三层交换跨交换机跨网段通信Word格式.docx

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