From: Scott Morris (smorris@ipexpert.com)
Date: Tue Oct 09 2007 - 13:20:46 ART
Other vendors routers do support cisco LMI type (actually it's Northern
Telecom's LMI type, but who's counting?). But you're correct, they do NOT
support Cisco encapsulation in the frame packets.
Two different pieces, but one that often causes confusion!
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Felix Nkansah
Sent: Tuesday, October 09, 2007 12:08 PM
To: Cisco certification
Subject: Fwd: Frame Relay Encapsulation and LMI types
Hi Grace,
There's a difference between the frame relay LMI type and the frame relay
encapsulation.
There are 3 different LMI types, and you need to configure your router to
match whatever is being used by the frame relay switch. However, routers
usually 'autosense' for the LMI type and as such the engineer doesnt need to
manually enter it.
However, if the lab requirements dictates that you use a particular type,
you must enter it on the router interface regardless of whether it
automatically senses it or not.
Concerning the frame relay encapsulation, it is usually cisco or ietf. The
'cisco' encapsulation is proprietary and supported by cisco routers only.
It's your lab that would dictate or imply whether you use the default
'cisco' encapsulation or the 'ietf' method.
In short, LMI is a Router-to-FrameSwitch affair, whereas the encapsulation
is Router-to-Router affair. Watch what your lab tells you!
Regards,
Felix
On 10/9/07, Grace Simon <SimonG@pcsystems.gr> wrote:
>
> Hi Guys,
>
>
>
> Does anyone know why in the internetworkexpert labs some of the
> frame-relay routers have the following commands:
>
>
>
> frame-relay lmi-type cisco
>
> encapsulation frame-relay IETF
>
>
>
> I've never seen frame relay in the real world and only played with it
> in the labs so my knowledge is a little limited.
>
> I've re-configured the device in question with just the following
>
>
>
> encapsulation frame-relay
>
>
>
> and completely done away with the frame-relay lmi-type and everything
> is working hunky dory.
>
>
>
> Just making sure this isn't something I need to consider in the real
> lab
>
>
>
> Cheers,
>
>
>
> Simon.
>
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