Configuring Spanning Tree Protocol (STP) and IronSpan Features
December 2005 © Foundry Networks, Inc. 7 - 9
The show span command shows the following information.
Table 7.5: CLI Display of STP Information
This Field... Displays...
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.
Priority Hex This device or VLAN’s STP priority. The value is shown in
hexadecimal format.
Note: If you configure this value, specify it in decimal format. See
“Changing STP Bridge Parameters” on page 7-5.
Max age sec The number of seconds this device or VLAN waits for a configuration
BPDU from the root bridge before deciding the root has become
unavailable and performing a reconvergence.
Hello sec The interval between each configuration BPDU sent by the root
bridge.
Hold sec The minimum number of seconds that must elapse between
transmissions of consecutive Configuration BPDUs on a port.
Fwd dly sec The number of seconds this device or VLAN waits following a topology
change and consequent reconvergence.
Last Chang sec The number of seconds since the last time a topology change
occurred.
Chg cnt The number of times the topology has changed since this device was
reloaded.
Bridge Address The STP address of this device or VLAN.
Note: If this address is the same as the Root ID, then this device or
VLAN is the root bridge for its spanning tree.
Port STP Parameters
Port Num The port number.
Priority Hex The port’s STP priority, in hexadecimal format.
Note: If you configure this value, specify it in decimal format. See
“Changing STP Port Parameters” on page 7-6.
Path Cost The port’s STP path cost.
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