Default Spanning-Tree Configuration; Spanning-Tree Configuration Guidelines - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 17 Configuring STP
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Default Spanning-Tree Configuration

Table 17-3
Table 17-3 Default Spanning-Tree Configuration
Feature
Enable state
Spanning-tree mode
Switch priority
Spanning-tree port priority (configurable on a per-interface basis)
Spanning-tree port cost (configurable on a per-interface basis)
Spanning-tree VLAN port priority (configurable on a per-VLAN basis)
Spanning-tree VLAN port cost (configurable on a per-VLAN basis)
Spanning-tree timers

Spanning-Tree Configuration Guidelines

Each stack member runs its own spanning tree, and the entire stack appears as a single switch to the rest
of the network.
If more VLANs are defined in the VTP than there are spanning-tree instances, you can enable PVST+
or rapid PVST+ on only 128 VLANs on each switch stack. The remaining VLANs operate with spanning
tree disabled. However, you can map multiple VLANs to the same spanning-tree instances by using
MSTP. For more information, see
78-16180-02
Configuring a Secondary Root Switch, page 17-17
Configuring Port Priority, page 17-18
Configuring Path Cost, page 17-20
Configuring the Switch Priority of a VLAN, page 17-21
Configuring Spanning-Tree Timers, page 17-22
shows the default spanning-tree configuration.
(optional)
(optional)
(optional)
(optional)
Default Setting
Enabled on VLAN 1.
For more information, see the
Spanning-Tree Instances" section on
page
PVST+. (Rapid PVST+ and MSTP are
disabled.)
32768.
128.
1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
128.
1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
Hello time: 2 seconds.
Forward-delay time: 15 seconds.
Maximum-aging time: 20 seconds.
Chapter 18, "Configuring MSTP."
Catalyst 3750 Switch Software Configuration Guide
Configuring Spanning-Tree Features
(optional)
17-10.
"Supported
17-13