Configure a Layer 2 Tracetree

Note

Note

This procedure does not apply to XA1400 Series.

Use this procedure to configure a Layer 2 Tracetree. This feature enables CFM to debug Layer 2. Layer 2 Tracetree allows a user to trigger a multicast LTM message by specifying the B-VLAN and I-SID. The command allows the user to view a multicast tree on the SPBM B-VLAN from the source node to the destination nodes for a particular I-SID.

Note

Note

Troubleshooting using ping and traceroute (including Layer 2 ping and Layer 2 traceroute) is not supported on EDM. For more information, see Release Notes for VOSS. As an alternative, use CLI.

If you configure IsTraceTree to false, then EDM performs Traceroute on the unicast path. If you configure IsTraceTree to true, then EDM performs TraceTree on the multicast tree.

Note

Note

This command is supported on SPBM B-VLANs only, not C-VLANs.

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.

Procedure

  1. In the navigation pane, expand Configuration > Edit > Diagnostics.
  2. Select L2Ping/L2Trace Route.
  3. From the L2 Traceroute/TraceTree tab, configure the Layer 2 tracetree properties.
  4. In the IsTraceTree field double-click and select true for EDM to perform Tracetree on the multicast tree.
  5. Select Apply.
  6. Select Refresh to update the results.

L2Tracetree Field Descriptions

Use the data in the following table to use the L2Tracetree tab.

Name

Description

VlanId

Identifies the Backbone VLAN.

Priority

Specifies a 3–bit value to be used in the VLAN header, if present in the transmitted frame. The default is 7.

DestMacAddress

Specifies the target MAC address.

HostName

Specifies the target host name.

DestIsHostName

Indicates whether the host name is (true) or is not (false) used for L2Tracetree transmission.

Isid

Specifies the service instance identifier (I-SID).

IsTraceTree

Specifies whether the multicast tree or unicast path is traced. If you configure IsTraceTree to false then EDM performs Traceroute on the unicast path. If you configure IsTraceTree to true then EDM performs TraceTree on the multicast tree.

Status

Specifies the status of the transmit loopback service:

  • ready: the service is available.

  • transmit: the service is transmitting, or about to transmit, the L2Tracetree messages.

  • abort: the service aborted or is about to abort the L2Tracetree messages.

This field is also used to avoid concurrency or race condition problems that can occur if two or more management entities try to use the service at the same time.

The default is ready.

ResultOk

Indicates the result of the operation:

  • true: the L2Tracetree Messages will be (or have been) sent.

  • false: the L2Tracetree Messages will not be sent

The default is true.

Ttl

Specifies the Time-to-Live value. Indicates the number of hops remaining to this L2Tracetree. The tracetree is decremented by one by each bridge that handles the Layer 2 tracetree and the decremented value is returned to the tracetree. If the output is 0, then the L2Tracetree is not transmitted to the next hop. The value of the TTL field in the L2Tracetree is transmitted by the originating MEP is controlled by a managed object. The default is 64.

SourceMode

Specifies the source mode of the transmit loopback service:

  • 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 the smltVirtual option with B-VLANs only.

The default is nodal.

SeqNumber

The transaction identifier/sequence number of the first loopback message (to be) sent. The default is 0.

Flag

Specifies the L2Tracetree result flag, which indicates the L2Tracetree status or error code. Each sum represents a status or error:

  • 1 — No error

  • 2 — L2Tracetree internal error

  • 3 — Invalid MAC address

  • 4 — MEP must be enabled in order to perform L2Tracetree

  • 5 — No L2Tracetree response received

  • 6 — L2Tracetree to own MEP MAC is not sent

  • 7 — L2Tracetree completed

  • 8 — Lookup failure for L2Tracetree

  • 9 — On a leaf node in the I-SID tree

  • 10 — Not in the I-SID tree

  • 11 — Requested SMLT source from nonprimary node