Configuring 802.1ag MAC Trace

Context

Similar to IP traceroute, 802.1ag MAC trace monitors connectivity of a path between two MEPs.

802.1ag MAC trace can be only implemented on the network where the MD, MA, and MEP are configured.

Procedure

A device is usually configured with multiple MDs and MAs. To determine failure points or the forwarding path for packets sent from a MEP to another MEP, perform either of the following operations on the device with a MEP at one end of the link to be tested.
- MA view:
  1. Run system-view
    The system view is displayed.
  2. Run cfm md md-name
    The MD view is displayed.
  3. Run ma ma-name
    The MA view is displayed.
  4. Run trace mac-8021ag mep mep-id mep-id { md md-name ma ma-name { mac mac-address | remote-mep mep-id mep-id } | mac mac-address | remote-mep mep-id mep-id } [ interface interface-type interface-number | -t timeout | ttl ttl ] ^*
    A connectivity fault between the local device and the remote device is located.
  - The trace mac-8021ag command without md md-name and ma ma-name specified determines failure points or the forwarding path for packets sent from a MEP to another MEP in a specified MA.
  - The trace mac-8021ag command with md md-name and ma ma-name specified determines failure points or the forwarding path for packets sent from a MEP to another MEP based on the configured MA and MD.
- All views except the MA view:
  
  Run trace mac-8021ag mep mep-id mep-id md md-name ma ma-name { mac mac-address | remote-mep mep-id mep-id } [ interface interface-type interface-number | -t timeout | ttl ttl ] ^*
  
  A connectivity fault between the local device and the remote device is located.
When performing 802.1ag MAC trace, ensure that:
- The MA has been associated with a VLAN.
- The MEP has been configured in the MA.
- The outbound interface (if specified) cannot be the interface on which an inward-facing MEP is configured. The interface must join the VLAN associated with the MA.
- If the destination node is an RMEP, either mac mac-address or remote-mep mep-id mep-id can be specified. If remote-mep mep-id mep-id is specified, the RMEP must have been created using the remote-mep command and the bridge MAC address of the device on which the RMEP is located must be specified.
- If the destination node is a MIP, specify mac mac-address.
- If the forwarding entry of the destination node does not exist in the MAC address table, interface interface-type interface-number must be specified.