Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm
Still confusing. We know that QoS SRND ues MLP overhead is 13 bytes, but the IPExpert PG always uses 9 bytes. Also, for FRF.12, QoS SRND uses 4 bytes, but the PG uses 6 or 7 bytes, change per lab basic. So what is the right value to use? Thanks, TN. ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm
The right value to use is the one that will get you the points in the lab exam. And as Daniel pointed out yesterday, Ben Ng (the lab author) has clearly stated that he uses the values in the QoS SRND. You do have a certain amount of leeway in the calculations (some unknown percentage factor allowed by the graders). Many of the IPexpert materials use what they consider to be a closer to real-world value. Will that value be within the leeway, and get you the points? That's up to you to decide. Personally - I do wish that the materials were more consistent in the values chosen. As has been stated countless times in the archives - The lab is not a test of best practices or real world scenarios. It's a test to see how well you can interpret and follow the blueprint and the directions that are given. Draw your own conclusions. :) good luck, sd From: ccie_voice-boun...@onlinestudylist.com [mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of Tam Nhu Sent: Wednesday, September 15, 2010 10:31 AM To: ccie_voice@onlinestudylist.com Subject: Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm Still confusing. We know that QoS SRND ues MLP overhead is 13 bytes, but the IPExpert PG always uses 9 bytes. Also, for FRF.12, QoS SRND uses 4 bytes, but the PG uses 6 or 7 bytes, change per lab basic. So what is the right value to use? Thanks, TN. ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm
Great point Steve. The archives of this list is in the top 5 most valuable research resources I'm using for my prep. I feel sometimes that most people do not even bother to look at them. Silly mistake because there are loads of great stuff in there! On Thu, Sep 16, 2010 at 2:42 AM, Steve Denney (stdenney) stden...@cisco.com wrote: The “right” value to use is the one that will get you the points in the lab exam. And as Daniel pointed out yesterday, Ben Ng (the lab author) has clearly stated that he uses the values in the QoS SRND. You do have a certain amount of leeway in the calculations (some unknown percentage factor allowed by the graders). Many of the IPexpert materials use what they consider to be a closer to real-world value. Will that value be within the leeway, and get you the points? That’s up to you to decide. Personally – I do wish that the materials were more consistent in the values chosen. As has been stated countless times in the archives - The lab is not a test of best practices or real world scenarios. It’s a test to see how well you can interpret and follow the blueprint and the directions that are given. Draw your own conclusions. :) good luck, sd *From:* ccie_voice-boun...@onlinestudylist.com [mailto: ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *Tam Nhu *Sent:* Wednesday, September 15, 2010 10:31 AM *To:* ccie_voice@onlinestudylist.com *Subject:* Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm Still confusing. We know that QoS SRND ues MLP overhead is 13 bytes, but the IPExpert PG always uses 9 bytes. Also, for FRF.12, QoS SRND uses 4 bytes, but the PG uses 6 or 7 bytes, change per lab basic. So what is the right value to use? Thanks, TN. ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm
Thanks Steve for great comments. With that in mind, I will start practice with QoS SRND values then - MPL 13 bytes and FRF.12 8 bytes. Thank you all. TN. ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
[OSL | CCIE_Voice] Layer 2 Overhead brainstorm
Hi all, This is obviously an old question has been repeated N times, but varies varies answer anywhere. According to the QoS SRND, page 1-15 stated: * Multilink PPP (MLP) add 13bytes of layer 2 overhead. * Frame Relay adds 4 bytes of Layer 2 overhead; Frame Relay with FRF.12 adds 8 bytes. My first question is, is this MLP included the the FR overhead as well? So MLP (9 bytes) + FR (4 bytes) = 13 bytes According to Cisco web page: VoIP Per Call Bandwidth consumption, 6 bytes is selected for MLP overhead, which one should follow? Per Call Bandwidth Consumptionhttp://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml Second question is, what is the layer 2 overhead for MLP w/ LFI? According to Cisco End-to-End QoS Network Design book,under chapter 16, the MLP listed here is 10 bytes, + 3 for MLP LFI, total would be 13 bytes for MLP LFI. Confuse? Shingei ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 Overhead brainstorm
