Trigger Linktrace
Before you begin
On the source and destination nodes, you must configure a CFM MD, MA, and MEP.
Enable the MEP.
Assign a nodal MEP to the B-VLAN.
About this task
Use the following procedure to trigger a linktrace. The link trace 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.
Procedure
- In the navigation pane, expand .
- Select CFM.
- Select the LTM tab.
- Configure the linktrace test properties as required.
- Select Apply.
-
To trigger the
linktrace test, perform one of the following actions:
- In Status, select transmit, and then select Apply
- Highlight an entry, and then select Start.
- To update the linktrace, select the Refresh button.
- To stop the linktrace, select Stop.
LTM Field Descriptions
Use the data in the following table to use the LTM tab.
Name |
Description |
---|---|
DomainIndex |
Specifies the MD index value. |
AssociationIndex |
Specifies the MA index value. |
Index |
Specifies the MEP index value. |
DomainName |
Specifies the MD name. |
AssociationName |
Specifies the MA name. |
VlanPriority |
Specifies the VLAN priority, a 3–bit value to be used in the VLAN tag, if present in the transmitted frame. The default is 7. |
DestMacAddress |
Specifies the remote MAC address to reach the MEP. |
Ttl |
Indicates the number of hops remaining to this LTM. This value is decremented by 1 by each bridge that handles the LTM. The decremented value is returned in the LTR. If the value is 0 on output, the LTM is not transmitted to the next hop. The value of the TTL field in the LTM is specified at the originating MEP. The default value is 64. |
SeqNumber |
Specifies the transaction identifier/sequence number of the first loopback message (to be) sent. The default is 0. |
ResultOk |
Indicates the result of the operation:
The default is true. |
Status |
Indicates the status of the transmit loopback service:
The default is ready. |
Flag |
Displays the LTM result flag indicating LTM status or error code. Each value represents a status or error case:
|
SourceMode Note:
Exception: smltVirtual is not supported on 5320 Series. |
Specifies the source mode of the transmit loopback service:
The default is nodal. |