WAN Interface mode Configuration

[matthewlogan46]

Hi,

Which of the following configuration is the best or the recommended to connect two site?.

Topology:

SwitchLayer3GE0/1 -10.0.0.1---> ----> <----<--10.0.0.2-- GE0/1SwitchLayer3-02

Configuration Number 1-Interface Routing:

Switch Layer3-01

interface GE 0/1

no switchport

ip add 10.0.0.1 255.0.0.0

exit

Switch Layer3-02

interface GE 0/1

no switchport

ip add 10.0.0.2 255.0.0.0

exit

Configuration Number 2-Interface mode Trunk.

Switch Layer3-01

interface GE 0/1

switchport

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10

exit

interface vlan 10

ip add 10.0.0.1 255.0.0.0

exit

Switch Layer3-02

interface GE 0/1

switchport

switchport mode trunk

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 10

exit

interface vlan 10

ip add 10.0.0.2 255.0.0.0

exit

[Jon Marshall]

Matthew

Given the choice i would usually go with the routed interface setup because this means you do not run L2 protocols across the link, the key one being STP. With the trunk setup an STP problem in one site could have a knock on effect to the other site.

However if there is a requirement to have the same vlan in both sites ie. you need L2 adjacency for some devices split between the sites then you have to use the trunk option.

Jon