From: Antonio Soares (amsoares@netcabo.pt)
Date: Sat Jul 14 2007 - 13:07:37 ART
That's right, as Bob said, the routers understand very well each other
(tested with deb fram packet):
R1 configured with cisco
R2 configured with ieft
R1 sends protocol type=0x800 (IP)
R2 sends NLPID=0x3CC (IP)
+++++++++++++++++++++++++++++++
R1#
*Mar 1 00:22:18.497: Serial0/0(i): dlci 102(0x1861), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:18.497: Serial0/0(o): dlci 102(0x1861), pkt type 0x800(IP),
datagramsize 104
*Mar 1 00:22:18.529: Serial0/0(i): dlci 102(0x1861), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:18.533: Serial0/0(o): dlci 102(0x1861), pkt type 0x800(IP),
datagramsize 104
*Mar 1 00:22:18.565: Serial0/0(i): dlci 102(0x1861), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:18.565: Serial0/0(o): dlci 102(0x1861), pkt type 0x800(IP),
datagramsize 104
*Mar 1 00:22:18.597: Serial0/0(i): dlci 102(0x1861), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:18.601: Serial0/0(o): dlci 102(0x1861), pkt type 0x800(IP),
datagramsize 104
*Mar 1 00:22:18.633: Serial0/0(i): dlci 102(0x1861), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:18.633: Serial0/0(o): dlci 102(0x1861), pkt type 0x800(IP),
datagramsize 104
R1#
+++++++++++++++++++++++++++++++
R2#
*Mar 1 00:22:14.779: Serial0/0(o): dlci 201(0x3091), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:14.811: Serial0/0(i): dlci 201(0x3091), pkt type 0x800,
datagramsize 104
*Mar 1 00:22:14.811: Serial0/0(o): dlci 201(0x3091), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:14.843: Serial0/0(i): dlci 201(0x3091), pkt type 0x800,
datagramsize 104
*Mar 1 00:22:14.847: Serial0/0(o): dlci 201(0x3091), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:14.879: Serial0/0(i): dlci 201(0x3091), pkt type 0x800,
datagramsize 104
*Mar 1 00:22:14.879: Serial0/0(o): dlci 201(0x3091), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:14.911: Serial0/0(i): dlci 201(0x3091), pkt type 0x800,
datagramsize 104
*Mar 1 00:22:14.915: Serial0/0(o): dlci 201(0x3091), NLPID 0x3CC(IP),
datagramsize 104
*Mar 1 00:22:14.947: Serial0/0(i): dlci 201(0x3091), pkt type 0x800,
datagramsize 104
R2#
+++++++++++++++++++++++++++++++
So in the lab i wouldn't change anything unless they ask me.
And we need to remember that IEFT is only necessary to interoperate with
non-Cisco routers.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bob
Sinclair
Sent: sabado, 14 de Julho de 2007 14:09
To: nhatphuc
Cc: Cisco certification
Subject: Re: Is FR encapsulation between DTEs?
nhatphuc wrote:
> Hi Group,
>
> Sorry for my basic question. I need your help on this:
>
> My network diagram:
>
> R1----(FRS)----R2
>
> I configure Frame Relay on R1 using Cisco type and R2 using IETF.
>
> I thought it wouldn't work because encapsulation is for routers (DTE)
> only. But it worked. I can ping from R1 to R2 and vice versa.
>
> Can you explain why it is so? Or I misunderstood this basic concept?
Phuc,
In theory it is just as you say: Frame-relay DTE encapsulations need to
match. However in practice the Cisco router can read all of the
encapsulations and mismatched encapsulation does actually work.
Hth,
--Bob Sinclair CCIE 10427 CCSI 30427 www.netmasterclass.net
This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:41 ART