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PowerConnect B-Series FCX Configuration Guide 211
53-1002266-01
Configuring standard STP parameters
8
Changing STP bridge parameters
NOTE
If you plan to change STP bridge timers, Dell recommends that you stay within the following ranges,
from section 8.10.2 of the IEEE STP specification.
2 * (forward_delay -1) >= max_age
max_age >= 2 * (hello_time +1)
To change a STP bridge priority on a Dell PowerConnect device to the highest value to make the
device the root bridge, enter the following command.
PowerConnect(config)#spanning-tree priority 0
The command in this example changes the priority on a device on which you have not configured
port-based VLANs. The change applies to the default VLAN. If you have configured a port-based
VLAN on the device, you can configure the parameters only at the configuration level for individual
VLANs. Enter commands such as the following.
PowerConnect(config)#vlan 20
PowerConnect(config-vlan-20)#spanning-tree priority 0
To make this change in the default VLAN, enter the following commands.
PowerConnect(config)#vlan 1
PowerConnect(config-vlan-1)#spanning-tree priority 0
Syntax: [no] spanning-tree [forward-delay <value>] | [hello-time <value>] | [maximum-age
<value>] | [priority <value>]
The forward-delay <value> parameter specifies the forward delay and can be a value from 4 – 30
seconds. The default is 15 seconds.
NOTE
You can configure a Dell PowerConnect device for faster convergence (including a shorter forward
delay) using Fast Span or Fast Uplink Span. Refer to “Configuring STP related features” on
page 223.
The hello-time <value> parameter specifies the hello time and can be a value from 1 – 10 seconds.
The default is 2 seconds.
NOTE
This parameter applies only when this device or VLAN is the root bridge for its spanning tree.
The maximum-age <value> parameter specifies the amount of time the device waits for receipt of a
configuration BPDU from the root bridge before initiating a topology change. You can specify from
6 – 40 seconds. The default is 20 seconds.
The priority <value> parameter specifies the priority and can be a value from 0 – 65535. A higher
numerical value means a lower priority. Thus, the highest priority is 0. The default is 32768.
You can specify some or all of these parameters on the same command line. If you specify more
than one parameter, you must specify them in the order shown above, from left to right.