三层交换跨交换机跨网段通信Word格式.docx
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SW2-1(config)#interfacerangef0/11-20
SW2-1(config-if-range)#switchportaccessvlan20
SW2-1(config)#intf0/24
SW2-1(config-if)#switchportmodetrunk
SW2-1(config-if)#
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceFastEthernet0/24,changedstatetodown
LineprotocolonInterfaceFastEthernet0/24,changedstatetoup
SW2-1(config-if)#exit
SW2-1(config)#exit
SW2-1#
%SYS-5-CONFIG_I:
Configuredfromconsolebyconsole
SW2-1#showvlanb
VLANNameStatusPorts
----------------------------------------------------------------------------
1defaultactiveFa0/21,Fa0/22,Fa0/23
10VLAN0010activeFa0/1,Fa0/2,Fa0/3,Fa0/4
Fa0/5,Fa0/6,Fa0/7,Fa0/8
Fa0/9,Fa0/10
20VLAN0020activeFa0/11,Fa0/12,Fa0/13,Fa0/14
Fa0/15,Fa0/16,Fa0/17,Fa0/18
Fa0/19,Fa0/20
1002fddi-defaultactive
1003token-ring-defaultactive
1004fddinet-defaultactive
1005trnet-defaultactive
SW2-1#showintf0/24switchport
Name:
Fa0/24
Switchport:
Enabled
AdministrativeMode:
trunk
OperationalMode:
AdministrativeTrunkingEncapsulation:
dot1q
OperationalTrunkingEncapsulation:
NegotiationofTrunking:
On
AccessModeVLAN:
1(default)
TrunkingNativeModeVLAN:
VoiceVLAN:
none
Administrativeprivate-vlanhost-association:
Administrativeprivate-vlanmapping:
Administrativeprivate-vlantrunknativeVLAN:
Administrativeprivate-vlantrunkencapsulation:
Administrativeprivate-vlantrunknormalVLANs:
Administrativeprivate-vlantrunkprivateVLANs:
Operationalprivate-vlan:
TrunkingVLANsEnabled:
ALL
PruningVLANsEnabled:
2-1001
CaptureModeDisabled
CaptureVLANsAllowed:
Protected:
false
Appliancetrust:
2.第二台二层交换机
Switch#conft
Switch(config)#hostnameSW2-2
SW2-2(config)#vlan10
SW2-2(config-vlan)#vlan20
SW2-2(config-vlan)#exit
SW2-2(config)#interfacerangef0/1-10
SW2-2(config-if-range)#switchportaccessvlan10
SW2-2(config-if-range)#interfacerangef0/11-20
SW2-2(config-if-range)#switchportaccessvlan20
SW2-2(config-if-range)#intf0/24
SW2-2(config-if)#switchportmodetrunk
SW2-2(config-if)#
SW2-2(config-if)#exit
SW2-2(config)#exit
SW2-2#
SW2-2#showvlanb
SW2-2#showintf0/24switchport
3.三层交换机
Switch(config)#ho
Switch(config)#hostnameSW3
SW3(config)#vlan30
SW3(config-vlan)#
SW3(config-vlan)#exit
SW3(config)#interfacerangef0/1-10
SW3(config-if-range)#switchportaccessvlan30
SW3(config-if-range)#exit
SW3(config-if)#interfacefa0/23
SW3(config-if)#switchportmodetrunk
Commandrejected:
Aninterfacewhosetrunkencapsulationis"
Auto"
cannotbeconfiguredto"
trunk"
mode.
SW3(config-if)#switchporttrunkencapsulationdot1q
SW3(config-if)#interfacefa0/24
SW3(config-if)#
从上图可以看出,
同网段、同交换机、同vlan可以通信
不同网段、不同交换机、不同vlan不可以通信
如何实现同vlan不同交换机之间通信
在三层上做如下配置:
配置虚拟端口IP
SW3#conft
SW3(config)#vlan10//创建vlan10虚拟端口
%LINK-5-CHANGED:
InterfaceVlan10,changedstatetoup
LineprotocolonInterfaceVlan10,changedstatetoup
SW3(config-vlan)#vlan20//创建vlan20虚拟端口
//配置vlan端口IP和子网掩码做网关
SW3(config)#
SW3(config)#interfacevlan10
SW3(config-if)#ipaddress192.168.10.254255.255.255.0
SW3(config-if)#interfacevlan20
SW3(config-if)#ipaddress192.168.20.254255.255.255.0
SW3(config-if)#interfacevlan30
SW3(config-if)#ipaddress192.168.30.254255.255.255.0
SW3(config-if)#exit
SW3#showvlanb
1defaultactiveFa0/11,Fa0/12,Fa0/13,Fa0/14
Fa0/19,Fa0/20,Fa0/21,Fa0/22
Gig0/1,Gig0/2
10VLAN0010active
20VLAN0020active
30VLAN0030activeFa0/1,Fa0/2,Fa0/3,Fa0/4
SW3#
可以看出相同vlan不同交换机之间通信
不同vlan之间不能通信
如何实现不同vlan之间通信,需要在三层交换机上开启路由功能
SW3(config)#iprouting