I just helped a friend with almost the exact same problem. They have two sites connected via a T1 but want use the DSL connection at one site. They have workstations at each end and want to use the same subnet. Since they don't have any other use for the T1 I used a modified configuration similar to Example 3 in the link below:
http://www.cisco.com/warp/public/701/37.html This gives an example of using transparent bridging to get traffic between two Ethernet interfaces separated by routers and a T1. The thing that the article does not mention is that you need to turn off IP routing on the interfaces doing the bridging. In my case I could just use "no ip routing" (I never thought I would use that command on a live network), but you may need something more granular like IRB. The Caslow book has some simple explanations of IRB. Sincerely, John Dorffler CCIE #6677 ""Jeffrey Reed"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I have a scenario where I want to move part of two VLANs to a remote > building off campus. These two VLANs are already part of my internal network > and due to some layer 8 constraints, we cant put them on new subnets once > we move them to the new building. The VLANs need to be at both the remote > office as well as the core of the network. Connectivity will be facilitated > by a T1 and a pair of 1721s. I know the 1721s will run 802.1Q, but can I > bridge the two VLANs across the T1? I know its not a good idea to send > broadcasts across an expensive T1, but were dealing with folks who do not > care. > > I wasnt sure how the WAN side would handle dot1q tagging. Thanks for any > thoughts!! > > > Jeff Reed > Confidential e-mail for addressee only. Access to this e-mail by anyone > else is unauthorized. If you have received this message in error, please > notify the sender immediately by reply e-mail and destroy the original > communication. 1 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47561&t=47440 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
