一、组网需求：

在实际组网中经常会遇到Cisco交换机与H3C交换机采用链路聚合互联的问题，此案例以Cisco交换机和H3C交换机聚合链路互联为例介绍互联互通的配置。

二、组网图：

如上图所示，Cisco交换机与H3C交换机通过多条链路进行链路聚合。

三、配置步骤：

1、Cisco交换机上的配置如下。

#

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

#

interface FastEthernet0/21

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode on

#

interface FastEthernet0/22

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode on

#

interface FastEthernet0/23

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode on

#

interface FastEthernet0/24

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode on

2、H3C交换机上的配置如下。

#

interface Bridge-Aggregation2

description To-LVS\VPN\Man\INT

port link-type trunk

port trunk permit vlan all

#

interface GigabitEthernet1/0/21

port link-type trunk

port trunk permit vlan all

port link-aggregation group 2

#

interface GigabitEthernet1/0/22

port link-type trunk

port trunk permit vlan all

port link-aggregation group 2

#

interface GigabitEthernet1/0/23

port link-type trunk

port trunk permit vlan all

port link-aggregation group 2

#

interface GigabitEthernet1/0/24

port link-type trunk

port trunk permit vlan all

port link-aggregation group 2

四、配置关键点：

1.在Cisco交换机上，可以通过以下命令查看端口聚合状态

Switch#show etherchannel summary

Flags:  D - down        P - in port-channel

I - stand-alone s - suspended

H - Hot-standby (LACP only)

R - Layer3      S - Layer2

U - in use      f - failed to allocate aggregator

u - unsuitable for bundling

w - waiting to be aggregated

d - default port

Number of channel-groups in use: 1

Number of aggregators:           1

Group  Port-channel  Protocol    Ports

------+-------------+-----------+---------------------------------

1      Po1(SU)          -        Fa0/21(P)   Fa0/22(P)  Fa0/23(P) Fa0/24(P)