Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 259)

Displaying STP information for an entire device
To display STP information, enter the following command at any level of the CLI.
device#show span
VLAN 1 BPDU cam_index is 3 and the Master DMA Are(HEX)
STP instance owned by VLAN 1
Global STP (IEEE 802.1D) Parameters:
VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge
ID ID Cost Port rity Age llo ld dly Chang cnt Address
Hex sec sec sec sec sec
1 800000e0804d4a00 0 Root 8000 20 2 1 15 689 1 00e0804d4a00
Port STP Parameters:
Port Prio Path State Fwd Design Designated Designated
Num rity Cost Trans Cost Root Bridge
Hex
1 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
2 80 0 DISABLED 0 0 0000000000000000 0000000000000000
3 80 0 DISABLED 0 0 0000000000000000 0000000000000000
4 80 0 DISABLED 0 0 0000000000000000 0000000000000000
5 80 19 FORWARDING 1 0 800000e0804d4a00 800000e0804d4a00
6 80 19 BLOCKING 0 0 800000e0804d4a00 800000e0804d4a00
7 80 0 DISABLED 0 0 0000000000000000 0000000000000000
Syntax: show span [ vlan vlan-id] | [pvst-mode] | [num] | [detail [vlan vlan-id [ethernet [port] | num]]]
The vlanvlan-id parameter displays STP information for the specified port-based VLAN.
The pvst-mode parameter displays STP information for the device Per VLAN Spanning Tree (PVST+)
compatibility configuration. Refer to
PVST/PVST+ compatibility on page 317
The num parameter displays only the entries after the number you specify. For example, on a device
with three port-based VLANs, if you enter 1, then information for the second and third VLANs is
displayed, but information for the first VLAN is not displayed. Information is displayed according to
VLAN number, in ascending order. The entry number is not the same as the VLAN number. For
example, if you have port-based VLANs 1, 10, and 2024, then the command output has three STP
entries. To display information for VLANs 10 and 2024 only, enter show span 1 .
The detail parameter and its additional optional parameters display detailed information for individual
ports. Refer to
Displaying detailed STP information for each interface on page 261.
The show span command shows the following information.
CLI display of STP information TABLE 46
Field Description
Global STP parameters
VLAN ID The port-based VLAN that contains this spanning tree (instance of STP). VLAN 1 is the default
VLAN. If you have not configured port-based VLANs on this device, all STP information is for
VLAN 1.
Root ID The ID assigned by STP to the root bridge for this spanning tree.
Root Cost The cumulative cost from this bridge to the root bridge. If this device is the root bridge, then the
root cost is 0.
Root Port The port on this device that connects to the root bridge. If this device is the root bridge, then
the value is "Root" instead of a port number.
Displaying STP information for an entire device
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 259
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