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FRAME RELAY NETWORK TOPOLOGY

THERE IS A FR NETWORK HUB AND SPOKE

IN STAR TOPOLOGY. AT HUB ROUTER THERE ARE POINT-TO-POINT SUBINTERFACES TO SPOKE ROUTERS AND STATIC FR MAP ENTRIES ARE PRESENT. tHE SPOKE ROUTERS COMMUNICATE WITH HUB ROUTER BUT DO NOT COMMUNICATE WITH EACH OTHER.

MY QUESTION IS WHAT TO DO FOR COMMUNICATIONS BETWEEN SPOKE ROUTERS,

1. IS ANY MORE DLCI MAY BE REQUIRED BETWEEN SPOKE ROUTERS?.

2.IS MAP STATEMENT REQUIRED, DLCI WITH IP ADDRESS BETWEEN SPOKE ROUTERS ?

1 REPLY
Hall of Fame Super Silver

Re: FRAME RELAY NETWORK TOPOLOGY

Abdul

There are a couple of things in your question that I hope you can clarify and if so we should be able to get good answers to your question.

At one point you describe the topology as hub and spoke and at another point you describe it as star. Most of us understand these to be two different topologies. So is it hub and spoke or is it star?

Many of us understand hub and spoke to be remote routers connected directly to a central (hub) router while a star is remote routers where some of the remote routers have direct connections to other remotes.

Also you say that the hub has point to point subinterfaces and this is generally the best practice for Frame Relay. Then you say that static FR map entries are present. I do not understand this because with p-t-p subinterfaces you do not need FR maps.

Based on what we have so far I would say that these are the answers to your questions:

1. you might choose to add additional DLCIs but they are not required. any spoke should be able to communicate with any spoke by going to the hub and having the hub forward to the other spoke.

2. No map statements should be required. Part of having p-t-p subinterfaces at the hub is that each spoke is an separate subnet. Therefore from any spoke to any other spoke is just going to a different subnet (through the hub) and no map would be required.

If these answers do not satisfy your requirements then perhaps you can clarify the points about your question.

HTH

Rick

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