组网及说明
随着网络的高速发展，快速、稳定、冗余、安全的网络环境需求量越来越大，随着避免单点故障、单链路故障的趋势越来越明显，各类的冗余技术的重要性不言而喻，在链路冗余的技术中，链路聚合的技术发挥着重要的作用，不仅可以避免单链路故障，又可以增加链路的带宽，还能起到冗余的效果，以下是二层链路聚合的典型组网配置案例。
网络拓扑图：
网络拓扑图说明：SW1为接入交换机，MSW为汇聚交换机。SW1交换机与MSW交换机采用二层链路聚合互联实现增加带宽、链路冗余的作用。PC接入SW1，属于VLAN 10
配置步骤
1、SW1交换机创建VLAN 10，G1/0/3端口为PC的接入。GI1/0/1和GI1/0/2端口与MSW交换机互联，同时使用二层链路聚合的技术实现捆绑，采用trunk进行数据的传输。
2、MSW交换机创建VLAN 10，并设置VLAN 10的IP和子网掩码，提供终端网关的接入，GI1/0/1和GI1/0/2端口与SW1交换机互联，同时使用二层链路聚合技术实现捆绑，采用trunk进行数据传输。
配置关键点
<H3C>sys
[H3C]sysname SW1
[SW1]vlan 10
[SW1-vlan10]quit
[SW1]int gi 1/0/3
[SW1-GigabitEthernet1/0/3]port link-type access
[SW1-GigabitEthernet1/0/3]port access vlan 10
[SW1-GigabitEthernet1/0/3]description <connect to PC>
[SW1-GigabitEthernet1/0/3]quit
[SW1]int Bridge-Aggregation 1 //创建链路聚合组1
[SW1-Bridge-Aggregation1]quit
[SW1]int range gi 1/0/1 to gi 1/0/2
[SW1-if-range]port link-aggregation group 1 //将链路聚合组应用到接口
[SW1-if-range]quit
[SW1]int Bridge-Aggregation 1 //继续配置链路聚合组1
[SW1-Bridge-Aggregation1]port link-type trunk
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[SW1-Bridge-Aggregation1]undo port trunk permit vlan 1
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[SW1-Bridge-Aggregation1]port trunk permit vlan 10
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[SW1-Bridge-Aggregation1]quit
MSW：
<H3C>sys
[H3C]sysname MSW
[MSW]vlan 10
[MSW-vlan10]quit
[MSW]int vlan 10
[MSW-Vlan-interface10]ip address 192.168.10.1 24
[MSW-Vlan-interface10]quit
[MSW]int Bridge-Aggregation 1
[MSW-Bridge-Aggregation1]quit
[MSW]int range gi 1/0/1 to gi 1/0/2
[MSW-if-range]port link-aggregation group 1
[MSW-if-range]quit
[MSW]int Bridge-Aggregation 1
[MSW-Bridge-Aggregation1]port link-type trunk
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[MSW-Bridge-Aggregation1]undo port trunk permit vlan 1
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[MSW-Bridge-Aggregation1]port trunk permit vlan 10
Configuring GigabitEthernet1/0/1 done.
Configuring GigabitEthernet1/0/2 done.
[MSW-Bridge-Aggregation1]quit
查看链路聚合的状态均为选中状态（S）：
[SW1]dis link-aggregation verbose
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Port: A -- Auto
Port Status: S -- Selected, U -- Unselected, I -- Individual
Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,
D -- Synchronization, E -- Collecting, F -- Distributing,
G -- Defaulted, H -- Expired
Aggregate Interface: Bridge-Aggregation1
Aggregation Mode: Static
Loadsharing Type: Shar
Port Status Priority Oper-Key
--------------------------------------------------------------------------------
GE1/0/1 S 32768 1
GE1/0/2 S 32768 1
[SW1]
[MSW]dis link-aggregation verbose
Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing
Port: A -- Auto
Port Status: S -- Selected, U -- Unselected, I -- Individual
Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation,
D -- Synchronization, E -- Collecting, F -- Distributing,
G -- Defaulted, H -- Expired
Aggregate Interface: Bridge-Aggregation1
Aggregation Mode: Static
Loadsharing Type: Shar
Port Status Priority Oper-Key
--------------------------------------------------------------------------------
GE1/0/1 S 32768 1
GE1/0/2 S 32768 1
[MSW]
查看链路聚合后的速率为2G：
[MSW]dis int brief
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Primary IP Description
InLoop0 UP UP(s) --
MGE0/0/0 DOWN DOWN --
NULL0 UP UP(s) --
REG0 UP -- --
Vlan10 UP UP 192.168.10.1
Brief information on interfaces in bridge mode:
Link: ADM - administratively down; Stby - standby
Speed: (a) - auto
Duplex: (a)/A - auto; H - half; F - full
Type: A - access; T - trunk; H - hybrid
Interface Link Speed Duplex Type PVID Description
BAGG1 UP 2G(a) F(a) T 1
FGE1/0/53 DOWN 40G A A 1
FGE1/0/54 DOWN 40G A A 1
GE1/0/1 UP 1G(a) F(a) T 1
GE1/0/2 UP 1G(a) F(a) T 1
GE1/0/3 DOWN auto A A 1
GE1/0/4 DOWN auto A A 1
[MSW]
[SW1]dis int brief
Brief information on interfaces in route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Primary IP Description
InLoop0 UP UP(s) --
MGE0/0/0 DOWN DOWN --
NULL0 UP UP(s) --
REG0 UP -- --
Brief information on interfaces in bridge mode:
Link: ADM - administratively down; Stby - standby
Speed: (a) - auto
Duplex: (a)/A - auto; H - half; F - full
Type: A - access; T - trunk; H - hybrid
Interface Link Speed Duplex Type PVID Description
BAGG1 UP 2G(a) F(a) T 1
FGE1/0/53 DOWN 40G A A 1
FGE1/0/54 DOWN 40G A A 1
GE1/0/1 UP 1G(a) F(a) T 1
GE1/0/2 UP 1G(a) F(a) T 1
GE1/0/3 DOWN auto A A 10 <connect to PC>
GE1/0/4 DOWN auto A A 1
GE1/0/5 DOWN auto A A 1
PC设置IP，能PING通网关即可：
至此二层链路聚合典型组网配置已完成！
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