STP配置命令

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之前已经讲了STP算法,这一篇讲命令

1、查看STP

SW1#sh spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 4097

Address 0090.21BD.4AE6

This bridge is the root //RB才会有这句话

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec


Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)

Address 0090.21BD.4AE6

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 20


Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1 Desg FWD 19 128.1 P2p

Fa0/2 Desg FWD 19 128.2 P2p


2、修改SW优先级

SW1(config)#spanning-tree vlan 1 priority 12345

% Bridge Priority must be in increments of 4096.

% Allowed values are:

0 4096 8192 12288 16384 20480 24576 28672

32768 36864 40960 45056 49152 53248 57344 61440

SW1(config)#spanning-tree vlan 1 priority 4096

如果优先级写错了,他会提示你必须是4096的倍数。


3、修改端口优先级


这张图上一篇博客已经讲过了,那如果我想让Switch4的F0/1口通,阻塞F0/2口,那我应该调整的就是Switch3的端口ID,不懂的可以看一下前一篇

Switch(config-if)#spanning-tree vlan 1 port-priority 64

补充提示:

Switch(config-if)#spanning-tree vlan 1 port-priority ?

<0-240> port priority in increments of 16

注意是16的倍数



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