I have a triangular topology:
Location A, B & C are connected to each other over a MAN link.
Location A was connected to Location C over MAN links;
Location A :
Switch Config
interface FastEthernet7/24
description : Connecting Location B
no switchport
bandwidth 4096
ip address 10.250.254.66 255.255.255.252
speed 100
duplex full
end
& at Location B end:
Router2:
interface GigabitEthernet0/0
description : Connecting to Location C
bandwidth 4096
ip address 10.250.254.65 255.255.255.252
duplex full
speed 100
end
!
Now, I changed the configuration on Location A's switch as follows:
Location A
Switch:
interface FastEthernet7/24
switchport mode access
switchport access vlan 182
speed 100
duplex full
!
interface Vlan182
description Connecting to Location B
bandwidth 4096
ip address 10.250.254.66 255.255.255.252
!
This was the only change done. After this, location C's traffic to location B was traversing via Location A (though there is a direct link between Location B & C). Howvever location B to location C traffic is properly traversing the link between B & C.
I reverted the configuration on Location - A & checked the status,
Now location C's traffic was traversing via teh direct link to Location B.
Now, once this is working properly, I checked & realised that Location A's traffic to Location B is now traversing via Location C.
Why is this the case? EIGRP is routing protocol in use.
