RE: Fun with Frame Relay.

Unbelievable!

From: Adrian Brayton [mailto:abrayton_at_gmail.com]
Sent: Monday, August 16, 2010 4:19 PM
To: Narbik Kocharians
Cc: Poplawski, James; Cisco certification
Subject: Re: Fun with Frame Relay.

That is exactly how I was going to reply but Narbik sent it before I could hit
send...

:)

On Aug 16, 2010, at 5:14 PM, Narbik Kocharians wrote:

James,

By default, frame-relay routers generate LMI Status inquiries every 10
seconds, and a full status inquiry every 6th cycle (Every 60 seconds or every
n391 cycle). The interval for status inquiries can be changed using the
"Keepalive" interface configuration command, whereas, the "Frame-relay
lmi-n391dte" command can be used to change the interval for the complete
status inquiries.

Check the output of the following debug command, it shows the status inquiries
and full status inquiries:

On R2

R2#Debug frame lmi

*Nov 24 19:59:57.407: Serial0/0(out): StEnq, myseq 125, yourseen 124, DTE up
*Nov 24 19:59:57.407: datagramstart = 0x3F401ED4, datagramsize = 14
*Nov 24 19:59:57.407: FR encap = 0x00010308
*Nov 24 19:59:57.407: 00 75 95 01 01 01 03 02 7D 7C

*Nov 24 19:59:57.411: Serial0/0(in): Status, myseq 125, pak size 14
*Nov 24 19:59:57.411: RT IE 1, length 1, type 1
*Nov 24 19:59:57.411: KA IE 3, length 2, yourseq 125, myseq 125

*Nov 24 20:00:07.407: Serial0/0(out): StEnq, myseq 126, yourseen 125, DTE up
*Nov 24 20:00:07.407: datagramstart = 0x3F6B0294, datagramsize = 14
*Nov 24 20:00:07.407: FR encap = 0x00010308
*Nov 24 20:00:07.407: 00 75 95 01 01 01 03 02 7E 7D

*Nov 24 20:00:07.411: Serial0/0(in): Status, myseq 126, pak size 14
*Nov 24 20:00:07.411: RT IE 1, length 1, type 1
*Nov 24 20:00:07.411: KA IE 3, length 2, yourseq 126, myseq 126

*Nov 24 20:00:17.407: Serial0/0(out): StEnq, myseq 127, yourseen 126, DTE up
*Nov 24 20:00:17.407: datagramstart = 0x3F400C14, datagramsize = 14
*Nov 24 20:00:17.407: FR encap = 0x00010308
*Nov 24 20:00:17.407: 00 75 95 01 01 01 03 02 7F 7E
*Nov 24 20:00:17.407:
*Nov 24 20:00:17.411: Serial0/0(in): Status, myseq 127, pak size 14
*Nov 24 20:00:17.411: RT IE 1, length 1, type 1
*Nov 24 20:00:17.411: KA IE 3, length 2, yourseq 127, myseq 127

*Nov 24 20:00:27.407: Serial0/0(out): StEnq, myseq 128, yourseen 127, DTE up
*Nov 24 20:00:27.407: datagramstart = 0x3F6AF394, datagramsize = 14
*Nov 24 20:00:27.407: FR encap = 0x00010308
*Nov 24 20:00:27.407: 00 75 95 01 01 01 03 02 80 7F
*Nov 24 20:00:27.407:
*Nov 24 20:00:27.411: Serial0/0(in): Status, myseq 128, pak size 14
*Nov 24 20:00:27.411: RT IE 1, length 1, type 1
*Nov 24 20:00:27.411: KA IE 3, length 2, yourseq 128, myseq 128

*Nov 24 20:00:37.407: Serial0/0(out): StEnq, myseq 129, yourseen 128, DTE up
*Nov 24 20:00:37.407: datagramstart = 0x3F644ED4, datagramsize = 14

*Nov 24 20:00:37.407: FR encap = 0x00010308
*Nov 24 20:00:37.407: 00 75 95 01 01 01 03 02 81 80
*Nov 24 20:00:37.407:
*Nov 24 20:00:37.411: Serial0/0(in): Status, myseq 129, pak size 14
*Nov 24 20:00:37.411: RT IE 1, length 1, type 1
*Nov 24 20:00:37.411: KA IE 3, length 2, yourseq 129, myseq 129

*Nov 24 20:00:47.407: Serial0/0(out): StEnq, myseq 130, yourseen 129, DTE up
*Nov 24 20:00:47.407: datagramstart = 0x3F6B03D4, datagramsize = 14
*Nov 24 20:00:47.407: FR encap = 0x00010308
*Nov 24 20:00:47.407: 00 75 95 01 01 00 03 02 82 81

*Nov 24 20:00:47.419: Serial0/0(in): Status, myseq 130, pak size 59
*Nov 24 20:00:47.419: RT IE 1, length 1, type 0
*Nov 24 20:00:47.419: KA IE 3, length 2, yourseq 130, myseq 130

*Nov 24 20:00:47.419: PVC IE 0x7 , length 0x3 , dlci 102, status 0x2
*Nov 24 20:00:47.419: PVC IE 0x7 , length 0x3 , dlci 103, status 0x2
*Nov 24 20:00:47.419: PVC IE 0x7 , length 0x3 , dlci 104, status 0x2
*Nov 24 20:00:47.419: PVC IE 0x7 , length 0x3 , dlci 105, status 0x0
*Nov 24 20:00:47.419: PVC IE 0x7 , length 0x3 , dlci 106, status 0x0

Note the status inquiries are sent every 10 seconds, these messages are "type
1s", whereas, the complete status inquiries are generated by the local router
every 6th cycle, these message are "type 0" messages, and when the frame-relay
switch receives these messages it responds with all the DLCIs that are
configured for that given router.

Now....as long as you understand this process, no matter how the question is
asked, you will be fine with it. A nasty one will ask you to change the
interval of Type 0 messages.
On Mon, Aug 16, 2010 at 1:34 PM, Adrian Brayton
<abrayton_at_gmail.com<mailto:abrayton_at_gmail.com>> wrote:
If I remember the task correctly, it is looking for a full status update which
occur's every 60 seconds... So you might see something in reference to make
sure that every 6th update occurs in this amount of time or something in that
regard!

On Aug 16, 2010, at 3:13 PM, Poplawski, James wrote:

> Good afternoon,
>
> I'm currently working through Narbik's Advanced CCIE Routing & Switching
Workbook and have a question on the frame-relay lmi-n391dte 3 command. The
lmi-n391dte command in particular. In the exam how am I to determine which
command is needed?
>
> lmi-n391dte set full status polling counter
> lmi-n392dce LMI error threshold
> lmi-n392dte LMI error threshold
> lmi-n393dce set LMI monitored event count
> lmi-n393dte set LMI monitored event count
> lmi-t392dce set DCE polling verification timer
> lmi-type Use CISCO-ANSI-CCITT type LMI
>
> How does one decipher which command is needed and when? I want to be an
expert on Frame Relay, how do I get there?
> JB
>
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Received on Mon Aug 16 2010 - 16:20:19 ART