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On-Demand Mode

In on-demand mode, the measurements are triggered by the user through the CLI.

When the user triggers the delay measurement through the CLI, the delay measurement request that is generated is as per the frame formats specified by the ITU-T Y.1731 standard. For two-way delay measurement, the server-side processing can be delegated to the Packet Forwarding Engine to prevent overloading on the Routing Engine. For more information, see Configuring Routers to Support an ETH-DM Session. When the server-side processing is delegated to the Packet Forwarding Engine, the delay measurement message (DMM) frame receive counters and delay measurement reply (DMR) frame transmit counters are not displayed by the show command.

When the user triggers the loss measurement through the CLI, the router sends the packets in standard format along with the loss measurement TLV. By default, the session-id-tlv argument is included in the packet to allow concurrent loss measurement sessions from same local MEP. You can also disable the session ID TLV by using the no-session-id-tlv argument.

Single-ended ETH-LM is used for on-demand operation, administration, and maintenance purposes. An MEP sends frames with ETH-LM request information to its peer MEP and receives frames with ETH-LM reply information from its peer MEP to carry out loss measurements. The protocol data unit (PDU) used for a single-ended ETH-LM request is referred to as a loss measurement message (LMM) and the PDU used for a single-ended ETH-LM reply is referred to as a loss measurement reply (LMR).

 

Related Documentation

 

Published: 2012-12-11

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