快速生成樹配置

實驗名稱：端口聚合配置

實驗目的：理解端口聚合的工作原理，掌握如何在交換機上配置端口聚合。

實驗原理：端口聚合（Aggregate-port）又稱鏈路聚合，是指兩臺交換機之間在物理上將多個端口

連接起來，將多條鏈路聚合成一條邏輯鏈路。從而增大鏈路帶寬，解決交換網絡中因帶寬引

起的網絡瓶頸問題。多條物理鏈路之間能夠相互冗余備份，其中任意一條鏈路斷開，不會影

響其他鏈路的正常轉發數據。

端口聚合遵循 IEEE 802.3ad 協議的標準。

實驗設備：兩臺交換機（三層二層各一臺），兩臺電腦（配置生成樹信息）

實驗步驟：

第一步：配置兩臺交換機的主機名和管理 IP  地址

S3750#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

S3750(config)#hostname L3-SW

L3-SW(config)#interface vlan 1

L3-SW(config-if)#Dec 3 01:03:22 L3-SW %7:%LINE PROTOCOL CHANGE:

Interface VLAN 1, changed state to UP

L3-SW(config-if)#ip address 192.168.1.1 255.255.255.0

L3-SW(config-if)#no shutdown

L3-SW(config-if)#exit

Switch#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)#hostname L2-SW

L2-SW(config)#interface vlan 1

L2-SW(config-if)#ip address 192.168.1.2 255.255.255.0

L2-SW(config-if)#no shutdown

L2-SW(config-if)#exit

第二步：在兩臺交換機上配置聚合端口

L3-SW(config)#interface range fastEthernet 0/1-2

L3-SW(config-if-range)#port-group 1

！將端口 Fa0/1~2 加入聚合端口 1，同時創建該聚合端口

L3-SW(config-if-range)#Dec 3 01:03:57 L3-SW %7:%LINE PROTOCOL CHANGE:

Interface AggregatePort 1, changed state to UP

Dec 3 01:03:58 L3-SW %7:%LINK CHANGED: Interface FastEthernet 0/1, changed

state to administratively down

Dec 3 01:03:58 L3-SW %7:%LINE PROTOCOL CHANGE: Interface FastEthernet

0/1, changed state to DOWN

Dec 3 01:03:58 L3-SW %7:%LINK CHANGED: Interface FastEthernet 0/2, changed

state to administratively down

L3-SW(config-if-range)#exit

L3-SW(config)#

L2-SW(config)#interface range fastEthernet 0/1-2

L2-SW(config-if-range)#port-group 1

！將端口 Fa0/1~2 加入聚合端口 1，同時創建該聚合端口

L2-SW(config-if-range)#exit

L2-SW(config)#

第三步：將聚合端口設置為 Trunk

L3-SW(config)#interface aggregateport 1

L3-SW(config-if)#switchport mode trunk

L3-SW(config-if)#exit

L3-SW(config)#

L2-SW(config)#interface aggregatePort 1

L2-SW(config-if)#switchport mode trunk

L2-SW(config-if)#exit

L2-SW(config)#

第四步：設置聚合端口的負載平衡方式

L3-SW(config)#aggregateport load-balance ?

！查看交換機支持的負載平衡方式

dst-ip Destination IP address

dst-mac Destination MAC address

ip Source and destination IP address

src-dst-mac Source and destination MAC address

src-ip Source IP address

src-mac Source MAC address

L3-SW(config)#aggregateport load-balance dst-mac

！設置負載平衡方式為依據目的地址進行，默認是依據源和目的地址

L3-SW(config)#exit

L2-SW(config)#aggregatePort load-balance ?

！查看交換機支持的負載平衡方式

dst-mac Destination MAC address

ip Source and destination IP address

src-mac Source MAC address

L2-SW(config)#aggregatePort load-balance dst-mac

！設置負載平衡方式為依據目的地址進行，默認是依據源地址

L2-SW(config)#exit

第五步：查看聚合端口的配置

L3-SW#show aggregatePort load-balance

Load-balance : Destination MAC

L3-SW#

L3-SW#show aggregatePort summary

AggregatePort MaxPorts SwitchPort Mode Ports

------------- -------- ---------- ------ ----------------------------------

Ag1 8 Enabled TRUNK Fa0/1 ,Fa0/2

L3-SW#

L3-SW#show interfaces aggregateport 1

Index(dec):29 (hex):1d

AggregatePort 1 is UP , line protocol is UP

Hardware is Aggregate Link AggregatePort

Interface address is: no ip address

MTU 1500 bytes, BW 1000000 Kbit

Encapsulation protocol is Bridge, loopback not set

Keepalive interval is 10 sec , set

Carrier delay is 2 sec

RXload is 1 ,Txload is 1

Queueing strategy: WFQ

Switchport attributes:

