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Using MISTP-PVST+ or MISTP
When all switches in the network are configured in MISTP-PVST+, you can then enable MISTP on all
of the switches.
These sections describe how to configure PVST+ on Ethernet VLANs:
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Default MISTP Configuration
Table 7-2
Table 7-4
Feature
Enable state
MAC address reduction
Bridge priority
Bridge ID priority
Port priority
Port cost
Default port cost mode
Port VLAN priority
Port VLAN cost
Maximum aging time
Hello time
Forward delay time
Enabling MISTP-PVST+ or MISTP
If you enable MISTP in a PVST+ network, you must be very 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 4500 VLAN ports configured on your switch, your network could crash if you
change from MISTP to either PVST+ or MISTP-PVST+ mode. Reduce the number of configured VLAN
ports on your switch to no more than 4,500 to avoid losing connectivity.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
7-20
Default MISTP Configuration, page 7-19
Enabling MISTP-PVST+ or MISTP, page 7-19
Enabling a MISTP Instance, page 7-24
Mapping VLANs to a MISTP Instance, page 7-25
Disabling MISTP-PVST+ or MISTP, page 7-26
shows the default configuration for MISTP and MISTP-PVST+.
MISTP Default Configuration
Default Value
Disabled until a VLAN is mapped to a MISTP instance
Disabled
32768
32769 (bridge priority plus the system ID extension of MISTP instance 1)
32 (global)
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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
Gigabit Ethernet: 4
Fast Ethernet: 10
FDDI/CDDI: 10
Ethernet: 100
Chapter 7
Configuring Spanning Tree
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