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 address of an MP, which is the SPBM system ID or the virtual SMLT MAC. MPs on the path to the target address respond with an LTR.

Note

Product Notice: This procedure does not apply to VSP 8600 Series.

Before you begin

You must have a MEP that is associated with a VLAN.

Procedure

Trigger the linktrace:

linktrace WORD<0–22> WORD<0–22> <1–8191> <0x00:0x00:0x00:0x00:0x00:0x00> [detail] [priority <0–7>] [source-mode <nodal|noVlanMac|smltVirtual>] [ttl-value <1–255>]

Example

Switch:1# linktrace md1 4001 13 00:bb:00:00:14:00 priority 7

Please wait for LTM to complete or press any key to abort

Received LTRs:

SeqNum: 10575 MD: md1 MA:4001	MepId: 	13 	Priority: 7
--------------------------------------------------------------
TTL SRC MAC					FWDYES	TERMMEP	RELAY		ACTION			
--- ------------------ ------  -------- ----------------------
63	00:bb:00:00:10:00	 	true		false		Fdb
62 	00:bb:00:00:14:00  	false		true		Hit

Variable Definitions

The following table defines parameters for the linktrace 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 target MAC address to reach the MEP.
detail	Displays linktrace result details.
priority `<0–7>`	Specifies the priority. The default is 7.
source-mode`<nodal\|noVlanMac\|smltVirtual>`	Specifies the source mode: 1: 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. 2: smltVirtual—Use this value with B-VLANs only. The default is 1: nodal.
ttl-value `<1–255>`	Specifies the Time-to-Live value. The default is 64.