Configuring MEP Direction

The direction a MEP faces is relative to the link and the bridge relay. A down-MEP sends CFM Ethernet frames towards and receives CFM Ethernet frames from the link. An up-MEP sends CFM Ethernet frames towards the bridge relay and receives CFM Ethernet frames from the bridge relay. The bridge relay sends and receives frames to the ports associated with the CFM service.

A down-MEP performs the following functions:

• Sends and receives CFM Ethernet frames at its MD level over the link connected to the port where the MEP is configured.
• Drops all CFM Ethernet frames at its MD level or lower that come from the bridge relay.
• Processes all CFM Ethernet frames at its MD level coming from the link.
• Drops all CFM Ethernet frames at a lower MD level coming from the link.
• Transparently forwards all CFM Ethernet frames at a higher MD level, regardless of whether they came from the link or the bridge relay.

An up-MEP performs the following functions:

• Transparently forwards all CFM Ethernet frames that have a higher MD level.
• Sends and receives CFM Ethernet frames with the same MD level through the bridge relay, but not over the link.
• Drops all CFM Ethernet frames at its MD level or lower that come from the link.
• Processes all CFM Ethernet frames at its MD level coming from the bridge relay.
• Drops all CFM Ethernet frames at a lower MD level coming from the bridge relay.

MEP direction defaults to down.

This example shows how to set the direction for the myMA1 MEP 1000 to up:

System(rw-config)->cfm md string-name myMD1
System(su-config-cfm-md.1)->ma string-name myMA1
System(su-config-cfm-ma.1)->mep 1000
System(su-config-cfm-mep.1000)->direction up
System(su-config-cfm-mep.1000)->enable
System(su-config-cfm-mep.1000)->