Table of Contents
Advertisement
Chapter 8
Configuring Spanning Tree
Default MISTP and MISTP-PVST+ Configuration
Table 8-4
Table 8-4
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
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.
Setting MISTP-PVST+ Mode or 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.
If you have more than 6000 VLAN ports configured on your switch, changing from MISTP to either
Caution
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.
If you are working from a Telnet connection to your switch, the first time you enable MISTP-PVST+
Caution
or MISTP mode, you must do so from the switch console; do not use a Telnet connection through the
data port or you will lose your connection to the switch. After you map a VLAN to an MISTP
instance, you can Telnet to the switch.
78-13315-02
shows the default MISTP and MISTP-PVST+ configuration.
MISTP and MISTP-PVST+ Default Configuration
Default Value
Disabled until a VLAN is mapped to an MISTP instance
Disabled
32768
32769 (bridge priority plus the system ID extension of MISTP instance 1)
32 (global)
Gigabit Ethernet: 4
•
Fast Ethernet: 19
•
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
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
1
2
Using MISTP-PVST+ or MISTP
8-23
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
