Cisco WS-C4003 Software Guide - Page 110

Using PVST+ Chapter 7 Configuring Spanning Tree • Configuring PVST+ Port VLAN Priority, page 7-17 • Disabling the PVST+ Mode on a VLAN, page 7-18 Default PVST+ Configuration Table 7-1 shows the default PVST+ configuration. Table 7-3 PVST+ Default Configuration 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 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 • Ethernet: 100 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 Configuring PVST+ Bridge ID Priority The bridge ID priority is the priority of a VLAN when the switch is in PVST+ mode. • 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. 7-14 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 78-12647-02