Cfd Loopback - 3Com S7906E Command Reference Manual

After LT messages automatic sending is enabled, if a MEP fails to receive the CCMs from the
remote MEP, the link between the two is regarded as faulty and LTMs will be sent out. (The
destination of the LTMs is the remote MEP, and the maximum value of TTL is 255.) Based on the
LTRs that echo back, the fault source can be located.
Once you disable LT messages automatic sending, the content stored in the buffer will be
removed.
Related commands: cfd linktrace.
Examples
# Enable automatic LT messages sending.
<Sysname> system-view
[Sysname] cfd linktrace auto-detection

cfd loopback

Syntax
cfd loopback service-instance instance-id mep mep-id { target-mep target-mep-id | target-mac
mac-address } [ number loopback-number ]
View
System view
Default level
2: System level
Parameters
service-instance instance-id: Specifies the service instance ID, ranging from 1 to 32767.
mep mep-id: Specifies the ID of a MEP, ranging from 1 to 8191.
target-mep target-mep-id: Specifies the ID of the destination MEP for LBM packets, ranging from 1 to
8191.
target-mac mac-address: Specifies the destination MAC address, in the format of H-H-H.
number loopback-number: Specifies the number of the LBMs packets sent, ranging from 1 to 10 and
defaulting to 5.
Description
Use the cfd loopback command to enable LB function so that LBMs can be sent from the specified
MEP to other MEPs in the same service instance, and LBR messages can be received.
By default, LB is not enabled.
Examples
# Enable LB to check link state.
<Sysname> system-view
[Sysname] cfd loopback service-instance 1 mep 1101 target-mep 2001
Loopback to 0010-FC00-6512 with the sequence number start from 1101-43404:
Reply from 0010-FC00-6512: sequence number=1101-43404
Reply from 0010-FC00-6512: sequence number=1101-43405
1-5