Creating an MD

This section describes how to create a maintenance domain (MD).

Context

You can create different MDs for different network ranges to isolate faults. IEEE Standard 802.1ag-2007 defines the following MD formats to indicate special MDs:

no-md-name: The MAID field in a sent continuity check message (CCM) does not carry an MD name.
dns-md-format-name: The MD information in the MAID field in a sent CCM is a character string obtained from a domain name service (DNS) text.
mac-md-format-name: The MD information in the MAID field in a sent CCM consists of a 6-byte Media Access Control (MAC) address and a 2-byte integer ranging from 0 to 65535.
string: The MD information in the MAID field in a sent CCM is a character string.

Perform the following steps on each NetEngine 8000 F on which CFM needs to be deployed:

Procedure

Run system-view
The system view is displayed.
Run cfm md md-name [ format { no-md-name | dns dns-md-format-name | mac-address mac-md-format-name | string string-md-format-name } ] [ level level ]
An MD is created, and the MD view is displayed.

To create multiple MDs, repeat this step. Each device supports a maximum of 64 MDs.

CFM packets in low-level MDs cannot pass through identical- or high-level MDs, whereas CFM packets in high-level MDs can pass through low-level MDs.
(Optional) Run senderid-tlv-type { { chassis | chassis-manage } [ chassis-subtype { mac-address | locally-assigned } ] | defer | manage | none }
The type of the sender ID TLV in a CFM packet is configured.
Run commit
The configuration is committed.