FTOS Configuration Guide for the C-Series - Force10 Networks

Step Command Syntax Command Mode Purpose
2
no disable CONFIGURATION
(conf-pvst)
You must first enter PVST+ configuration mode before enabling (or disabling) PVST+ .
Force10#conf
Force10(conf)#protocol spanning-tree pvst
Force10(conf-pvst)#no disable
Figure 277 Enabling PVST+
When PVST+ is enabled, the Force10 device runs an STP instance for each VLAN it supports.
Configuring bridge priority
In STP, the algorithm determines the root bridge, but you can assign one bridge a lower priority to increase
the likelihood that it will be selected as the STP root bridge. During the STP initialization process, the
bridge with the lowest number identifier is elected to be the root; however, you can influence the root
selection by designating a bridge as a primary or backup root.
To change the bridge priority, use the following command in the PVST+ CONFIGURATION mode:
Command Syntax Command Mode Purpose
vlan vlan-range bridge-priority
value
CONFIGURATION
(conf-pvst)
To configure bridge priority, use the command as shown in the example below:
Force10(conf)# protocol spanning-tree pvst
Force10(conf-pvst)# no disable
Context: protocol spanning-tree pvst
Force10(conf-pvst)# vlan 1 bridge-priority 4096
Figure 278 PVST+ Configuration Examples
Enable PVST+. Once PVST+ is enabled, the
device runs an STP instance for each VLAN it
supports.
Enter the keyword bridge-priority followed by
the bridge priority value in increments of 4096.
Range: 0 to 61440
Default: 32768
FTOS Configuration Guide, version 7.7.1.0 399