4.配置端口聚合提供冗余备份链路

一、背景

假设某企业采用两台交换机组成一个局域网，由于很多数据流量是跨交换机进行转发的，因此需要提高交换机之间的传输带宽，并实现链路的冗余备份。为此，网络管理员在两台交换机之间采用两根网线互联，并将相应的两个端口聚合为一个逻辑端口。现要在交换机上做适当配置，达到增加交换机之间传输带宽，并实现链路冗余备份的目标。

cisco模拟器2960系列没有端口聚合命令，所以用了一个三层交换机3560做

二、拓扑图

PC0:192.168.10.1 255.255.255.0

PC1:192.168.10.2 255.255.255.0

三、配置案例

g关闭生成树协议

1.1 由于思科交换机默认开启生成树协议，所以，要实现端口聚合，需要关闭生成树协议

先查看默认vlan状况

Switch#enable

Switch#show vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                                Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                                Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                                Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                Fa0/21, Fa0/22, Fa0/23, Fa0/24
1002 fddi-default                     active    
1003 token-ring-default               active    
1004 fddinet-default                  active    
1005 trnet-default                    active    

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0   
1003 tr    101003     1500  -      -      -        -    -        0      0   
1004 fdnet 101004     1500  -      -      -        ieee -        0      0   
1005 trnet 101005     1500  -      -      -        ibm  -        0      0   

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

Remote SPAN VLANs
------------------------------------------------------------------------------

Primary Secondary Type              Ports
------- --------- ----------------- ------------------------------------------

1.2 然后关闭生成树协议

Switch(config)#no spanning-tree vlan 1
Switch(config)#end

两个交换机进行相同操作

聚合端口

配置：

Switch>enabe

Switch#configure terminal

Switch(config)#interface port-channel 1        //配置聚合组一

Switch(config-if)#interface range fastethernet 0/1-2    //将0/1和0/2接口分给第一组

Switch(config-if-range)#channel-group 1 mode on

Switch(config-if-range)#end

Switch#show running-config

Switch#show running-config 
Building configuration...
Current configuration : 1118 bytes
!
version 12.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
!
!
!
no spanning-tree vlan 1
spanning-tree mode pvst
spanning-tree extend system-id
!
interface Port-channel1
!
interface FastEthernet0/1
 channel-group 1 mode on
!
interface FastEthernet0/2
 channel-group 1 mode on
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface Vlan1
no ip address
 shutdown
!
!
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
!
!
end

两个交换机进行同样的操作

5. 设置PC配置与验证测试

5.1 PC1

ip:192.168.10.1

MASK:255.255.255.0

5.2 PC2

ip:192.168.10.2