Trunk 实现跨交换机 VLAN 通信

交换机 VLAN 的划分

当网络中有多台交换机时,位于不同交换机上的相同VLAN的主机之间时如何通信的呢?我们使用Trunk实现跨交换机VLAN通信。还有以太网通道的操作哦。


实验拓扑

交换机 VLAN 的划分

两台交换机直连,每台下面再连接两台VPC,划分VLAN,地址规划如下:

名称 接口 VLAN 地址
PC1 SW1-f1/0 vlan 10 192.168.10.10/24
PC2 SW1-f1/1 vlan 20 192.168.10.20/24
PC3 SW2-f1/0 vlan 10 192.168.10.30/24
PC4 SW2-f1/1 vlan 20 192.168.10.40/24

配置方法

SW1(config)#interface fastEthernet 1/2  SW1(config-if)#switchport mode trunk  SW1(config-if)#switchport trunk encapsulation dot1q  SW1(config-if)#end  

配置过程

交换机划分 VLAN
  • SW1
SW1#conf t  SW1(config)#no ip routing  SW1(config)#vlan 10,20  SW1(config-vlan)#ex  SW1(config)#int f1/0  SW1(config-if)#sw m a  SW1(config-if)#sw a v 10  SW1(config-if)#ex  SW1(config)#int f1/1  SW1(config-if)#sw m a  SW1(config-if)#sw a v 20  SW1(config-if)#ex  SW1(config)#do show vlan-sw b    VLAN Name                             Status    Ports  ---- -------------------------------- --------- -------------------------------  1    default                          active    Fa1/2, Fa1/3, Fa1/4, Fa1/5                                                  Fa1/6, Fa1/7, Fa1/8, Fa1/9                                                  Fa1/10, Fa1/11, Fa1/12, Fa1/13                                                  Fa1/14, Fa1/15  10   VLAN0010                         active    Fa1/0  20   VLAN0020                         active    Fa1/1  1002 fddi-default                     act/unsup  1003 token-ring-default               act/unsup  1004 fddinet-default                  act/unsup  1005 trnet-default                    act/unsup  
  • SW2
SW2#conf t  SW2(config)#no ip routing  SW2(config)#vlan 10,20  SW2(config-vlan)#ex  SW2(config)#int f1/0  SW2(config-if)#sw m a  SW2(config-if)#sw a v 10  SW2(config-if)#ex  SW2(config)#int f1/1  SW2(config-if)#sw m a  SW2(config-if)#sw a v 20  SW2(config-if)#ex  SW2(config)#do show vlan-sw b    VLAN Name                             Status    Ports  ---- -------------------------------- --------- -------------------------------  1    default                          active    Fa1/2, Fa1/3, Fa1/4, Fa1/5                                                  Fa1/6, Fa1/7, Fa1/8, Fa1/9                                                  Fa1/10, Fa1/11, Fa1/12, Fa1/13                                                  Fa1/14, Fa1/15  10   VLAN0010                         active    Fa1/0  20   VLAN0020                         active    Fa1/1  1002 fddi-default                     act/unsup  1003 token-ring-default               act/unsup  1004 fddinet-default                  act/unsup  1005 trnet-default                    act/unsup  
配置 Trunk
  • SW1
SW1(config)#interface fastEthernet 1/2  SW1(config-if)#switchport mode trunk  SW1(config-if)#switchport trunk encapsulation dot1q  SW1(config-if)#end  
  • 查询验证
SW1#show interfaces fastEthernet 1/2 switchport  Name: Fa1/2  Switchport: Enabled  Administrative Mode: trunk  Operational Mode: trunk  Administrative Trunking Encapsulation: dot1q  Operational Trunking Encapsulation: dot1q  Negotiation of Trunking: Disabled  Access Mode VLAN: 0 ((Inactive))  Trunking Native Mode VLAN: 1 (default)  Trunking VLANs Enabled: ALL  Trunking VLANs Active: 1,10,20  Protected: false  Priority for untagged frames: 0  Override vlan tag priority: FALSE  Voice VLAN: none  Appliance trust: none  
  • SW2
SW2(config)#int f1/2  SW2(config-if)#sw m t  SW2(config-if)#sw t e d  SW2(config-if)#do show int f1/2 switchport  Name: Fa1/2  Switchport: Enabled  Administrative Mode: trunk  Operational Mode: trunk  Administrative Trunking Encapsulation: dot1q  Operational Trunking Encapsulation: dot1q  Negotiation of Trunking: Disabled  Access Mode VLAN: 0 ((Inactive))  Trunking Native Mode VLAN: 1 (default)  Trunking VLANs Enabled: ALL  Trunking VLANs Active: 1,10,20  Protected: false  Priority for untagged frames: 0  Override vlan tag priority: FALSE  Voice VLAN: none  Appliance trust: none  

