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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 7 Configuring Spanning Tree
Configuring MISTP-PVST+ or MISTP on the Switch
• Mapping VLANs to an MISTP Instance, page 7-41
• Disabling MISTP-PVST+ or MISTP, page 7-44
Default MISTP and MISTP-PVST+ Configuration
Table 7-5 shows the default MISTP and MISTP-PVST+ configuration.
Setting the MISTP-PVST+ Mode or the MISTP Mode
If you enable MISTP in a PVST+ network, you must be careful to avoid bringing down the network. This
section explains how to enable MISTP or MISTP-PVST+ on your network.
Caution If you have more than 6000 VLAN ports that are configured on your switch, changing from MISTP to
either PVST+ or MISTP-PVST+ mode could bring down your network. Reduce the number of
configured VLAN ports on your switch to no more than 6000 to avoid losing connectivity.
Table 7-5 MISTP and MISTP-PVST+ Default Configuration
Feature Default Value
Enable state Disabled until a VLAN is mapped to an MISTP instance
MAC address reduction Disabled
Bridge priority 32768
Bridge ID priority 32769 (bridge priority plus the system ID extension of MISTP instance 1)
Port priority 32 (global)
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 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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