CCNA Experiment 14 STP redundant backup link (EtherChannel)

CCNA Experiment 14 STP redundant backup link (EtherChannel)

Environment: Windows XP , GNS3.0.7 , VPCS.exe

Purpose: Learn how to configure redundant backup links.

Steps:

1 , open GNS Create the following project:

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Description:

(1) First to add switching modules for SW1 and SW2 two virtual devices

(2) Note the console port number for both devices: sw1:2002, sw2:2003

(3) Configuration PC1 and PC2 are associated with VPCS using the port number corresponding to the virtual machine (note: Rport and Lport).

2 , Configuration SW1 , open cmd Enter the telnet 127.0.0.1 2002 the log on to SW1 to do the following:

Sw1#vlan Database

SW1 (VLAN) #vlan name V10

Sw1#conf T

SW1 (config) #int fa0/0

SW1 (config-if) #switchport mode acc

SW1 (config-if) #switchport ACC VLAN 10

SW1 (config-if) #exit

SW1 (config) #int Port-channel 1

SW1 (config-if) #switchport mode trunk

SW1 (config-if) #exit

SW1 (config) #port-channel load-balance Src-dst-ip

SW1 (config) #int range F0/1-2

SW1 (config-if-range) #switchport mode trunk

SW1 (Config-if-range) #channel-group 1 mode on

SW1 (Config-if-range) #end

3 , Configuration SW2 , open cmd Enter the telnet 127.0.0.1 2003 the log on to SW2 to do the following:

router>en

Router#conf T

Router (config) #host SW2

SW2 (config) #exit

Sw2#vlan Database

SW2 (VLAN) #vlan name V10

SW2 (VLAN) #exit

Sw2#conf T

SW2 (config) #int fa0/0

SW2 (config-if) #switchport mode acc

SW2 (config-if) #switchport ACC VLAN 10

SW2 (config-if) #no sh

SW2 (config-if) #exit

SW2 (config) #int Port-channel 1

SW2 (config-if) #switchport mode trunk

SW2 (config-if) #exit

SW2 (config) #port-channel load-balance Src-dst-ip

SW2 (config) #int range FA0/1-2

SW2 (config-if-range) #switchport mode trunk

SW2 (Config-if-range) #channel-group 1 mode on

SW2 (Config-if-range) #end

4 , open Vpcs.exe do the following:

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5 , Backup link test:

Login SW1 Close FA0/1 Open FA0/2

Sw1#conf T

SW1 (config) #int FA0/1

SW1 (config-if) #shutdown

SW1 (config-if) #exit

SW1 (config) #int FA0/2

SW1 (config-if) #no shutdown

SW (config-if) #exit

Login SW2 Close FA0//1 Open FA0/2

Sw2#conf T

SW2 (config) #int FA0/1

SW2 (config-if) #shutdown

SW2 (config-if) #exit

SW2 (config) #int FA0/2

SW2 (config-if) #no shutdown

SW2 (config-if) #exit

Test network: (connectivity)

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Login SW1 Open FA0/1 Close FA0/2

SW1 (config) #int FA0/1

SW1 (config-if) #no shutdown

SW1 (config-if) #exit

SW1 (config) #int FA0/2

SW1 (config-if) #shutdown

SW1 (config-if) #exit

Login SW2 Open FA0/1 Close FA0/2

sw2>en

Sw2#conf T

SW2 (config) #int FA0/1

SW2 (config-if) #no sh

SW2 (config-if) #exit

SW2 (config) #int FA0/2

SW2 (config-if) #shutdown

SW2 (config-if) #exit

Test the network again: (connected)

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It is clear from two tests that the backup link is already in effect. Now as long as one of the links is down, the other one will take effect.

This article from "Liu Fengyuan" blog, declined reprint!

CCNA Experimental 14 STP redundant backup link (EtherChannel)