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New Member

Routing Between gig WAN connection 3750's

We have a gig connection between two locations through our ISP. On both ends, each connection is going into a 3750-12S. The ISP's provisioning requires each port to be a trunk with dot1q encapsulation.

I need to route data between these two locations. We are currently using EIGRP on both ends, and doing inter-vlan routing. Since I need to have the interface setup as a switchport, and can not assign it an IP address how can I route data between each location?

A little information on vlan routing structure:

Location A

Eigrp 1

network 192.168.1.0

network 192.168.2.0

network 192.168.3.0

etc.

etc.

etc.

Location B

Eigrp 1

network 192.168.4.0

network 192.168.5.0

network 192.168.14.0

network 192.168.15.0

etc.

etc.

etc.

This is probably a very simple configuration and I am looking to hard at the solution, so please pass on your suggestions.

Thanks,

Al

4 REPLIES
New Member

Re: Routing Between gig WAN connection 3750's

Hi,

Is it possible to post complete configuration of both locations.

New Member

Re: Routing Between gig WAN connection 3750's

Attached are the configurations for each location. Thank you.

Silver

Re: Routing Between gig WAN connection 3750's

If you want plain L3 connectivity, you can create a point-to-point VLAN.

E.g. create a VLAN 555 on both switches, assign interface VLAN 555 with address 1.1.1.1 255.255.255.252 on one side, and 1.1.1.2 255.255.255.252 on the other side.

Add the network to the EIGRP routing process.

On interface to the provider, configure trunk, with allowed VLAN only 555, eg:

interface GigabitEthernetX/X/X

description to_provider

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 555

switchport mode trunk

Numbers are only for example ofcourse, but that's how we have it set up. Therefore all connectivity between the two switches is in layer 3 only (EIGRP)

New Member

Re: Routing Between gig WAN connection 3750's

Thanks I'll try that out.

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