H3C SOHO IE4300, Command Reference Manual

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12
Usage guidelines
This command enables the source MEP to send LTMs when it fails to receive CCMs from the target
MEP within 3.5 times the sending interval. The destination of the LTMs is the target MEP, and the
TTL field value is 255. Based on the returned LTRs, the fault source can be located on the faulty link.
If you disable automatic LTM sending, the content stored in the buffer will be removed.
Examples
# Enable automatic LTM sending, and set the size of the buffer used to store the auto-detection
result to 100 (in terms of auto-detection times).
<Sysname> system-view
[Sysname] cfd linktrace auto-detection size 100
Related commands
cfd linktrace
display cfd linktrace-reply auto-detection
cfd loopback
Use
cfd loopback
to enable loopback (LB).
Syntax
cfd loopback service-instance instance-id mep mep-id { target-mac
mac-address | target-mep target-mep-id } [ number number ]
Views
Any view
Predefined user roles
network-admin
Parameters
service-instance instance-id
: Specifies a service instance by its ID in the range of 1 to
32767.
mep mep-id
: Specifies the source MEP by its ID in the range of 1 to 8191.
target-mac mac-address
: Specifies the destination MAC address of the MP, in the format of
H-H-H.
target-mep target-mep-id
: Specifies the target MEP by its ID in the range of 1 to 8191.
number number : Specifies the number of the sent LBMs packets. The value is in the range of 1 to
10. The default value is 5.
Usage guidelines
The LB function verifies link connectivity between the source MEP and the target MP by using LBMs
and LBRs.
Examples
# Enable LB for the link between MEP 1101 and MEP 2001 in service instance 1 (assume that the
link status is normal).
<Sysname> cfd loopback service-instance 1 mep 1101 target-mep 2001
Loopback to MEP 2001 with the sequence number start from 1101-43404:
Reply from 0010-fc00-6512: sequence number=1101-43404 Time=5ms
Reply from 0010-fc00-6512: sequence number=1101-43405 Time=5ms