PING 测试

  • PC1
PC1> ip 192.168.10.10  Checking for duplicate address...  PC1 : 192.168.10.10 255.255.255.0    PC1> ping 192.168.10.20  host (192.168.10.20) not reachable    PC1> ping 192.168.10.30  84 bytes from 192.168.10.30 icmp_seq=1 ttl=64 time=1.876 ms  84 bytes from 192.168.10.30 icmp_seq=2 ttl=64 time=1.853 ms  84 bytes from 192.168.10.30 icmp_seq=3 ttl=64 time=1.992 ms  84 bytes from 192.168.10.30 icmp_seq=4 ttl=64 time=0.000 ms  84 bytes from 192.168.10.30 icmp_seq=5 ttl=64 time=1.853 ms    PC1> ping 192.168.10.40  host (192.168.10.40) not reachable  
PC1 PING PC3 抓包
  • SW1F1/0接口开启抓包

交换机 VLAN 的划分

  • SW1F1/2接口开启抓包

交换机 VLAN 的划分

数据包在出交换机时被打上vlan 10的标签。

  • PC2
PC2> ip 192.168.10.20  Checking for duplicate address...  PC1 : 192.168.10.20 255.255.255.0    PC2> ping 192.168.10.10  host (192.168.10.10) not reachable    PC2> ping 192.168.10.30  host (192.168.10.30) not reachable    PC2> ping 192.168.10.40  84 bytes from 192.168.10.40 icmp_seq=1 ttl=64 time=1.992 ms  84 bytes from 192.168.10.40 icmp_seq=2 ttl=64 time=1.999 ms  84 bytes from 192.168.10.40 icmp_seq=3 ttl=64 time=1.870 ms  84 bytes from 192.168.10.40 icmp_seq=4 ttl=64 time=1.842 ms  84 bytes from 192.168.10.40 icmp_seq=5 ttl=64 time=1.846 ms  
PC2 PING PC4 抓包
  • SW1F1/1接口开启抓包

交换机 VLAN 的划分

  • SW1F1/2接口开启抓包

交换机 VLAN 的划分

数据包在出交换机时被打上vlan 20的标签。

  • PC3
PC3> ip 192.168.10.30  Checking for duplicate address...  PC1 : 192.168.10.30 255.255.255.0    PC3> ping 192.168.10.10  84 bytes from 192.168.10.10 icmp_seq=1 ttl=64 time=1.878 ms  84 bytes from 192.168.10.10 icmp_seq=2 ttl=64 time=1.849 ms  84 bytes from 192.168.10.10 icmp_seq=3 ttl=64 time=1.840 ms  84 bytes from 192.168.10.10 icmp_seq=4 ttl=64 time=1.842 ms  84 bytes from 192.168.10.10 icmp_seq=5 ttl=64 time=1.845 ms    PC3> ping 192.168.10.20  host (192.168.10.20) not reachable    PC3> ping 192.168.10.40  host (192.168.10.40) not reachable  
  • PC4
PC4> ip 192.168.10.40  Checking for duplicate address...  PC1 : 192.168.10.40 255.255.255.0    PC4> ping 192.168.10.10  host (192.168.10.10) not reachable    PC4> ping 192.168.10.20  84 bytes from 192.168.10.20 icmp_seq=1 ttl=64 time=1.962 ms  84 bytes from 192.168.10.20 icmp_seq=2 ttl=64 time=1.994 ms  84 bytes from 192.168.10.20 icmp_seq=3 ttl=64 time=1.981 ms  84 bytes from 192.168.10.20 icmp_seq=4 ttl=64 time=1.991 ms  84 bytes from 192.168.10.20 icmp_seq=5 ttl=64 time=1.965 ms    PC4> ping 192.168.10.30  host (192.168.10.30) not reachable  