interface's description:""

medium-type is copper

lastchange time:337 Day: 1 Hour: 3 Minute:56 Second

Priority is 0

admin duplex mode is AUTO, oper duplex is Full

admin speed is AUTO, oper speed is 100M

flow control admin status is AUTO,flow control oper status is OFF

broadcast Strom Control is OFF,multicast Strom Control is OFF,unicast Strom

Control is OFF

Aggregate Port Informations:

Aggregate Number: 1

Name: "AggregatePort 1"

Refs: 2

Members: (count=2)

FastEthernet 0/1 Link Status: Up

FastEthernet 0/2 Link Status: Up

L3-SW#

L2-SW#show aggregatePort load-balance

Load-balance : Destination MAC address

L2-SW#

L2-SW#show aggregatePort summary

AggregatePort MaxPorts SwitchPort Mode Ports

------------- -------- ---------- ------ -----------------------

Ag1 8 Enabled Trunk Fa0/1 , Fa0/2

L2-SW#

L2-SW#show interfaces aggregatePort 1

Interface : AggregatePort 1

Description :

AdminStatus : up

OperStatus : up

Hardware : -

Mtu : 1500

LastChange : 0d:0h:0m:0s

AdminDuplex : Auto

OperDuplex : Full

AdminSpeed : Auto

OperSpeed : 100

FlowControlAdminStatus : Off

FlowControlOperStatus : Off

Priority : 0

Broadcast blocked :DISABLE

Unknown multicast blocked :DISABLE

Unknown unicast blocked :DISABLE

L2-SW#

第六步：驗證配置

在三層交換機 L3-SW 上配置另一個用于測試的 VLAN 10，配置 IP 地址為

192.168.10.1/24，然后在二層交換機 L2-SW 上配置默認網關（其作用相當于主機的網關，

交換機可將發往其他網段的數據包提交給網關處理），這樣 L2-SW 可以 ping 通

192.168.1.1/24 和 192.168.10.1/24，說明聚合端口的 Trunk 配置已經生效。

L3-SW(config)#vlan 10

L3-SW(config-vlan)#exit

L3-SW(config)#

L3-SW(config)#interface vlan 10

L3-SW(config-if)#iDec 3 01:16:02 L3-SW %7:%LINE PROTOCOL CHANGE:

Interface VLAN 10, changed state to UP

L3-SW(config-if)#ip address 192.168.10.1 255.255.255.0

L3-SW(config-if)#no shutdown

L3-SW(config-if)#exit

L2-SW(config)#ip default-gateway 192.168.1.1

！設置二層交換機的默認網關

L2-SW(config)#exit

L2-SW#

L2-SW#ping 192.168.1.1

Sending 5, 100-byte ICMP Echos to 192.168.1.1,

timeout is 2000 milliseconds.

!!!!!

Success rate is 100 percent (5/5)

Minimum = 1ms Maximum = 1ms, Average = 1ms

L2-SW#ping 192.168.10.1

Sending 5, 100-byte ICMP Echos to 192.168.10.1,

timeout is 2000 milliseconds.

!!!!!

Success rate is 100 percent (5/5)

Minimum = 1ms Maximum = 1ms, Average = 1ms

在三層交換機 L3-SW 上長時間的 ping 二層交換機 L2-SW，然后斷開聚合端口中的

Fa0/2 端口：

L3-SW#ping 192.168.1.2 ntimes 1000

Sending 1000, 100-byte ICMP Echoes to 192.168.1.2, timeout is 2 seconds:

< press Ctrl+C to break >

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (1000/1000), round-trip min/avg/max = 1/1/10 ms

可以看到在斷開聚合端口中的 Fa0/2 端口時是沒有丟包的。再次實驗，此次斷開 Fa0/1

端口：

L3-SW#ping 192.168.1.2 ntimes 1000

Sending 1000, 100-byte ICMP Echoes to 192.168.1.2, timeout is 2 seconds:

< press Ctrl+C to break >

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 99 percent (999/1000), round-trip min/avg/max = 1/1/10 ms

實驗過程圖：