Using Routers And VLANS Over AT&T's Opt-E-Man
Posted on 2007-10-18
I have 2 sites on AT&T's Opt-E-Man. Presently, they are connected via a Cisco 6509 at the main data center to AT&T's Cisco 3560 then to the cloud. At the remote sites, AT&T's Cisco 3650 hands it off to a Cisco 3570 and on to the users. The problem with this setup is that AT&T has a 50 MAC address per site limit so we have to pay extra every month for any number over that. A router will show up as just one MAC address to AT&T. Also, I have Packeteer PacketShapers that I can't use without a router.
What I want to do is connect them all with a Cisco 3640 at each site and a Cisco 7204 at the main site using FastEthernet ports.
This is all I can get from AT&T on the subject:
Cisco routers that support 802.1q:
The following configuration is required by any Cisco Systems, Inc. router running IOS software and attempting to use a routed interface to connect to a Layer2 vlan interface.
Interface Fastethernet 1/0.100
Encapsulation dot1q 2 (vlan 2 is configured for this sub interface)
Ip address 10.1.1.1 255.255.255.252
Interface Fastethernet 1/0.200
Encapsulation dot1q 5 (vlan 5 is configured for this sub interface)
Ip address 10.1.1.2 255.255.255.252
I've also heard that VLANs over IP unnumbered subinterfaces is a possibility, but I can't quite grasp the concept.
Thanks in advance for your time.