生成树协议STP PVST

网络互连要求：

规划和设计各路由接口的IP地址,并使用动态路由协议OSPF,进程号每人使用自己的序号
按照网络拓扑图，配置好三层交换机，创建VLAN，给VLAN配置适当的IP地址，把接口加入相应的VLAN,启用动态路由协议OSPF，使所有VLAN之间的主机能正确路由
配置所有计算机和服务器的IP地址
在所有交换机上启用PVST生成树模式，并查看此时哪个交换机是树根，有连接线的端口分别是什么模式端口
给交换机设置优先级，S2为4096，S1为8192，其余的为默认值；查看此时哪个交换机为根交换机，所有交换机有连接线的端口分别是什么模式端口
把交换机S2关电，查看此时哪个交换机为根交换机，三个计算机分别走哪些交换机线路到达FTP服务器的
把交换机S2关电，在交换机S3和S4之间的F0/24相连接；把S3和S2之间的线路带宽设置为10Mbps,看看此时PC1走哪些交换机线路到达FTP服务器的
把交换机S2恢复供电，在S1的VLAN 2上设置优先级为4096, 在S2的 VLAN 2上设置优先级为8192; 在S1的VLAN 3上设置优先级为8192, 在S2的 VLAN 3上设置优先级为4096;查看此时VLAN 2和VLAN 3的根交换机分别是哪一台

配置代码：

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
!就是启用基于VLAN的生成树模式，这是思科的独有用法，简单说就是一个VLAN
!一棵树，在一个网络里，不同的VLAN可以有不同的根桥，不同的阻塞端口等等，其主要目
!的是为了提高链路利用率（可以想象，如果所有VLAN都是同一棵树，必定有一部分线路
!处于完全的block状态）
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