H3C Technologies H3C S7500E Series Switches - Manual (Page 40)

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Linktrace
Linktrace is responsible for identifying the path between the source MEP and the destination MEP.
This function is implemented in the following way: the source MEP multicasts linktrace messages
(LTMs) to the destination MEP. After receiving the messages, the destination MEP and the MIPs that
the LTMs pass send back linktrace reply messages (LTRs) to the source MEP. Based on the reply
messages, the source MEP can identify the path to the destination MEP. Note that LTMs are multicast
frames while LTRs are unicast frames.
Protocols and Standards
The CFD function is implemented in accordance with IEEE 802.1ag: Virtual Bridged Local Area
Networks Amendment 5: Connectivity Fault Management.
CFD Configuration Task List
For CFD to work properly, you should first design the network by performing the following tasks:
z Grade the MDs in the entire network, and define the boundary of each MD.
z Assign a name for each MD. Make sure that the same MD has the same name on different
devices.
z Define the MA in each MD according to the VLAN you want to monitor.
z Assign a name for each MA. Make sure that the same MA in the same MD has the same name on
different devices.
z Determine the MEP list of each MA in each MD. Make sue that devices in the same MA maintain
the same MEP list.
z At the edges of MD and MA, MPs should be designed at the device port. MEPs can be designed
on devices or ports that are not at the edges.
Complete the following tasks to configure CFD:
Tasks Remarks
Enabling CFD Required
Configuring the CFD Protocol
Version
Optional
Configuring Service Instances Required
Configuring MEPs Required
Configuring Basic CFD Settings
Configuring MIP Generation Rules Required
Configuring CC on MEPs Required
Configuring LB on MEPs Optional Configuring CFD Functions
Configuring LT on MEPs Optional