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220 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring standard STP parameters
8
If a port is disabled, the only information shown by this command is “DISABLED”. If a port is
enabled, this display shows the following information.
Syntax: show span detail [vlan <vlan-id> [ethernet <port>| <num>]
The vlan <vlan-id> parameter specifies a VLAN.
Specify the <port> variable in the following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
The <num> parameter specifies the number of VLANs you want the CLI to skip before displaying
detailed STP information. For example, if the device has six VLANs configured (VLAN IDs 1, 2, 3,
99, 128, and 256) and you enter the command show span detail 4, detailed STP information is
displayed for VLANs 128 and 256 only.
NOTE
If the configuration includes VLAN groups, the show span detail command displays the master
VLANs of each group but not the member VLANs within the groups. However, the command does
indicate that the VLAN is a master VLAN. The show span detail vlan <vlan-id> command displays
the information for the VLAN even if it is a member VLAN. To list all the member VLANs within a VLAN
group, enter the show vlan-group [<group-id>] command.
The show span detail command shows the following information.
TABLE 51 CLI display of detailed STP information for ports
This field... Displays...
Active Spanning Tree protocol The VLAN that contains the listed ports and the active Spanning Tree protocol.
The STP type can be one of the following:
• MULTIPLE SPANNNG TREE (MSTP)
• GLOBAL SINGLE SPANNING TREE (SSTP)
NOTE: If STP is disabled on a VLAN, the command displays the following
message instead: “Spanning-tree of port-vlan <vlan-id> is disabled.”
Bridge identifier The STP identity of this device.
Active global timers The global STP timers that are currently active, and their current values. The
following timers can be listed:
• Hello – The interval between Hello packets. This timer applies only to the
root bridge.
• Topology Change (TC) – The amount of time during which the topology
change flag in Hello packets will be marked, indicating a topology
change. This timer applies only to the root bridge.
• Topology Change Notification (TCN) – The interval between Topology
Change Notification packets sent by a non-root bridge toward the root
bridge. This timer applies only to non-root bridges.