以太网通道

创建以太网通道可以增加链路的带宽,以及可靠性。


拓扑图

在当前实验的基础上,在交换机之间增加一条链路。

交换机 VLAN 的划分


配置过程

接口配成 Trunk

  • SW1
SW1#conf t  SW1(config)#int f1/3  SW1(config-if)#sw m t  SW1(config-if)#sw t e d  SW1(config-if)#no sh  
  • SW2
SW2#conf t  SW2(config)#int f1/3  SW2(config-if)#sw m t  SW2(config-if)#sw t e d  SW2(config-if)#no sh  

接口绑定到一起

  • SW1
SW1(config-if)#exit  SW1(config)#int range fastEthernet 1/2 - 3  SW1(config-if-range)#channel-group 1 mode on  Creating a port-channel interface Port-channel1  SW1(config-if-range)#  *Mar  1 00:56:50.555: %EC-5-BUNDLE: Interface Fa1/2 joined port-channel Po1  SW1(config-if-range)#  *Mar  1 00:56:53.487: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up  
  • SW2
SW2(config-if)#ex  SW2(config)#int r f1/2 - 3  SW2(config-if-range)#ch 1 m o  Creating a port-channel interface Port-channel1  SW2(config-if-range)#  *Mar  1 01:00:16.955: %EC-5-BUNDLE: Interface Fa1/2 joined port-channel Po1  SW2(config-if-range)#  *Mar  1 01:00:19.875: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up  