Not confuse. Ben Ng himself talks about his preference in this link https://supportforums.cisco.com/message/3010632 As he is the one who designs this exam, I think it is safe to follow his suggestions. On Wed, Sep 15, 2010 at 7:08 AM, ShinGei Yong shingei.y...@gmail.comwrote: Hi all, This is obviously an old question has been repeated N times, but varies varies answer anywhere. According to the QoS SRND, page 1-15 stated: * Multilink PPP (MLP) add 13bytes of layer 2 overhead. * Frame Relay adds 4 bytes of Layer 2 overhead; Frame Relay with FRF.12 adds 8 bytes. My first question is, is this MLP included the the FR overhead as well? So MLP (9 bytes) + FR (4 bytes) = 13 bytes According to Cisco web page: VoIP Per Call Bandwidth consumption, 6 bytes is selected for MLP overhead, which one should follow? Per Call Bandwidth Consumptionhttp://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml Second question is, what is the layer 2 overhead for MLP w/ LFI? According to Cisco End-to-End QoS Network Design book,under chapter 16, the MLP listed here is 10 bytes, + 3 for MLP LFI, total would be 13 bytes for MLP LFI. Confuse? Shingei ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
[OSL | CCIE_Voice] Layer 2 Overhead Size on Frame Relay
This question keeps cropping up so I thought I'd share my findings on this: QoS SRND MLP - 13 bytes FR - 4 bytes FRF.12 - 8 bytes UC SRND MLP - 10 bytes FR - 4 bytes FRF.12 - can't find it. Looking at the standards RFC 1990 for MLP Long Sequence Number Format 10 bytes Short Sequence Number Format 8 bytes So together with the UC SRND I assume Cisco use the Long Sequence Number Format and would use the 10 bytes figure FRF.12 Seems to have options for example on Cisco the End-to-End Fragmentation and Switched PVC Fragmentation formats are different: However in Cisco Press - Cisco Frame Relay Solutions Guide - I find (Figure 16.3) 2 bytes FR Header 2 bytes UI and NLPID ( Network Layer Protocol Identifier) 2 bytes Fragmentation Header 2 bytes FCS Total 8 bytes which matches the QoS SRND Normal FR is a 2 byte header and 2 byte FCS giving 4 bytes as in both SRNDs So summary - MPLP = 10 bytes, FRF.12= 8 bytes FR = 4 bytes Any other options welcome. Regards Graham Hopkins ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 Overhead Size on Frame Relay
Graham - IPexpert has several quality explanations for the size in bytes of each of these layer two methods. However, when approaching the QoS section of the CCIE Voice lab, I personally have opted to only use the QoS SRND. During last years, Ask the Expert forum, Ben Ng stated that he always uses the QoS SRND. Since he writes the labs for the voice track, I've decided to use the same standard he does. However, I believe it's been said that the proctors allow for a certain variance between the stated solution and what the candidate enters in his configuration. *Matthew Berry* *_Vitals:_* *GVoice: *+1.612.424.5044 *Gmail*: ciscovoiceg...@gmail.com *Skype*: ciscovoiceguru *Twitter*: ciscovoiceguru On 7/6/2010 3:25 AM, Graham Hopkins wrote: This question keeps cropping up so I thought I'd share my findings on this: QoS SRNDham - MLP - 13 bytes FR - 4 bytes FRF.12 - 8 bytes UC SRND MLP - 10 bytes FR - 4 bytes FRF.12 - can't find it. Looking at the standards RFC 1990 for MLP Long Sequence Number Format 10 bytes Short Sequence Number Format 8 bytes So together with the UC SRND I assume Cisco use the Long Sequence Number Format and would use the 10 bytes figure FRF.12 Seems to have options for example on Cisco the End-to-End Fragmentation and Switched PVC Fragmentation formats are different: However in Cisco Press - Cisco Frame Relay Solutions Guide - I find (Figure 16.3) 2 bytes FR Header 2 bytes UI and NLPID ( Network Layer Protocol Identifier) 2 bytes Fragmentation Header 2 bytes FCS Total 8 bytes which matches the QoS SRND Normal FR is a 2 byte header and 2 byte FCS giving 4 bytes as in both SRNDs So summary - MPLP = 10 bytes, FRF.12= 8 bytes FR = 4 bytes Any other options welcome. Regards Graham Hopkins ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
Re: [OSL | CCIE_Voice] Layer 2 overhead
FR = 4 bytes FRF.12 = 8 bytes Agreed. For MLPoFR (w/ or w/out LFI - but in our case we would only be using MLP for LFI) I've been using 4B (FR) + 13B (MLP). Also, in all the IPExpert solution guides for Volume 3 atleast they've been using 4B+13B for MLPoFR On Wed, Jan 14, 2009 at 1:50 PM, Ryan Trauernicht ryanstudyvo...@gmail.comwrote: Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
