From: Kurt VanDerMark (kvandermark@highpoint.com)
Date: Thu Dec 23 2004 - 10:39:01 GMT-3
I'm doing a little frame relay review, trying to make sure I nail down the basics...and I have a few questions.
Please correct anything I say that's wrong...
I understand frame relay can be configured on an interface 3 ways:
- physical interface (considered multipoint)
- subinterface point-to-point
- subinterface multipoint
Say for instance I have a connection going from one router defined as a physical interface, to another router defined via a subinterface. To avoid routing issues such as interface mismatch with IS-IS (any other issues or is this the only one?), I'll want to define the subinterface as multipoint. If the other end of the connection is defined by a physical interface, why wouldn't I always define the subinterface end as multipoint? If you aren't worried about routing issues, is there some advantage to defining that end as point-to-point?? Are there some split-horizon issues?
Also, as a best practice, I understand its best to disable inarp on an interface if you plan to use map statements before bringing the interface up. If you don't plan to use map statements, and want to use dynamic maps, does the FR switch just notify the router about all the mappings it knows about, or does the service provider do filtering on the switch, or how does that work?
Sorry if these are basic questions, but I want to make sure I have this down...
Thanks.
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