故障模拟

验证以太网通道的可靠性,断开两个交换机的f1/2接口,查看连通性。事先使用PC1PC3进行长PING

  • 断开接口
SW1(config-if-range)#ex  SW1(config)#int f1/2  SW1(config-if)#sh  SW1(config-if)#  *Mar  1 01:05:35.947: %EC-5-UNBUNDLE: Interface Fa1/2 left the port-channel Po1  *Mar  1 01:05:35.995: %EC-5-BUNDLE: Interface Fa1/3 joined port-channel Po1  *Mar  1 01:05:36.451: %DTP-5-NONTRUNKPORTON: Port Fa1/2 has become non-trunk  *Mar  1 01:05:36.491: %DTP-5-TRUNKPORTON: Port Fa1/3 has become dot1q trunk  SW1(config-if)#  *Mar  1 01:05:37.887: %LINK-5-CHANGED: Interface FastEthernet1/2, changed state to administratively down  SW1(config-if)#  *Mar  1 01:05:37.947: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up  SW1(config-if)#  *Mar  1 01:05:38.887: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/2, changed state to down  *Mar  1 01:05:38.991: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/3, changed state to up  
SW2(config-if-range)#ex  SW2(config)#int f1/2  SW2(config-if)#sh  SW2(config-if)#  *Mar  1 01:06:57.415: %EC-5-UNBUNDLE: Interface Fa1/2 left the port-channel Po1  *Mar  1 01:06:57.447: %EC-5-BUNDLE: Interface Fa1/3 joined port-channel Po1  *Mar  1 01:06:57.915: %DTP-5-NONTRUNKPORTON: Port Fa1/2 has become non-trunk  *Mar  1 01:06:57.947: %DTP-5-TRUNKPORTON: Port Fa1/3 has become dot1q trunk  SW2(config-if)#  *Mar  1 01:06:59.375: %LINK-5-CHANGED: Interface FastEthernet1/2, changed state to administratively down  SW2(config-if)#  *Mar  1 01:06:59.411: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up  SW2(config-if)#  *Mar  1 01:07:00.375: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/2, changed state to down  *Mar  1 01:07:00.443: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/3, changed state to up  
  • PING 测试
PC1> ping 192.168.10.30 -t  84 bytes from 192.168.10.30 icmp_seq=1 ttl=64 time=1.975 ms  84 bytes from 192.168.10.30 icmp_seq=2 ttl=64 time=1.866 ms  84 bytes from 192.168.10.30 icmp_seq=3 ttl=64 time=1.849 ms  84 bytes from 192.168.10.30 icmp_seq=4 ttl=64 time=0.978 ms  84 bytes from 192.168.10.30 icmp_seq=5 ttl=64 time=1.851 ms  84 bytes from 192.168.10.30 icmp_seq=6 ttl=64 time=1.842 ms  84 bytes from 192.168.10.30 icmp_seq=7 ttl=64 time=1.896 ms  84 bytes from 192.168.10.30 icmp_seq=8 ttl=64 time=1.879 ms  84 bytes from 192.168.10.30 icmp_seq=9 ttl=64 time=1.877 ms  84 bytes from 192.168.10.30 icmp_seq=10 ttl=64 time=1.853 ms  84 bytes from 192.168.10.30 icmp_seq=11 ttl=64 time=1.988 ms  84 bytes from 192.168.10.30 icmp_seq=12 ttl=64 time=1.846 ms  84 bytes from 192.168.10.30 icmp_seq=13 ttl=64 time=1.839 ms  84 bytes from 192.168.10.30 icmp_seq=14 ttl=64 time=1.996 ms  84 bytes from 192.168.10.30 icmp_seq=15 ttl=64 time=1.847 ms  84 bytes from 192.168.10.30 icmp_seq=16 ttl=64 time=1.862 ms  84 bytes from 192.168.10.30 icmp_seq=17 ttl=64 time=1.847 ms  84 bytes from 192.168.10.30 icmp_seq=18 ttl=64 time=1.886 ms  84 bytes from 192.168.10.30 icmp_seq=19 ttl=64 time=1.849 ms  84 bytes from 192.168.10.30 icmp_seq=20 ttl=64 time=1.844 ms  84 bytes from 192.168.10.30 icmp_seq=21 ttl=64 time=1.886 ms  84 bytes from 192.168.10.30 icmp_seq=22 ttl=64 time=1.844 ms  84 bytes from 192.168.10.30 icmp_seq=23 ttl=64 time=1.889 ms  84 bytes from 192.168.10.30 icmp_seq=24 ttl=64 time=1.858 ms  84 bytes from 