生成樹協議STP PVST

網絡互連要求：

規劃和設計各路由接口的IP地址,並使用動態路由協議OSPF,進程號每人使用自己的序號
按照網絡拓撲圖，配置好三層交換機，創建VLAN，給VLAN配置適當的IP地址，把接口加入相應的VLAN,啓用動態路由協議OSPF，使所有VLAN之間的主機能正確路由
配置所有計算機和服務器的IP地址
在所有交換機上啓用PVST生成樹模式，並查看此時哪個交換機是樹根，有連接線的端口分別是什麼模式端口
給交換機設置優先級，S2爲4096，S1爲8192，其餘的爲默認值；查看此時哪個交換機爲根交換機，所有交換機有連接線的端口分別是什麼模式端口
把交換機S2關電，查看此時哪個交換機爲根交換機，三個計算機分別走哪些交換機線路到達FTP服務器的
把交換機S2關電，在交換機S3和S4之間的F0/24相連接；把S3和S2之間的線路帶寬設置爲10Mbps,看看此時PC1走哪些交換機線路到達FTP服務器的
把交換機S2恢復供電，在S1的VLAN 2上設置優先級爲4096, 在S2的 VLAN 2上設置優先級爲8192; 在S1的VLAN 3上設置優先級爲8192, 在S2的 VLAN 3上設置優先級爲4096;查看此時VLAN 2和VLAN 3的根交換機分別是哪一臺

配置代碼：

S1：
en
conf t
host s1
no ip domain-lookup
vlan 2
exit	
vlan 3
exit
vlan 4
Exit
vlan 5
Exit
Vlan 6
exit
int vlan 2
ip address 192.168.2.254 255.255.255.0
int vlan 3
ip address 192.168.3.254 255.255.255.0
int vlan 4
ip address 192.168.4.254 255.255.255.0
int vlan 5
ip address 192.168.5.254 255.255.255.0
int vlan 6
ip address 192.168.6.254 255.255.255.0
int f0/1
switchport access vlan 2
int f0/2
switchport access vlan 3
int f0/3
switchport access vlan 4
int f0/4
switchport mode access
switchport mode trunk
int f0/5
switchport access vlan 6
int f0/6
switchport access vlan 5
ip routing
Router ospf 22
Network 192.168.2.0 0.0.0.255 area 0
Network 192.168.3.0 0.0.0.255 area 0
Network 192.168.4.0 0.0.0.255 area 0
Network 192.168.5.0 0.0.0.255 area 0
Network 192.168.6.0 0.0.0.255 area 0
spanning-tree mode pvst
!就是啓用基於VLAN的生成樹模式，這是思科的獨有用法，簡單說就是一個VLAN
!一棵樹，在一個網絡裏，不同的VLAN可以有不同的根橋，不同的阻塞端口等等，其主要目
!的是爲了提高鏈路利用率（可以想象，如果所有VLAN都是同一棵樹，必定有一部分線路
!處於完全的block狀態）
exit
show spanning-tree

S2：
en
conf t
host s2
no ip domain-lookup
vlan 2
exit
vlan 3
exit
vlan 4
Exit
vlan 5
Exit
Vlan 6
exit
int vlan 2
ip address 192.168.2.253 255.255.255.0
int vlan 3
ip address 192.168.3.253 255.255.255.0
int vlan 4
ip address 192.168.4.253 255.255.255.0
int vlan 5
ip address 192.168.5.253 255.255.255.0
int vlan 6
ip address 192.168.6.253 255.255.255.0
int f0/1
switchport access vlan 2
int f0/2
switchport access vlan 3
int f0/3
switchport access vlan 4
int f0/4
switchport mode access
switchport mode trunk
int f0/5
switchport access vlan 6
ip routing
Router ospf 22
Network 192.168.2.0 0.0.0.255 area 0
Network 192.168.3.0 0.0.0.255 area 0
Network 192.168.4.0 0.0.0.255 area 0
Network 192.168.6.0 0.0.0.255 area 0
spanning-tree mode pvst
exit
show spanning-tree

S3:
En
Conf t
Host s3
Int range f0/1-3
Switchport access vlan 2
exit
spanning-tree mode pvst
exit
show spanning-tree

S4:
En
Conf t
Host s4
Int range f0/1-3
Switchport access vlan 3
exit
spanning-tree mode pvst
exit
show spanning-tree

S5:
En
Conf t
Host s5
Int range f0/1-3
Switchport access vlan 4
exit
spanning-tree mode pvst
exit
show spanning-tree

S6:
En
Conf t
Host s6
spanning-tree mode pvst
exit
show spanning-tree

R1:
En
Conf t
Host r1
No ip domain-lookup
Int g0/0
Ip address 192.168.6.1 255.255.255.0
No shut
Int g0/1
Ip address 202.120.80.2 255.255.255.0
No shut
Int loopback 0
Ip address 1.1.1.1 255.255.255.255
No shut
Exit
Router ospf 22
Network 192.168.6.0 0.0.0.255 area 0
Network 202.120.80.0 0.0.0.255 area 0

R2:
En
Conf t
Host r2
No ip domain-lookup
Int g0/0
Ip address 192.168.6.2 255.255.255.0
No shut
Int g0/1
Ip address 202.120.80.3 255.255.255.0
No shut
Int loopback 0
Ip address 2.2.2.2 255.255.255.255
No shut
Exit
Router ospf 22
Network 192.168.6.0 0.0.0.255 area 0
Network 202.120.80.0 0.0.0.255 area 0