Changing Stp Bridge Parameters - Dell PowerConnect B-RX Configuration Manual

TABLE 72
Parameter
Hello Time
Priority
NOTE
If you plan to change STP bridge timers, Brocade recommends that you stay within the following
ranges, from section 8.10.2 of the IEEE specification.
– 2 * (forward_delay -1) >= max_age
– max_age >= 2 * (hello_time +1 )
Table 73
separately configurable on each port.
TABLE 73
Parameter
Priority
Path Cost

Changing STP bridge parameters

To change a BigIron RX's STP bridge priority to the highest value, so as to make the device the root
bridge, enter the following command.
BigIron RX(config)# vlan 20
BigIron RX(config-vlan-20)# spanning-tree priority 0
To make this change in the default VLAN, enter the following commands.
BigIron RX(config)# vlan 1
BigIron RX(config-vlan-1)# spanning-tree priority 0
Syntax: [no] spanning-tree [forward-delay <value>] | [hello-time <value>] | [max-age <value>] |
You can specify some or all of the parameters on the same command line. For information on
parameters, possible values and defaults, refer to
BigIron RX Series Configuration Guide
53-1001986-01
Default STP bridge parameters (Continued)
Description
The interval of time between each configuration BPDU
sent by the root bridge.
A parameter used to identify the root bridge in a spanning
tree (instance of STP). The bridge with the lowest value
has the highest priority and is the root.
A higher numerical value means a lower priority; thus, the
highest priority is 0.
lists the default STP port parameters. The port parameters affect individual ports and are
Default STP port parameters
Description
The preference that STP gives this port relative to other
ports for forwarding traffic out of the spanning tree.
A higher numerical value means a lower priority; thus, the
highest priority is 8.
The cost of using the port to reach the root bridge. When
selecting among multiple links to the root bridge, STP
chooses the link with the lowest path cost and blocks the
other paths. Each port type has its own default STP path
cost.
[priority <value>]
IEEE 802.1D Spanning Tree Protocol (STP)
Table 72 on page 326.
12
Default and valid values
2 seconds
Possible values: 1 – 10
seconds
32768
Possible values: 0 – 65535
Default and valid values
128
Possible values: 8 – 252,
configurable in increments
of 4
10 Mbps – 100
100 Mbps – 19
Gigabit – 4
10 Gigabit – 2
Possible values are 1– 65535
327