H3C Technologies H3C S7500E Series Switches - Manual (Page 29)

3-10
z Ethernet OAM remote loopback is available only after the Ethernet OAM connection is
established and can be performed only by the Ethernet OAM entities operating in active Ethernet
OAM mode.
z Remote loopback is available only on full-duplex links that support remote loopback at both ends.
z Ethernet OAM remote loopback needs the support of the peer hardware.
z Enabling Ethernet OAM remote loopback interrupts data communications. After Ethernet OAM
remote loopback is disabled, all the ports involved will shut down and then come up. Ethernet
OAM remote loopback is disabled when you execute the undo oam enable command to disable
Ethernet OAM, when you execute the undo oam loopback command to disable Ethernet OAM
remote loopback, or when the Ethernet OAM connection times out.
z Ethernet OAM remote loopback is only applicable to individual links. It is not applicable to link
aggregation member ports or service loopback group member ports. In addition, you cannot
assign ports where Ethernet OAM remote loopback is being performed to link aggregation groups
or service loopback groups. For more information about link aggregation groups and service
loopback groups, refer to Ethernet Link Aggregation Configuration and Service Loopback Group
Configuration in the Layer 2 - LAN Switching Configuration Guide.
z Enabling internal loopback test on a port in remote loopback test can terminate the remote
loopback test. For more information about loopback test, refer to Ethernet Port Configuration in
the Layer 2 - LAN Switching Configuration Guide.
Displaying and Maintaining Ethernet OAM Configuration
To do… Use the command… Remarks
Display global Ethernet OAM
configuration
display oam configuration
Display the statistics on critical
events after an Ethernet OAM
connection is established
display oam critical-event
[ interface interface-type
interface-number ]
Display the statistics on Ethernet
OAM link error events after an
Ethernet OAM connection is
established or after you clear the
statistics
display oam link-event { local |
remote } [ interface interface-type
interface-number ]
Display the information about an
Ethernet OAM connection
display oam { local | remote }
[ interface interface-type
interface-number ]
Available in any view