修改桥优先级Modifybridgepriority.doc

修改桥优先级(Modify bridge priority)
Experiment process:
The
first step is to configure the SW1 port
SW1
(config) #int f20000 128. 91
fastethernet2 / 11 128 19 fwd 0 32768 ccf8. 0750. 0000 128. 92
interface designated
name port id were cost sts cost bridge id port id fastethernet2 / 14 128 19 fwd 0 32768 ccf8. 0750. 0000 128. 95
fastethernet2 / 15 128 19 fwd 0 32768 ccf8. 0750. 0000 128. 96
swl # swl # show spanning int f2 / 10 port 91 (fastethernet2 / 10) of vlanl ice forwarding
port path cost 19, port priority 128 port identifier .
designated root has priority 32768, address ccf8. 0750. 0000
designated bridge has priority 32768, address ccf8. 0750. 0000
designated port id ice 128. 91, designated path cost 0
hours: message age forward delay 0, 0, 0
number of transitions to forwarding state: 1
bpdu: late 914, received 48
swl #
swl # show spanning int f2 / 11
port 92 (fastethernet2 / 11) of vlanl ice forwarding
port path cost 19, port priority 128 port identifier .
designated root has priority 32768, address ccf8. 0750. 0000
designated bridge has priority 32768, address ccf8. 0750. 0000 designated port id ice , designated path cost 0
hours: message age forward delay 0, 0, 0 number of transitions to forwarding state: 1
bpdu: late 875, received 48
swl #
第四步 查看sw2的spanning - tree运行情况
sw2 # show spanning - tree
vlanl is executing the ieee tty compatible spanning tree protocol
bridge identifier has priority 32768, address ccf9. OlcO. 0000
configured hello time 2, max age 20, forward delay 15 current root has priority 32768, address ccf8. 0750. 0000 root port ice 91 (fastethernet2 / 10), cost of root path ice 19
topology change flag is not set, the detected flag not set
number of topology changes 3 load change occurred 00: 01: 15 ago
时间：持有1,拓扑变化35,通知2
你好2,最大年龄20,远期延误15
定时器：hello 0,拓扑变化0,通知0,老化300
SW2 #显示生成树简介
VLAN1
生成树协议
根ID优先级32768
地址 ccf8. 0750. 0000
成本的19
端口 91 (fastethernet2 / 10)
你好时间2秒最大年龄20