Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario descargar pdf (Pagina 351)

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Multi-Service IronWare Switching Configuration Guide 321

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IEEE 802.1D Spanning Tree Protocol (STP)

NOTE

If you plan to change STP bridge timers, it is recommended 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 51 lists the default STP port parameters. The port parameters affect individual ports and are

separately configurable on each port.

Changing STP bridge parameters

To change a Brocade device’s STP bridge priority to the highest value, so as to make the Brocade

device the root bridge, enter the following command.

Brocade(config)# vlan 20

Brocade(config-vlan-20)# spanning-tree priority 0

To make this change in the default VLAN, enter the following commands.

Brocade(config)# vlan 1

Brocade(config-vlan-1)# spanning-tree priority 0

Syntax: [no] spanning-tree [forward-delay value] | [hello-time value] | [max-age value] | [priority

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 Table 50.

Hello Time The interval of time between each configuration BPDU sent

by the root bridge.

2 seconds

Possible values: 1 – 10 seconds

Priority 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.

32768

Possible values: 0 – 65535

TABLE 51 Default STP port parameters

Parameter Description Default and valid values

Priority 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.

128

Possible values: 8 – 252,

configurable in increments of 4

Path Cost 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.

10 Mbps – 100

100 Mbps – 19

1 Gigabit – 4

10 Gigabit – 2

40 Gigabit – 1

100 Gigabit – 1

Possible values are 1– 65535

TABLE 50 Default STP bridge parameters (Continued)

Parameter Description Default and valid values

1 2 ... 346 347 348 349 350 351 352 353 354 355 356 ... 983 984

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