto negotiation mode and has a rate configured, run the speed { 10 | 100 | 1000 } or speed { 100 | 1000 | 10000 } command in the local interface view to configure the same rate as that of the remote interface.
  3. Check the duplex mode configuration of the local and remote interfaces.

    Only 10GE electrical interfaces of the CE6850-48T4Q-EI can be configured to work in half-duplex mode. Interfaces of CloudEngine 8800&7800&6800&5800 series switches can only work in full-duplex mode. Duplex modes of interfaces on both ends must be the same; otherwise, interfaces cannot go Up.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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