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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Enabling GMAC Trace to Locate Faults

Enabling GMAC Trace to Locate Faults


Similar to IP traceroute, GMAC ping detects whether a fault occurs on an Ethernet link or monitors the link quality. GMAC trace efficiently detects and locates Ethernet faults.

GMAC trace is applicable to the network where no MD, MA, or MEP is configured.


  1. Configure the devices on both ends of a link and the intermediate device.

    Perform the following operations on the devices at both ends of the link to be tested and intermediate device.

    1. Run the system-view command to enter the system view.
    2. Run the trace mac enable to enable GMAC trace globally.

      By default, GMAC trace is enabled.

      After GMAC ping is enabled on the device, the device can ping the remote device and respond to received GMAC ping packets.

  2. Perform GMAC trace.

    Perform the following operations on the device at one end of the link to be tested.

    1. Run the system-view command to enter the system view.
    2. Run the trace mac mac-address vlan vlan-id [ interface interface-type interface-number | -t timeout | -h ]* command to enable the device to locate connectivity faults between the local and remote devices.

      A MEP is not required to initiate GMAC trace. The destination node cannot be a MEP or MIP. That is, GMAC trace can be implemented without configuring the MD, MA, or MEP on the source device, intermediate device, and destination device. All the intermediate devices can respond with an LTR.

      The two devices must be configured with IEEE 802.1ag of the same version. If the local device is configured with IEEE 802.1ag Draft 7 and the remote device is configured with IEEE Standard 802.1ag-2007, the trace mac command does not take effect. That is, the connectivity fault cannot be located.

Updated: 2019-10-18

Document ID: EDOC1000178310

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