Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) - Manual (Page 223)

Multi-Service IronWare Administration Guide 205
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IPv6 Traceroute over an MPLS network
6
The microsec column is the round trip time (sum of the time) to and from the previous hop. For
example, 316 microsec for hop 1 is the time from the source to hop 1 and from hop 1 to the source.
One way time is not available because the tracel2 protocol does not synchronize the clocks
between hops.
The comment column shows the Layer 2 protocol used on the input port. It could be the following:
• STP – spanning tree protocol
• RSTP – Rapid STP, 802.1w draft 3
• 802.1w – Rapid STP
• ring – Metro ring ID of input port.
• Single STP – Includes Single STP, Single RSTP and Single 802.1w
• STP port disabled – The spanning-tree ethernet disabled command is configured.
• route-only – This device has route-only configuration
• port route-only – The input port has route-only configuration
Displaying Layer 2 topology information
To display information about the Layer 2 topology, first issue a trace-l2 vlan command, then enter
the trace-l2 show command as in the following example.
The trace-l2 show command does not display a path if the path is a subset of another path;
therefore, the number of paths displayed could be fewer than the number of devices.
If the topology contains Layer 2 loops, a message such as the following is displayed.
Syntax: trace-l2 show
IPv6 Traceroute over an MPLS network
NOTE
IPv6 MPLS traceroute not supported on the BR-MLX-10Gx24-DM 24-port 10GbE module.
Brocade(config)#trace-l2 vlan 10
Vlan 10 L2 topology probed, use "trace-l2 show" to display
Brocade(config)#trace-l2 show
Vlan 10 L2 topology was probed 6 sec ago, # of paths: 2
path 1 from e27, 1 hops:
hop input output IP and/or MAC address microsec comment
1 e13 10.1.1.1 0000.0057.0d00 383 802-1w
path 2 from e25, 2 hops:
hop input output IP and/or MAC address microsec comment
1 e27 e26 10.1.1.3 0000.0052.ea00 657 802-1w
2 e28 10.1.1.4 0000.003f.c400 296 route-only
*** Warning! The following 3 hops form a loop in vlan 2
hop input output IP and/or MAC address microsec comment
1 e25 10.1.2.2 0000.0057.2500
2 e28 10.4.100.1 0000.003f.c400
3 e29 10.1.1.1 0000.0057.0d00