Troubleshooting Guide

Variable definitions
Use the data in the following table to use the loopback command.
Variable Value
WORD<0–22> The first parameter, specifies the MD name.
WORD<0–22> The second parameter, specifies the MA name.
<1–8191> Specifies the MEP ID.
<0x00:0x00:0x00:0x00:0x00:0x00> Specifies the remote MAC address to reach the MEP/MIP.
burst-count <1–200> Specifies the burst-count.
data-tlv-size <0–400> Specifies the data TLV size.
frame-size <64–1500> Specifies the frame-size. The default is 0.
priority <<0–7> Specifies the priority. The default is 7.
source-mode <nodal|noVlanMac|
smltVirtual>
Specifies the source mode:
• nodal
• noVlanMac — Use this value with C-VLAN only. When you
select this option, even if a VLAN MAC address exists, the
system uses the CFM C-MAC as the BMAC-SA.
• smltVirtual — Use this value with B-VLANs only.
The default is nodal.
testfill-pattern {all-zero|all-zero-crc|
pseudo-random-bit-sequence|pseudo-
random-bit-sequence-crc}
Specifies the testfill pattern:
• all-zero — null signal without cyclic redundancy check
• all-zero-crc — null signal with cyclic redundancy check with
32-bit polynomial
• pseudo-random-bit-sequence — pseudo-random-bit-sequence
without cyclic redundancy check
• pseudo-random-bit-sequence-crc — pseudo-random-bit-
sequence with cyclic redundancy check with 32-bit polynomial.
A cyclic redundancy check is a code that detects errors.
The default is 1: all-zero.
time-out <1–10> Specifies the time-out interval in seconds. The default is 3.
Triggering linktrace (LTM)
Use the following procedure to trigger a linktrace.
The Linktrace Message is often compared to traceroute. An MEP transmits the Linktrace Message
packet to a maintenance endpoint with intermediate points responding to indicate the path of the
traffic within a domain for the purpose of fault isolation. The packet specifies the target MAC
CFM configuration using ACLI
January 2017 Troubleshooting 169
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