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CCNA重点难点:思科交换机生成树配置

作者:互联网

后台收到粉丝留言说讲一下生成树的配置,小微作为一个宠粉专业户,这还不快分分钟安排上,所以小伙伴们有想学想看的知识点都可以留言给小微,小微加更都会安排上~

附上:教学视频+技术文档哦,你就说棒不棒,哈

微思视频教学:超详细的【思科交换机生成树配置】https://www.zhihu.com/zvideo/1454466959215218688icon-default.png?t=LA92https://www.zhihu.com/zvideo/1454466959215218688

1. 理解生成树的运行原理

2. 掌握生成树的配置方法

1. 根据实验拓扑图,完成设备的基本配置;

2. 把交换机互连的链路配置成Trunk,采用Dot1q封装;

3. 分别在SW1、SW2和SW3上创建VLAN10和VLAN20,并将相应的接口划到对应的VLAN;

4. SW1要作为VLAN10的根,VLAN20的备份根,使PC1访问Server1的路径通过:PC1->SW3->SW1->Server1;

5. SW2要作为VLAN20的根,VLAN10的备份根,使PC2访问Server2的路径通过:PC2->SW3->SW2->Server2;

步骤1:设备的基本配置

配置PC1:

VPCS> set pcname PC1   //设置主机名
PC1> ip 192.168.1.1/24      //设置IP地址

配置PC2


VPCS> set pcname PC2
PC2> ip 172.16.1.1/24
配置Server1
VPCS> set pcname Server1
Server1> ip 192.168.1.88/24
配置Server2

VPCS> set pcname Server2
Server2> ip 172.16.1.88/24

配置SW1


Switch>enable
Switch#configure terminal
Switch(config)#hostname SW1
SW1(config)#no ip domain-lookup
SW1(config)#line console 0
SW1(config-line)#exec-timeout 0 0
SW1(config-line)#logging synchronous
SW1(config-line)#end
SW1#

 配置SW2


Switch>enable
Switch#configure terminal
Switch(config)#hostname SW2
SW2(config)#no ip domain-lookup
SW2(config)#line console 0
SW2(config-line)#exec-timeout 0 0
SW2(config-line)#logging synchronous
SW2(config-line)#end
SW2#

配置SW3


Switch>enable
Switch#configure terminal
Switch(config)#hostname SW3
SW3(config)#no ip domain-lookup
SW3(config)#line console 0
SW3(config-line)#exec-timeout 0 0
SW3(config-line)#logging synchronous
SW3(config-line)#end
SW3#

 步骤2:配置Trunk与VLAN


配置SW1:
SW1(config)#interface range Eth0/0 - 1
SW1(config-if-range)#switchport trunk encapsulation dot1q
SW1(config-if-range)#switchport mode trunk
SW1(config-if-range)#exit
SW1(config)#vlan 10
SW1(config-vlan)#name IT
SW1(config-vlan)#exit
SW1(config)#vlan 20
SW1(config-vlan)#name HR
SW1(config-vlan)#exit
SW1(config)#interface Eth0/2
SW1(config-if)#switchport mode access
SW1(config-if)#switchport access vlan 10
SW1(config-if)#exit
SW1(config)#end
SW1#

配置SW2:


SW2(config)#interface range Eth0/1 , Eth0/3
SW2(config-if-range)#switchport trunk encapsulation dot1q
SW2(config-if-range)#switchport mode trunk
SW2(config-if-range)#exit
SW2(config)#vlan 10
SW2(config-vlan)#name IT
SW2(config-vlan)#exit
SW2(config)#vlan 20
SW2(config-vlan)#name HR
SW2(config-vlan)#exit
SW2(config)#interface Eth0/2
SW2(config-if)#switchport mode access
SW2(config-if)#switchport access vlan 20
SW2(config-if)#exit
SW2(config)#end
SW2#

 配置SW3:


