網絡設計與配置的要求:
- 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,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,S1爲4096,S2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S1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S1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S1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
配置下列代碼之前:
S1:
en
conf t
host s1
no ip domain-lookup
vlan 2
exit
vlan 3
exit
vlan 4
Exit
vlan 5
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 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 5
ip routing
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
Conf t
spanning-tree vlan 1-5 priority 4096
S2:
en
conf t
host s2
no ip domain-lookup
vlan 2
exit
vlan 3
exit
vlan 4
Exit
vlan 5
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 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 5
ip routing
spanning-tree mode pvst
exit
show spanning-tree
Conf t
spanning-tree vlan 1-5 priority 8192
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
Int range f0/1-3
Switchport access vlan 5
exit
spanning-tree mode pvst
exit
show spanning-tree
配置上述代碼之後:
如果端口既做了根端口,又做了指定端口,又做了阻塞端口,那對於模擬器而言,就是優先顯示綠色
S1:
S2:
S3:
S4:
S5:
S6:
完成第4步之後,即配置完成:
S1:spanning-tree vlan 1-5 priority 4096
S2:spanning-tree vlan 1-5 priority 8192之後
S1:
S6:
5:把交換機S1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
Int range f0/1-5
shutdown之後
注意這裏要修改PC機的網關爲192.168.x.253
ftp:
6:把交換機S1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;
S3修改鏈路帶寬:
Int f0/2
speed 10
S3:
Int f0/24
Switchport access vlan 2
S4:
Vlan 2
Exit
Int f0/24
Switchport access vlan 2
Int f0/2
Switchport mode trunk
之後:
ftp:
S2:
S3:
S4:
S5:
S6:
7:把交換機S1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
S1:
int range f0/1-5
no shutdown
之後
S4:
Vlan1 cost:38
vlan2 cost:38
Vlan3 cost:19
S1:
S1:
spanning-tree vlan 2 priority 4096
spanning-tree vlan 3 priority 8192
S2:
spanning-tree vlan 2 priority 8192
spanning-tree vlan 3 priority 4096
配置之後:
S1:
S2:
S3:
S4:
S5:
S6: