BACKUP WAN USING SWITCHES AND LAN-EXTENSION

Unanswered Question
Oct 22nd, 2009

Hi

I am trying to implement redundancy between two sites using LAN-EXTENSION from two different Service Providers.The following is the configuration and I want FAILOVER to happen automatically WITH TWO LINKS PLUGGED IN ALL THE TIME .

When I plugin both the links I am not able to connect to SITE A from

SITE B or Vice Versa with the following configuration.IF I SHUTDOWN BACKUP LINK or PRIMARY LINK on SITE B everything is working.Please Advise.Right now I have shutdown interface FastEthernet0/48 on 3550-SITE B and everything seems to be good but I want this interface FastEthernet0/48 on 3550-SITE B to be UNSHUT AND STILL EVERYTHING SHOULD BE WORKING

4006-SITE A#

!

interface FastEthernet2/43---------------------primary Service provider A

description primary-LAN-X

switchport access vlan 24

switchport mode access

speed 100

duplex full

end

!

interface FastEthernet3/12---------------------backup Service Provider B

description BACKUP-LAN-X

switchport access vlan 24

switchport mode access

speed 100

duplex full

end

interface Vlan24

ip address 10.32.0.7 255.255.252.0

ip route 0.0.0.0 0.0.0.0 10.32.0.5

ip route 10.32.64.0 255.255.252.0 10.32.0.1

ip route 10.32.72.0 255.255.254.0 10.32.0.1

3750-SITE B:

interface GigabitEthernet1/0/1---------------cross over connection to 3550-SITE B:interface FastEthernet0/1

switchport mode access

power inline never

interface Vlan1

ip address 10.32.0.1 255.255.252.0

ip route 0.0.0.0 0.0.0.0 10.32.0.5

3550-SITE B:

interface FastEthernet0/1---------------------cross over connection to 3750-SITE B:interface FastEthernet0/1

no ip address

duplex full

speed 100

interface FastEthernet0/47------------------primary Service provider A

description to SERVICE POVIDER A

no ip address

duplex full

speed 100

end

!

interface FastEthernet0/48-----------------backup Service Provider B

description to SERVICE POVIDER B

no ip address

duplex full

speed 100

end

interface Vlan1

ip address 10.32.0.10 255.255.252.0

no ip route-cache

ip default-gateway 10.32.0.1

I have this problem too.
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