SW3(config)#interface range Eth0/0 , Eth0/3
SW3(config-if-range)#switchport trunk encapsulation dot1q
SW3(config-if-range)#switchport mode trunk
SW3(config-if-range)#exit
SW3(config)#vlan 10
SW3(config-vlan)#name IT
SW3(config-vlan)#exit
SW3(config)#vlan 20
SW3(config-vlan)#name HR
SW3(config-vlan)#exit
SW3(config)#interface Eth0/1
SW3(config-if)#switchport mode access
SW3(config-if)#switchport access vlan 10
SW3(config-if)#exit
SW3(config)#interface Eth0/2
SW3(config-if)#switchport mode access
SW3(config-if)#switchport access vlan 20
SW2(config-if)#exit
SW3(config)#end
SW3#

步骤3:配置生成树


配置SW1:
SW1(config)#spanning-tree vlan 10 root primary
SW1(config)#spanning-tree vlan 20 root secondary


配置SW2:
SW2(config)#spanning-tree vlan 20 root primary
SW2(config)#spanning-tree vlan 10 root secondary

步骤1:检查VLAN10的生成树

检查SW1


SW1#show spanning-tree vlan 10
VLAN0010
  Spanning tree enabled protocol ieee
  Root ID    Priority    24586
             Address     aabb.cc00.1000
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec


  Bridge ID  Priority    24586  (priority 24576 sys-id-ext 10)
             Address     aabb.cc00.1000
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  15  sec


Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/0               Desg FWD 100       128.1    P2p
Et0/1               Desg FWD 100       128.2    P2p
Et0/2               Desg FWD 100       128.3    P2p

SW1是VLAN10的根网桥,因为SW2是VLAN10的备份根网桥,所以SW3的E0/3针对VLAN10肯定是阻塞状态。

检查SW3


SW3#show spanning-tree vlan 10
VLAN0010
  Spanning tree enabled protocol ieee
  Root ID    Priority    24586
             Address     aabb.cc00.1000
             Cost        100
             Port        1 (Ethernet0/0)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec


  Bridge ID  Priority    32778  (priority 32768 sys-id-ext 10)
             Address     aabb.cc00.3000
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec


Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/0               Root FWD 100       128.1    P2p
Et0/1               Desg FWD 100       128.2    P2p
Et0/3               Altn BLK 100       128.4    P2p
针对VLAN10,SW3的E0/3是阻塞的,E0/0是转发的,这样PC1访问Server1的路径就是:PC1->SW3->SW1->Server1。


步骤2:检查VLAN20的生成树
检查SW2:
SW2#show spanning-tree vlan 20
VLAN0020
  Spanning tree enabled protocol ieee
  Root ID    Priority    24596
             Address     aabb.cc00.2000
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec


  Bridge ID  Priority    24596  (priority 24576 sys-id-ext 20)
             Address     aabb.cc00.2000
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec


Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/1               Desg FWD 100       128.2    P2p
Et0/2               Desg FWD 100       128.3    P2p
Et0/3               Desg FWD 100       128.4    P2p
SW2是VLAN20的根网桥,因为SW1是VLAN10的备份根网桥,所以SW3的E0/0针对VLAN20肯定是阻塞状态。


检查SW3:
SW3#show spanning-tree vlan 20
VLAN0020
  Spanning tree enabled protocol ieee
  Root ID    Priority    24596
             Address     aabb.cc00.2000
             Cost        100
             Port        4 (Ethernet0/3)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec


  Bridge ID  Priority    32788  (priority 32768 sys-id-ext 20)
             Address     aabb.cc00.3000
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec


Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/0               Altn BLK 100       128.1    P2p
Et0/2               Desg FWD 100       128.3    P2p
Et0/3               Root FWD 100       128.4    P2p
针对VLAN20,SW3的E0/0是阻塞的,E0/3是转发的,这样PC2访问Server2的路径就是:PC2->SW3->SW2->Server2。

标签:vlan,重点难点,交换机,sec,CCNA,SW1,SW3,SW2,config
来源: https://blog.csdn.net/XMWS_IT/article/details/121989487