192.168.10.30 icmp_seq=25 ttl=64 time=1.965 ms  84 bytes from 192.168.10.30 icmp_seq=26 ttl=64 time=1.842 ms  84 bytes from 192.168.10.30 icmp_seq=27 ttl=64 time=1.848 ms  84 bytes from 192.168.10.30 icmp_seq=28 ttl=64 time=1.997 ms  84 bytes from 192.168.10.30 icmp_seq=29 ttl=64 time=1.843 ms  84 bytes from 192.168.10.30 icmp_seq=30 ttl=64 time=1.972 ms  84 bytes from 192.168.10.30 icmp_seq=31 ttl=64 time=1.847 ms  84 bytes from 192.168.10.30 icmp_seq=32 ttl=64 time=1.844 ms  84 bytes from 192.168.10.30 icmp_seq=33 ttl=64 time=0.968 ms  192.168.10.30 icmp_seq=34 timeout  192.168.10.30 icmp_seq=35 timeout  192.168.10.30 icmp_seq=36 timeout  192.168.10.30 icmp_seq=37 timeout  192.168.10.30 icmp_seq=38 timeout  192.168.10.30 icmp_seq=39 timeout  192.168.10.30 icmp_seq=40 timeout  192.168.10.30 icmp_seq=41 timeout  192.168.10.30 icmp_seq=42 timeout  192.168.10.30 icmp_seq=43 timeout  192.168.10.30 icmp_seq=44 timeout  192.168.10.30 icmp_seq=45 timeout  192.168.10.30 icmp_seq=46 timeout  192.168.10.30 icmp_seq=47 timeout  192.168.10.30 icmp_seq=48 timeout  192.168.10.30 icmp_seq=49 timeout  192.168.10.30 icmp_seq=50 timeout  192.168.10.30 icmp_seq=51 timeout  192.168.10.30 icmp_seq=52 timeout  192.168.10.30 icmp_seq=53 timeout  192.168.10.30 icmp_seq=54 timeout  192.168.10.30 icmp_seq=55 timeout  192.168.10.30 icmp_seq=56 timeout  192.168.10.30 icmp_seq=57 timeout  192.168.10.30 icmp_seq=58 timeout  192.168.10.30 icmp_seq=59 timeout  192.168.10.30 icmp_seq=60 timeout  192.168.10.30 icmp_seq=61 timeout  192.168.10.30 icmp_seq=62 timeout  192.168.10.30 icmp_seq=63 timeout  192.168.10.30 icmp_seq=64 timeout  192.168.10.30 icmp_seq=65 timeout  192.168.10.30 icmp_seq=66 timeout  192.168.10.30 icmp_seq=67 timeout  192.168.10.30 icmp_seq=68 timeout  192.168.10.30 icmp_seq=69 timeout  192.168.10.30 icmp_seq=70 timeout  192.168.10.30 icmp_seq=71 timeout  192.168.10.30 icmp_seq=72 timeout  192.168.10.30 icmp_seq=73 timeout  192.168.10.30 icmp_seq=74 timeout  192.168.10.30 icmp_seq=75 timeout  192.168.10.30 icmp_seq=76 timeout  192.168.10.30 icmp_seq=77 timeout  192.168.10.30 icmp_seq=78 timeout  192.168.10.30 icmp_seq=79 timeout  192.168.10.30 icmp_seq=80 timeout  192.168.10.30 icmp_seq=81 timeout  192.168.10.30 icmp_seq=82 timeout  192.168.10.30 icmp_seq=83 timeout  192.168.10.30 icmp_seq=84 timeout  192.168.10.30 icmp_seq=85 timeout  192.168.10.30 icmp_seq=86 timeout  192.168.10.30 icmp_seq=87 timeout  192.168.10.30 icmp_seq=88 timeout  192.168.10.30 icmp_seq=89 timeout  84 bytes from 192.168.10.30 icmp_seq=90 ttl=64 time=1.846 ms  84 bytes from 192.168.10.30 icmp_seq=91 ttl=64 time=1.982 ms  84 bytes from 192.168.10.30 icmp_seq=92 ttl=64 time=1.840 ms  84 bytes from 192.168.10.30 icmp_seq=93 ttl=64 time=1.849 ms  84 bytes from 192.168.10.30 icmp_seq=94 ttl=64 time=1.841 ms  84 bytes from 192.168.10.30 icmp_seq=95 ttl=64 time=1.846 ms  84 bytes from 192.168.10.30 icmp_seq=96 ttl=64 time=1.841 ms  84 bytes from 192.168.10.30 icmp_seq=97 ttl=64 time=1.861 ms  84 bytes from 192.168.10.30 icmp_seq=98 ttl=64 time=0.844 ms  84 bytes from 192.168.10.30 icmp_seq=99 ttl=64 time=0.833 ms  

最后

这是关于使用Trunk实现跨交换机VLAN通信的实验,和以太网通道怎么创建方法。下一篇关于三层交换的实验。

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超哥软件库 » Trunk 实现跨交换机 VLAN 通信