H3C Technologies H3C S12500 Series Switches - Manual (Page 26)

15
Enabling OAM remote loopback
Enabling Ethernet OAM remote loopback
CAUTION:
Because enabling Ethernet OAM remote loopback impacts other services, use this function with caution.
When you enable Ethernet OAM remote loopback on a port, the port sends Loopback Control
OAMPDUs to a remote port, and the remote port enters the loopback state. The port then sends test
frames to the remote port. By observing how many of these test frames return, you can calculate the
packet loss ratio on the link and evaluate the link performance.
You can enable Ethernet OAM remote loopback on a specific port in user view, system view, or Layer 2
Ethernet port view. The configuration effects are the same.
When you enable Ethernet OAM remote loopback, follow these guidelines:
• Ethernet OAM remote loopback is available only after the Ethernet OAM connection is established
and can be performed only by Ethernet OAM entities operating in active Ethernet OAM mode.
• Remote loopback is available only on full-duplex links that support remote loopback at both ends.
• Ethernet OAM remote loopback must be supported by both the remote port and the sending port.
• 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 can be disabled by any of the following events: executing the undo oam enable
command to disable Ethernet OAM, executing the undo oam loopback interface or undo oam
loopback command to disable Ethernet OAM remote loopback, and Ethernet OAM connection
timing out.
• Ethernet OAM remote loopback is only applicable to individual links. It is not applicable to link
aggregation member ports. In addition, you cannot assign ports where Ethernet OAM remote
loopback is being performed to link aggregation groups. For more information about link
aggregation groups, see Layer 2—LAN Switching Configuration Guide.
• Enabling internal loopback test on a port in remote loopback test can terminate the remote
loopback test. For more information about loopback test, see Interface Configuration Guide.
To enable Ethernet OAM remote loopback in user view:
Task Command Remarks
Enable Ethernet OAM remote
loopback on a specific port. oam loopback interface
interface-type interface-number
Disabled by default.
To enable Ethernet OAM remote loopback in system view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable Ethernet OAM remote
loopback on a specific port. oam loopback interface
interface-type interface-number
Disabled by default.
To enable Ethernet OAM remote loopback in Layer 2 Ethernet port view: