From: Narbik Kocharians (narbikk@gmail.com)
Date: Mon Jan 12 2009 - 18:33:44 ARST
You should NOT look for words, you should focus on knowing what it does and
where to use it and how and where it helps.
The topology is as follows:
R1---S0/0--10.1.12.1/24-----------------Frame-relay--------------------10.1.12.2/24--S0/0----R2
R1's Loopback is 1.1.1.1/8
R2's Loopback is 2.2.2.2/8
*Task 1*
Configure Frame-relay Fragmentation between the two routers such that the
largest packet size is 80 Bytes.
*On Both Routers:*
Rx(config)#interface S0/0
Rx(config-if)#Frame-relay fragment 80 end-to-end
*To verify the configuration:*
* *
*On R1*
*R1#Show frame-relay pvc 102*
PVC Statistics for interface Serial1/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:29:43, last time pvc status changed 00:28:34
* fragment type end-to-end fragment size 80*
*Note the output of the above show command reveals that Frame-relay
fragmentation is enabled and the type is set to end-to-end which is FRF.12*
* *
* *
*To test the configuration:*
* *
*On R1*
* *
*R1#Ping 10.1.12.2 size 80 repeat 1*
Type escape sequence to abort.
Sending 1, 80-byte ICMP Echos to 10.1.12.2, timeout is 2 seconds:
*!*
*Success rate is 100 percent (1/1),* round-trip min/avg/max = 64/64/64 ms
*R1#Show frame-relay fragment 102 *
interface dlci frag-type size in-frag out-frag
dropped-frag
Se0/0 102 end-to-end *80 2 2*
0* *
* *
*Note the fragmentation size is set to 80 Bytes, and the size of the ping
packet was 80 Bytes as well, but the output of the above show command
reveals that there were two fragmented packets. This is because the size of
the frame-relay header was NOT considered when the size of the ping packet
was configured. The actual size of the frame-relay header is 2 Bytes, and as
a result of that, the size of the ping packet was 82 Bytes,
therefore, 2 fragmented packets were generated.*
* *
*To test this further:*
* *
*On R1*
*R1#clear counters*
* *
Clear "show interface" counters on all interfaces [confirm]
R1#
*R1#Ping 10.1.12.2 size 78 repeat 1*
Type escape sequence to abort.
Sending 1, 78-byte ICMP Echos to 10.1.12.2, timeout is 2 seconds:
*!*
*Success rate is 100 percent (1/1),* round-trip min/avg/max = 40/40/40 ms
R1#
*R1#Show frame-relay fragment 102*
interface dlci frag-type size in-frag out-frag
dropped-frag
Se0/0 102 end-to-end 80 0 0
0
* *
*Note the above Show command reveals that the ICMP packet was NOT
fragmented; the size of the ICMP packet is 78 Bytes plus the two Bytes of
Frame-relay header equals to 80 Bytes, therefore, it does not need to get
fragmented.*
* *
*To test the configuration further:*
* *
*On R1*
* *
*R1#Ping 10.1.12.2 size 79 repeat 1 *
Type escape sequence to abort.
Sending 1, 79-byte ICMP Echos to 10.1.12.2, timeout is 2 seconds:
*!*
*Success rate is 100 percent (1/1),* round-trip min/avg/max = 60/60/60 ms
*R1#Show frame-relay fragment 102*
* *
interface dlci frag-type size in-frag out-frag
dropped-frag
Se0/0 102 end-to-end 80 2 2
0
R1#* *
i hope this helped.
On Mon, Jan 12, 2009 at 11:21 AM, Pavel Bykov <slidersv@gmail.com> wrote:
> Also look for "Large data packets" and "voice packets are prioritized
> although are waiting behind large packets that take long to send out"
>
> Tyson, correction: Reducing delay, since there is no way to prevent it :)
>
>
> On Mon, Jan 12, 2009 at 7:21 PM, Tyson Scott <tscott@ipexpert.com> wrote:
>
> > Mike,
> >
> > Or if the question talks about preventing serialization delay.
> >
> > Regards,
> >
> > Tyson Scott - CCIE #13513 R&S and Security
> > Technical Instructor - IPexpert, Inc.
> >
> > Telephone: +1.810.326.1444
> > Cell: +1.248.504.7309
> > Fax: +1.810.454.0130
> > Mailto: tscott@ipexpert.com
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Hobbs
> > Sent: Monday, January 12, 2009 11:54 AM
> > To: mike jones
> > Cc: ccielab@groupstudy.com
> > Subject: Re: Frame-relay Fragmentation!
> >
> > Off the top of my head, maybe something like "maximum packet size"...
> >
> > On Mon, Jan 12, 2009 at 9:50 AM, mike jones <ccie1q2008@hotmail.com>
> > wrote:
> >
> > > Group,
> > > What key words in a tasks will lead you to frame-relay
> fragmentation
> > as
> > > the solution?
> > >
> > >
> > >
> > >
> > >
> > > Thanks!
> > >
> > >
> > > Mike
> > >
> > > _________________________________________________________________
> > > Windows Live : Keep your life in sync.
> > >
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> > >
> > >
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> >
> >
> >
>
>
> --
> Pavel Bykov
> ----------------
> Don't forget to help stopping the braindumps, use of which reduces value of
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>
>
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>
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>
-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.MicronicsTraining.com www.Net-Workbooks.com Sr. Technical InstructorBlogs and organic groups at http://www.ccie.net
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