Ethernet OAM 802.1ag MAC Trace Fails

Procedure

1. Run the display this command in the MD view on the source node and destination node to check whether MEP levels of the source node and destination node are the same.

   • If yes, go to step 2.

   • If not, delete the MD, run the cfm md command to create a new one, and set the MEP level of the destination node to be the same as that of the source node.

     • If the source node successfully traces the MAC address of the destination node based on 802.1ag, the fault has been rectified.

     • If the source node fails to trace the MAC address of the destination node based on 802.1ag, go to step 2.

2. Run the display cfm mep command to check whether the MEP level of the intermediate node is the same as or higher than the MEP level of the source node.
   

   802.1ag packets in low-level MDs cannot pass through high-level MDs, whereas 802.1ag packets in high-level MDs can pass through low-level MDs. 802.1ag packets with the same level of the MD cannot traverse the MDs.

   • If not, go to step 3.

   • If yes, delete the MD, run the cfm md command to create a new one, and change the MEP level on the intermediate node.

     • If the source node successfully traces the MAC address of the destination node based on 802.1ag, the fault has been rectified.

     • If the source node fails to trace the MAC address of the destination node based on 802.1ag, go to step 3.

3. Run the display mac-address dynamic [ slot-id ] [ interface-type interface-number | vlan vlan-id ] command to check whether the intermediate node has a MAC address entry with the destination node.

   If not, run the ping mac-8021ag command to enable the intermediate node to learn the MAC address of the destination node.

   If the source node successfully traces the MAC address of the destination node based on 802.1ag, the fault has been rectified.