Re: Frame-relay Fragmentation!

From: Narbik Kocharians (narbikk@gmail.com)
Date: Tue Jan 13 2009 - 19:44:47 ARST

hahahaha

I should have said 72.4 percent passing on thier first attempt. I guess its
like the 500 pages of QOS.

On Tue, Jan 13, 2009 at 6:20 AM, Darby Weaver <ccie.weaver@gmail.com> wrote:

> Actually,
>
> If you really wanna know how the "words" might look you got a few options:
>
> 1. Check CCO for the Tech Tips where the issues affected someone and how
> Cisco had to deal with it -
> http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801142de.shtml
>
> 2. The CCIE Accessor.
>
> 3. Cisco Press CCIE Lab Books and Practical Studies Books.
>
> 4. Cisco Press - Frame Relay
>
> Maybe it's time to post the list of books you can use in lieu of a class
> for those on a tight budget or who don't have corporate funding.
>
>
> Verify on both sides of the link:
>
> R5#sh frame-relay fragment interface s1/0 501
>
> fragment size 200 fragment type end-to-end
> in fragmented pkts 4511 out fragmented pkts 86
> in fragmented bytes 109183 out fragmented bytes 10797
> in un-fragmented pkts 162 out un-fragmented pkts 88
> in un-fragmented bytes 10808 out un-fragmented bytes 5952
> in assembled pkts 1053 out pre-fragmented pkts 130
> in assembled bytes 94707 out pre-fragmented bytes 16317
> in dropped reassembling pkts 0 out dropped fragmenting pkts
> 0
> in DE fragmented pkts 4511 out DE fragmented pkts 0
> in DE un-fragmented pkts 162 out DE un-fragmented pkts 0
> in timeouts 0
> in out-of-sequence fragments 0
> in fragments with unexpected B bit set 0
> in fragments with skipped sequence number 0
> out interleaved packets 0
> R5#sh frame-relay fragment
> interface dlci frag-type size in-frag out-frag dropped-frag
> Se1/0 501 end-to-end 200 4519 86 0
>
>
>
>
>
> On 1/12/09, Tyson Scott <tscott@ipexpert.com> wrote:
>
>> Narbik,
>>
>>
>>
>> It is definitely great to know what frame-relay fragmentation does and to
>> see how it affects traffic sent thru it. I think that your example is
>> great
>> for that. But the question is to know when it is necessary. Most tasks
>> are
>> not specifically going to tell a student to do fragmentation but the
>> student
>> needs to understand based on the requirements of the question that they
>> need
>> to do it.
>>
>>
>>
>> But really that was a great example of configuring it Narbik.
>>
>>
>>
>> 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
>>
>>
>>
>> Join our free online support and peer group communities:
>> http://www.IPexpert.com/communities <http://www.ipexpert.com/communities>
>>
>>
>>
>> IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On
>> Demand
>> and Audio Certification Training Tools for the Cisco CCIE R&S Lab, CCIE
>> Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage
>> Lab Certifications.
>>
>>
>>
>>
>> From: Narbik Kocharians [mailto:narbikk@gmail.com]
>> Sent: Monday, January 12, 2009 3:34 PM
>> To: Pavel Bykov
>> Cc: Tyson Scott; Hobbs; mike jones; ccielab@groupstudy.com
>> Subject: Re: Frame-relay Fragmentation!
>>
>>
>>
>> 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.
>> > >
>> http://windowslive.com/explore?ocid=TXT_TAGLM_WL_t1_allup_explore_012009
>> > >
>> > >
>> > > Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
>>
>> > >
>> > >
>> _______________________________________________________________________
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>> >
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>> --
>> Pavel Bykov
>> ----------------
>> Don't forget to help stopping the braindumps, use of which reduces value
>> of
>> your certifications. Sign the petition at http://www.stopbraindumps.com/
>>
>>
>>
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>>
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>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>> Narbik Kocharians
>> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
>> www.MicronicsTraining.com <http://www.micronicstraining.com/>
>> www.Net-Workbooks.com <http://www.net-workbooks.com/>
>> Sr. Technical Instructor
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
> 

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
www.Net-Workbooks.com
Sr. Technical Instructor

Blogs and organic groups at http://www.ccie.net

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