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DGS-3120 Series Managed Switch CLI Reference Guide 
195 
 
<string 22> - Enter the maintenance association name her. This name can be up to 22 
characters long. 
ma_index - Specify the maintenance association index. 
<uint 1-4294967295> - Enter the maintenance association index value here. This value 
must be between 1 and 4294967295. 
num - (Optional) Number of LBMs to be sent. The default value is 4. 
<int 1-65535> - Enter the number of LBMs to be sent here. This value must be between 1 and 
length - (Optional) The payload length of the LBM to be sent. The default is 0. 
<int 0-1500>
 - Enter the payload length here. This value must be between 0 and 1500. 
pattern - (Optional) An arbitrary amount of data to be included in a Data TLV, along with an 
indication whether the Data TLV is to be included. 
<string 1500> - Enter the pattern used here. This value can be up to 1500 characters long. 
pdu_priority - (Optional) The 802.1p priority to be set in the transmitted LBMs. If not specified, it 
uses the same priority as CCMs and LTMs sent by the MA. 
<int 0-7> - Enter the PDU priority value here. This value must be between 0 and 7. 
 
Restrictions 
Only Administrator, Operator and Power-User level users can issue this command. 
 
Example 
To transmit a LBM: 
DGS-3120-24TC:admin# cfm loopback 00-01-02-03-04-05 mepname mep1 
Command: cfm loopback 00-01-02-03-04-05 mepname mep1 
 
Request timed out. 
Request timed out. 
Reply from MPID 52: bytes=xxx time=xxxms 
Request timed out. 
 
CFM loopback statistics for 00-01-02-03-04-05: 
    Packets: Sent=4, Received=1, Lost=3(75% loss). 
 
DGS-3120-24TC:admin# 
 
19-18  cfm linktrace 
Description 
This command is used to issue a CFM link track message. 
 
Format 
cfm linktrace <macaddr> [mepname <string 32> | mepid <int 1-8191> md [<string 22> | 
md_index <uint 1-4294967295>] ma [<string 22> | ma_index <uint 1-4294967295>]] {ttl <int 2-
255> | pdu_priority <int 0-7>} 
 
Parameters 
<macaddr> - Specify the destination MAC address. 
mepname - Specify the MEP name used.