7-26
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 7 Configuring Spanning Tree
Configuring PVST+ on the Switch
Configuring PVST+ on the Switch
These sections describe how to configure PVST+ on Ethernet VLANs:
• Default PVST+ Configuration, page 7-26
• Setting the PVST+ Bridge ID Priority, page 7-27
• Configuring the PVST+ Port Cost, page 7-28
• Configuring the PVST+ Port Priority, page 7-29
• Configuring the PVST+ Default Port Cost Mode, page 7-29
• Configuring the PVST+ Port Cost for a VLAN, page 7-31
• Configuring the PVST+ Port Priority for a VLAN, page 7-31
• Disabling the PVST+ Mode on a VLAN, page 7-32
Default PVST+ Configuration
Table 7-4 shows the default PVST+ configuration.
Table 7-4 PVST+ Default Configuration
Feature Default Value
VLAN 1 All ports assigned to VLAN 1
Enable state PVST+ enabled for all VLANs
MAC address reduction Disabled
Bridge priority 32768
Bridge ID priority 32769 (bridge priority plus system ID extension of VLAN 1)
Port priority 32
Port cost
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
1
• FDDI/CDDI: 10
• Ethernet: 100
2
1. If 10/100 Mbps ports autonegotiate or are hard set to 100 Mbps, the port cost is 19.
2. If 10/100 Mbps ports autonegotiate or are hard set to 10 Mbps, the port cost is 100.
Default spantree port cost
mode
Short (802.1D)
Port VLAN priority Same as port priority but configurable on a per-VLAN basis in PVST+
Port VLAN cost Same as port cost but configurable on a per-VLAN basis in PVST+
Maximum aging time 20 seconds
Hello time 2 seconds
Forward delay time 15 seconds
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