Default Pvst+ Configuration; Configuring Pvst+ Bridge Id Priority - Cisco WS-C4003 - Catalyst 4000 Chassis Switch Software Configuration Manual

Using PVST+
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Default PVST+ Configuration

Table 7-1
Table 7-3
Feature
VLAN 1
Enable state
MAC address reduction
Bridge priority
Bridge ID priority
Port priority
Port cost
Default spantree port cost
mode
Port VLAN priority
Port VLAN cost
Maximum aging time
Hello time
Forward delay time

Configuring PVST+ Bridge ID Priority

The bridge ID priority is the priority of a VLAN when the switch is in PVST+ mode.
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Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
7-14
Configuring PVST+ Port VLAN Priority, page 7-17
Disabling the PVST+ Mode on a VLAN, page 7-18
shows the default PVST+ configuration.
PVST+ Default Configuration
When the switch is in PVST+ mode without MAC address reduction enabled, you can enter a bridge
priority value between 0 and 65535. The VLAN bridge ID priority becomes that value.
When the switch is in PVST+ mode with MAC address reduction enabled, you can enter one of
16 bridge priority values: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, or 61440.
The bridge priority is combined with the system ID extension (that is, the ID of the VLAN) to create
the bridge ID priority for the VLAN.
Default Value
All ports assigned to VLAN 1
PVST+ enabled for all VLANs
Disabled
32768
32769 (bridge priority plus system ID extension of VLAN 1)
32
• Gigabit Ethernet: 4
• Fast Ethernet: 10
FDDI/CDDI: 10
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Ethernet: 100
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Short (802.1D)
Same as port priority but configurable on a per-VLAN basis in PVST+
Same as port cost but configurable on a per-VLAN basis in PVST+
20 seconds
2 seconds
15 seconds
Chapter 7 Configuring Spanning Tree
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