Re: Frame Relay LAPF - LMI

Thanks. Very good explanations.

________________________________
From:
Darby Weaver <darby.weaver_at_gmail.com>
To: CCIE League <ccieleague_at_ymail.com>
Cc: CCIEGS <ccielab_at_groupstudy.com>
Sent: Friday, 11 September, 2009 5:51:30
Subject: Re: Frame Relay LAPF - LMI

LMI - Sends Status Updates (Network) and
Status Enquiry (User) messages about DLCI changes/adds/delations etc.
Heartbeat Process... Control-Plane (involved in the establishment and
termination of logical connections).

LAPF - Used for carrying user data
traffic (LAPF-Core Protocol). User-Plane (Responsible for the transfer of
user data between subscribers - think between frame relay switches of svc
circuits).

1. Down.

2. LAPF won't come up because you have disabled
keepalives which are the "Heartbeat Process" aka LMI and since your DLCI's are
"static", exactly what information are you seeking to exchange anyway? Since
there is no need to exchange the status of DLCI's a status of Down is
inconsequential to the flow of data traffic. LAPF is considered a User Plane
Protocol between 2 NNI networks for example and therefore will not be
necessary or useful between a the end device and the frame switch in a UNI
network relationship.

 
On Thu, Sep 10, 2009 at 8:37 PM, CCIE League
<ccieleague_at_ymail.com> wrote:

Experts,
>
>
>What is the role of LAPF related
to LMI?
>
>
>1. If LMI is disabled (with no keepalive) & DLCI status is
STATIC, will LAPF be used, will it come up, or will it be disabled or DOWN?
>
>2. If using back to back FR with no LMI (no keepalive) & the PVC status will
be STATIC - why would LAPF not come up?
>
>
>Thanks in advanced for the
explanation...
>
>
>Blogs and organic groups at http://www.ccie.net
>
>_______________________________________________________________________
>Subscription information may be found at:
>http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Darby
Weaver
Network Engineer
407-802-7394
darbyweaver_at_yahoo.com
Blogs and organic groups at http://www.ccie.net