04-01-2009 10:52 PM - edited 03-06-2019 04:57 AM
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.
04-02-2009 01:10 AM
Hi Deepa,
I don't see all your links and other config details, but I can see one thing in your config:
When you changed the routed interface from interface FastEthernet7/24 to interface Vlan182 you forgot to tell the following:
interface FastEthernet7/24
switchport
In other words, interface FastEthernet7/24 remained a layer3 port. You should make it a layer2 port with the "switchport" command.
Cheers:
Istvan
04-02-2009 04:40 AM
Hello Deepa,
EIGRP metric uses also delay and it is cumulative in delay with default K parameters settings
verify the parameters using
sh int vlan 182
sh ip eigrp int vlan 182
compares the different setups you should see some differences
Hope to help
Giuseppe
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