H3C Technologies H3C S7500E Series Switches - Manual (Page 41)

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z Normally, a port blocked by STP cannot receive, send, or respond to CFD messages. However, if
it is configured as an outward-facing MEP, it can still receive and send CCM messages.
z Only Ethernet ports support CFD.
Configuring Basic CFD Settings
Enabling CFD
Enable CFD on all concerned devices.
Follow these steps to enable CFD on a device:
To do... Use the command... Remarks
Enter system view system-view —
Enable CFD cfd enable
Required
CFD is disabled by default.
Configuring the CFD Protocol Version
Three CFD protocol versions are available: IEEE 802.1ag draft5.2 version and IEEE 802.1ag standard
version. Devices in a same MD must use the same CFD protocol version; otherwise, they cannot
exchange CFD protocol packets.
Follow these steps to configure the CFD protocol version:
To do... Use the command... Remarks
Enter system view system-view —
Configure the CFD protocol
version
cfd version { draft5 | standard }
Optional
By default, CFD uses the standard
version of IEEE 802.1ag.
Configuring Service Instances
Before configuring the MEPs and MIPs, you must first configure service instances.
A service instance is indicated by an integer to represent an MA in an MD. The MD and MA define the
level and VLAN attribute of the messages handled by the MPs in a service instance.
Follow these steps in strict order to configure a service instance: