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在部分設(shè)備支持STP協(xié)議的網(wǎng)絡(luò)中實(shí)施STP( 二 )

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Menu options: --------------3Com SuperStack 3 Switch 3300---------------
agingTime - Set the bridge address aging time
display - Display bridge information
multicastFiltering - Administer multicast filtering
port - Administer bridge ports
stpForwardDelay - Set the bridge Spanning Tree forward delay
stpHelloTime - Set the bridge Spanning Tree hello timer
stpMaxAge - Set the bridge Spanning Tree maximum age
stpPriority - Set the Spanning Tree bridge Priority
stpState - Enable/Disable Spanning Tree on a bridge
vlan - Administer VLANs
Type "q" to return to the previous menu or ? for help.
-----------------------------------primary3300 (1)----------------------
Select menu option (bridge): stpsta //選擇stpState菜單
Enter new value (disable, enable)[disable]: en //enable STP協(xié)議
Select menu option (bridge): dis //display狀態(tài)
stpState: enabled agingTime: 1800
Time since topology change: 0 hrs 0 mins 6 seconds
Topology Changes: 0
Bridge Identifier: 8000 00051a612eb8
Designated Root: 8000 00051a612eb8
maxAge: 20 bridgeMaxAge: 20
helloTime: 2 bridgeHelloTime: 2
forwardDelay: 15 bridgeFwdDelay: 15
holdTime: 1 rootCost: 0
rootPort: No Port priority: 0x8000
Select menu option (bridge): stppri//選擇stpPriority菜單
Enter new hexadecimal value (0x0-0xffff) [0x8000]: 0x6000　//將優(yōu)先值設(shè)為十六進(jìn)制的6000,這將導(dǎo)致該交換機(jī)成為根交換機(jī)
Select menu option (bridge): stpfor//選擇stpForwardDelay菜單
Enter new value in seconds (4-30) [15]: 9//想改變ForwardDelay值為9，但不成功
Failed to Set value due to dependencies
//forward值是一個(gè)端口從它的spanning-tree協(xié)議的學(xué)習(xí)和聆聽狀態(tài)轉(zhuǎn)到轉(zhuǎn)發(fā)狀態(tài)所等待的秒數(shù) 。
此舉主要是考慮參照CISCO的手冊(cè)，此時(shí)網(wǎng)絡(luò)直徑為3，即任意兩終端結(jié)點(diǎn)之間的最大跳數(shù)，執(zhí)行spanning-tree vlan 1　root primary　diameter 3將導(dǎo)致以下3條語句的出現(xiàn)，這是自動(dòng)優(yōu)化的結(jié)果
spanning-tree vlan 1 priority 24576
spanning-tree vlan 1 forward-time 9
spanning-tree vlan 1 max-age 12
Select menu option (bridge): stpmax//選擇stpMaxAge菜單
Enter new value (6-40) [20]: 12
//maximum-aging time值是交換機(jī)在拓?fù)渥兓瘯r(shí)在接收spanning-tree配置信息之前所等待的秒數(shù) 。
Select menu option (bridge): dis　//display狀態(tài)
stpState: enabled agingTime: 1800
Time since topology change: 0 hrs 4 mins 8 seconds
Topology Changes: 0
Bridge Identifier: 6000 00051a612eb8
Designated Root: 6000 00051a612eb8
maxAge: 12 bridgeMaxAge: 12
helloTime: 2 bridgeHelloTime: 2
forwardDelay: 15 bridgeFwdDelay: 15
holdTime: 1 rootCost: 0
rootPort: No Port priority: 0x6000
-----------------------------------primary3300 (1)----------------------
Select menu option (bridge): stpmax//為了穩(wěn)妥起見，maxujum-aging time還是用缺省的20
Enter new value (6-40) [12]: 20
Select menu option (bridge): dis　//再display狀態(tài)
stpState: enabled agingTime: 1800
Time since topology change: 0 hrs 6 mins 2 seconds
Topology Changes: 0
Bridge Identifier: 6000 00051a612eb8
Designated Root: 6000 00051a612eb8
maxAge: 20 bridgeMaxAge: 20
helloTime: 2 bridgeHelloTime: 2
forwardDelay: 15 bridgeFwdDelay: 15
holdTime: 1 rootCost: 0
rootPort: No Port priority: 0x6000
-------------------------------------------------------------------------
elect menu option (bridge): dis //將備份主交換機(jī)也按照上述步驟設(shè)置STP優(yōu)先級(jí)為ox7000
stpState: enabled agingTime: 1800
Time since topology change: 0 hrs 0 mins 42 seconds
Topology Changes: 0
Bridge Identifier: 7000 00051a5e92f8
Designated Root: 7000 00051a5e92f8
maxAge: 20 bridgeMaxAge: 20

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