Your point about frame map statements and layer 3 addresses brings up and interesting point. You CAN have a different kind of frame-relay encapsulation on different PVCs, and you do this with frame relay map statements.
I don't have time to test it now, but I remember learning that to use frame relay IP TCP header compression, you have to use the proprietary Cisco frame relay encapsulation. So if you want to use frame relay IP TCP header compression or RTP header compression on a PVC, you configure compression using a frame map statement and that PVC then uses Cisco FR encaps (I think it is automatically transformed into a cisco FR encaps PVC). Similarly, if you have frame relay IP TCP header compression on the physical interface, you can turn off compression on a per-PVC basis using your frame map statements ("nocompress" comes at the end). So, you CAN have different encapsulations on a per PVC, sort of. I think all this business of cisco encapsulation working on a PVC when the interface is set to ietf (and the frame relay switch is configured for ietf) works because the FR switch doesn't really care what kind of FR encapsulation is used on each PVC, while it does care a lot about the lmi-type. The remote router needs to be set to the correct kind of FR encapsulation, though (but, again, this can be set per PVC.) Please feel free to correct me if I am wrong in any particular. I would hate to have misremembered all or some of this. Tom Larus, CCIE 10,104 ""Srivathsan Ananthachari"" wrote in message news:[EMAIL PROTECTED] > If it's possible to assign a network address ( IP / IPX viz., ) to the > FR sub-interface why not be able to specify encap as well..?? > > I hope I'm not draggin it.../ > > Srivathsan > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Mwalie W > Sent: Thursday, June 26, 2003 12:42 PM > To: [EMAIL PROTECTED] > Subject: RE: Subinterfaces [7:71421] > > > Hi, > > Well, encapsulation is done prior to placing the packets(Frames) to the > physical medium - I guess it should be done on the physical interface. > > I would be interested in what other members have to say, but I think it > makes sense that it should be on the physical interface. > > Mwalie Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=71446&t=71421 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]