02-26-2009 06:58 PM - edited 03-06-2019 04:17 AM
Hi every body!
suppose we have router"R1" with integrated T1 card.
R1--------------frame relay switch at CO
ppp protocol is used to connect R1 to frame relay switch. My questions are:
1)Does " data field" in ppp header contain " frame relay frame" ? if yes then what " type" field in ppp header contains ?
Thanks a lot!
Solved! Go to Solution.
02-26-2009 07:08 PM
Sarah
I am a bit confused about your question. If R1 is connected to a frame relay switch at CO then why would the router not have encapsulation frame-relay? why would it try ppp encapsulation?
HTH
Rick
02-26-2009 07:22 PM
Sarah
There are many protocols which support point to point serial connections. It is certainly not limited to ppp. The common solution when a router is connected to a frame relay switch by T1 is to use encapsulation frame relay on the serial link. The data link protocol is Frame Relay.
HTH
Rick
02-26-2009 07:41 PM
02-26-2009 07:08 PM
Sarah
I am a bit confused about your question. If R1 is connected to a frame relay switch at CO then why would the router not have encapsulation frame-relay? why would it try ppp encapsulation?
HTH
Rick
02-26-2009 07:14 PM
Thanks a lot for your reply!
i was reading my book , it says r1 is connected by T1 to frame relay switch. Since this is the point to point connection between frame relay switch and r1, i assume ppp must be used to carry frame relay as pay load. Could you please explain how the router is connected to frame relay switch? what data link protocol is used between the router and frame relay switch?
thanks a lot!
02-26-2009 07:22 PM
Sarah
There are many protocols which support point to point serial connections. It is certainly not limited to ppp. The common solution when a router is connected to a frame relay switch by T1 is to use encapsulation frame relay on the serial link. The data link protocol is Frame Relay.
HTH
Rick
02-26-2009 07:38 PM
Thanks Rick! So R1 simply encapsulates ip packet in frame relay frame and forwards it to frame relay switch?
02-26-2009 07:41 PM
Sarah
Yes. That is the common way of doing it.
HTH
Rick
02-26-2009 07:45 PM
thanks a lot Rick!
02-26-2009 07:50 PM
Sarah
You are quite welcome. When you do not have the experience of having done it, some of these concepts are a bit hard to understand.
I am pleased to see the increase in your understanding in your continuing posts to the forum.
Thanks for the ratings.
HTH
Rick
02-26-2009 11:41 PM
by the way
some times frame relay over PPP is useful wen:
u want have some authentication as frame relay lack to this feature with FR over PPP u can hav authentication through chap or pap
also if you want to hav multiline topology
with FR over PPPmultilinke you can do it as well
Hope this helps as well :)
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