14-11
Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
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Chapter14 Configuring STP Configuring Spanning-Tree Features
Configuring Spanning-Tree Features
These sections contain this configuration information:
•Default Spanning-Tree Configuration, page 14-11
•Spanning-Tree Configuration Guidelines, page 14-12
•Changing the Spanning-Tree Mode., page 14-13 (required)
•Disabling Spanning Tree, page 14-14 (optional)
•Configuring the Root Switch, page 14-14 (optional)
•Configuring a Secondary Root Switch, page 14-16 (optional)
•Configuring Port Priority, page 14-16 (optional)
•Configuring Path Cost, page 14-18 (optional)
•Configuring the Switch Priority of a VLAN, page 14-19 (optional)
•Configuring Spanning-Tree Timers, page 14-20 (optional)

Default Spanning-Tree Configuration

Table14-3 shows the de fault sp an ning- t ree configur ation .
Table14-3 Default Spanning-Tree Configuration
Feature Default Setting
Enable state Enabled on NNIs in VLAN 1.
For more information, see the “Supported
Spanning-Tree Instances” section on
page 14-10.
Spanning-tree mode Rapid PVST+
Rapid PVST+ interoperates with PVST and
PVST+. MSTP is disabled.
Switch priority 32768.
Spanning-tree port priority (configurable on a per-interface basis) 128.
Spanning-tree port cost (configurable on a per-interface basis) 1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
Spanning-tree VLAN port priority (configurable on a per-VLAN basis) 128.
Spanning-tree VLAN port cost (configurable on a per-VLAN basis) 1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
Spanning-tree timers Hello time: 2 seconds.
Forward-delay time: 15 seconds.
Maximum-aging time: 20 seconds.