Jarred- For what you describe, this is my interpretation. If you have all of the buildings in each "block" connected to each other via fiber, then you could say that they are all connecting together via Fiber ports on LAN switches (for instance, a 4006 or 6509 catalyst switch). Your choice, but for network management, you can put each building in that block in it's own VLAN, or keep them all in VLAN 1 (the VLAN 1 option would be referred to as a "Flat" network). Of course, depending on how many nodes are in each building, you may have to use the multiple VLAN solution anyway.. i.e., more than 253 nodes. If you chose to go with Multi-VLAN scenario, you obviously have to have the Switches configured with a Route Module in the switch, or use an external Router in trunking fashion to allow all VLANs to communicate with each other. Note that the Fiber links are point-to-point, and in your full control (from my understanding at least).
For the second set of buildings that make up the second "block", you mirror the configuration of the first block, using different unique subnets for the those VLANs. For connecting the two blocks together, you order and place point-to-point T3 circuits between the two blocks. This point-to-point circuit is dedicated, and only YOUR Traffic traverses the circuit, whether it be a Lease Line, or a Frame Relay PVC. You don't care how the Telco gets the signal from point A to B, all you care is that its working and from your Routers' point of view, it seems as if you have a back-to-back crossover cable connecting the two offices together. Now that's simplified, but it really isn't much more complicated than that. With the two offices, you would either use the same Router that you used to do the Trunking of the VLANs with, or you use a separate Router that just has an Ethernet port with an address of one of the subnets for each block site. Optionally, I think you can even get a T3 Card for the 6509, but I could be wrong on that one. If you could , your equipment footprint would be small, but you would need to make sure that you have redundancy or hot-spares for some of the components in case of failure. And to answer your question about EIGRP... since the two offices are connected via a P-t-P T3, which again, is a dedicated circuit for YOU only, yes, you could run it as your Routing Protocol and the telco would not interfere with communications... unless they have a joe in some remote Central Office start mucking around and pull one of the clips off of your circuit cross-connect by accident, not realize he's done so, and leave the facility.... effectively killing your circuit.... then your EIGRP Network is interrupted by connectivity failure. :) Hope that answered your questions.... I'm sure someone else will print a similar picture for you... and hopefully, I didn't overlook something....:) Good luck on Semester Finals! Mark -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, May 08, 2002 7:28 AM To: [EMAIL PROTECTED] Subject: RE: Phone networks [7:43498] Thanks Chris, that helps understand the scenario for Frame Relay. I figured the switches weren't delt with by the administrator of the network, however my intended question still remains unanswered. Let me be as specific as I can. Scenario: I have 6 buildings, 3 in one industrial park and 3 in another. I link each set of 3 together via fiber for say. Then, I want a dedicated T3 linking the two sets of 3 buildings together. Let me say I am using EIGRP and I wanted to put all 6 into the same AS. Is this possible? What I mean is, will the phone company or whatever ISP that is dealing with the bandwidth, allow the T3 to only run directly between the two buildings, so that one router in building 3 and another in building 6 will see each others as neighbors via that T3, or do they have to be seperate AS #s in the case that they were not able to pass routing information, and thus use an external routing protocol or static routes (whatever the ISP uses)? I know I might not be making sense, but I just do not know how the "behind the scenes" stuff goes on. I know for a fact it is possible to do what my scenario calls for, but I just do not get how the ISP manages that. I suppose with some experience I might understand, but I'm only a 17 year old in highschool, who is graduating in a month and is also taking his first CCNP exam in a month, so I have ZERO (0) experience thus far. Thanks for you help everyone. Jarred CCNA Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=43616&t=43498 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
