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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 10 Configuring STP
Configuring Basic STP Features
Configuring Basic STP Features
These sections include basic STP configuration information:
•
Default STP Configuration, page 10-21
•
Disabling STP, page 10-22
•
Configuring the Root Switch, page 10-22
•
Configuring a Secondary Root Switch, page 10-24
•
Configuring STP Port Priority, page 10-26
•
Configuring STP Path Cost, page 10-27
•
Configuring the Switch Priority of a VLAN, page 10-28
•
Configuring the Hello Time, page 10-29
•
Configuring the Forwarding-Delay Time for a VLAN, page 10-29
•
Configuring the Maximum-Aging Time for a VLAN, page 10-30
•
Configuring STP for Use in a Cascaded Stack, page 10-30
•
Displaying STP Status, page 10-31
For advanced configuration information, see the
“Configuring Advanced STP Features” section on
page 10-32
.
Default STP Configuration
Table 10-3
shows the default STP configuration.
Table 10-3
Default STP Configuration
Feature
Default Setting
Enable state
Enabled on VLAN 1.
Up to 128 spanning-tree instances can be
enabled.
Switch priority
32768.
Spanning-tree port priority (configurable on a per-interface basis—used on
interfaces configured as Layer 2 access ports)
128.
Spanning-tree port cost (configurable on a per-interface basis—used on
interfaces configured as Layer 2 access ports)
1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
Spanning-tree VLAN port priority (configurable on a per-VLAN basis—used
on interfaces configured as Layer 2 trunk ports)
128.
Spanning-tree VLAN port cost (configurable on a per-VLAN basis—used on
interfaces configured as Layer 2 trunk ports)
1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
Hello time
2 seconds.
