From: Darby Weaver (ccie.weaver@gmail.com)
Date: Tue Jan 13 2009 - 12:20:35 ARST
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
>
>
>
> 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.
> > >
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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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>
>
>
>
>
>
>
>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com
> www.Net-Workbooks.com
> Sr. Technical Instructor
>
>
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>
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