Alcatel-Lucent 7705 Service Manual page 72

ETH-CFM (802.1ag and Y.1731)
In order to process LBMs at wire speed, there must be either no TLVs or a single TLV
(which is a Data TLV) in the LBM frame. The End TLV field (0) must be present and the
frame can be padded with data after the End TLV field in order to increase the size of the
frame. Note, however, that the MAC address cannot be a multicast MAC address; it must be
the MEP MAC destination address (DA).
Datapath processing of LBMs is supported for the following MEPs:
For spoke SDP Down MEPs, fastpath (datapath) LBM processing requires that both
interfaces—the LBM receiver and the LBR transmitter—reside on the same adapter card.
For example, if the 7705 SAR must perform a reroute operation and needs to move the next-
hop interface to another adapter card (that is, LBMs are received on one card and LBRs are
transmitted on another), then the fastpath processing of LBMs is terminated and LBM
processing continues via the CSM.
Continuity Check (CC)
The continuity check function is supported by 802.1ag and Y.1731 on the 7705 SAR. A
Continuity Check Message (CCM) is a multicast frame that is generated by a MEP and sent
to its remote MEPs in the same MA. The CCM does not require a reply message. To identify
faults, the receiving MEP maintains a MEP database with the MAC addresses of the remote
MEPs with which it expects to maintain connectivity checking. The MEP database can be
provisioned manually. If there is no CCM from a monitored remote MEP in a preconfigured
period, the local MEP raises an alarm.
The following CC capabilities are supported:
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• dot1ag
→ SAP Up MEP
→ SAP Down MEP
→ spoke SDP Down MEP
• Y.1731
→ SAP Up MEP
→ SAP Down MEP
• enable and disable CC for a MEP
• automatically put local MEPs into the database when they are created
• manually configure and delete the MEP entries in the CC MEP monitoring database.
Note that the only local provisioning required to identify a remote MEP is the
remote MEP identifier (using the remote-mepid mep-id command).
• CCM transmit interval: 10ms, 100ms, 1s, 10s, 1m, 10m (default: 10s)
• transmit interval: 10ms, 100ms, 1s, 10s, 1m, 10m (default: 10s)
7705 SAR OS Services Guide