Ok good.. FRF.12 w/ FR = 8 FR = 4 FRF.12 = 4 sorry for the confusion. On Wed, Jan 14, 2009 at 1:58 PM, wafers44 wafer...@gmail.com wrote: FR = 4 bytes FRF.12 = 8 bytes Agreed. For MLPoFR (w/ or w/out LFI - but in our case we would only be using MLP for LFI) I've been using 4B (FR) + 13B (MLP). Also, in all the IPExpert solution guides for Volume 3 atleast they've been using 4B+13B for MLPoFR On Wed, Jan 14, 2009 at 1:50 PM, Ryan Trauernicht ryanstudyvo...@gmail.com wrote: Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
So Vik when it says don't use FRF.12 , that is we got to use MLP LFI in that case how much the payload be 20+4+13 =17 or 20+13 = 33 Kindly let us know... --- On Thu, 1/15/09, Vik Malhi vma...@ipexpert.com wrote: From: Vik Malhi vma...@ipexpert.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Date: Thursday, January 15, 2009, 1:42 AM MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi – CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
sorry need to add RTP/UDP/Header 40 too to these vlaues..so shall it be MLP with LFI = 20+40+4+13 =77 or 20+40-+13 =73 --- On Thu, 1/15/09, anil batra anil...@yahoo.com wrote: From: anil batra anil...@yahoo.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com, Vik Malhi vma...@ipexpert.com Date: Thursday, January 15, 2009, 1:52 AM So Vik when it says don't use FRF.12 , that is we got to use MLP LFI in that case how much the payload be 20+4+13 =17 or 20+13 = 33 Kindly let us know... --- On Thu, 1/15/09, Vik Malhi vma...@ipexpert.com wrote: From: Vik Malhi vma...@ipexpert.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Date: Thursday, January 15, 2009, 1:42 AM MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi – CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
It is 17 for sure. Regards, Shadab CCIE# 22893 (Voice) Technology Solutions Network ~Sent from my NOKIA E61i~ -Original Message- From: anil batra [mailto:anil...@yahoo.com] Sent: Thursday, January 15, 2009 04:23 AM China Standard Time To: Ryan Trauernicht; ccie_voice@onlinestudylist.com; Vik Malhi Subject:Re: [OSL | CCIE_Voice] Layer 2 overhead So Vik when it says don't use FRF.12 , that is we got to use MLP LFI in that case how much the payload be 20+4+13 =17 or 20+13 = 33 Kindly let us know... --- On Thu, 1/15/09, Vik Malhi vma...@ipexpert.com wrote: From: Vik Malhi vma...@ipexpert.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Date: Thursday, January 15, 2009, 1:42 AM MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi - CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
And yes, its 77 w/o compression 39 with compression Regards, Shadab CCIE# 22893 (Voice) Technology Solutions Network ~Sent from my NOKIA E61i~ -Original Message- From: anil batra [mailto:anil...@yahoo.com] Sent: Thursday, January 15, 2009 04:26 AM China Standard Time To: Ryan Trauernicht; ccie_voice@onlinestudylist.com; Vik Malhi Subject:Re: [OSL | CCIE_Voice] Layer 2 overhead sorry need to add RTP/UDP/Header 40 too to these vlaues..so shall it be MLP with LFI = 20+40+4+13 =77 or 20+40-+13 =73 --- On Thu, 1/15/09, anil batra anil...@yahoo.com wrote: From: anil batra anil...@yahoo.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com, Vik Malhi vma...@ipexpert.com Date: Thursday, January 15, 2009, 1:52 AM So Vik when it says don't use FRF.12 , that is we got to use MLP LFI in that case how much the payload be 20+4+13 =17 or 20+13 = 33 Kindly let us know... --- On Thu, 1/15/09, Vik Malhi vma...@ipexpert.com wrote: From: Vik Malhi vma...@ipexpert.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Date: Thursday, January 15, 2009, 1:42 AM MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi - CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
Vik any reason why the IPExperts lab do 13+4 for MLPoFR? On Wed, Jan 14, 2009 at 2:35 PM, Shadab Abbasi (moabbasi) moabb...@cisco.com wrote: And yes, its 77 w/o compression 39 with compression Regards, Shadab CCIE# 22893 (Voice) Technology Solutions Network ~Sent from my NOKIA E61i~ -Original Message- From: anil batra [mailto:anil...@yahoo.com anil...@yahoo.com] Sent: Thursday, January 15, 2009 04:26 AM China Standard Time To: Ryan Trauernicht; ccie_voice@onlinestudylist.com; Vik Malhi Subject:Re: [OSL | CCIE_Voice] Layer 2 overhead sorry need to add RTP/UDP/Header 40 too to these vlaues..so shall it be MLP with LFI = 20+40+4+13 =77 or 20+40-+13 =73 --- On Thu, 1/15/09, anil batra anil...@yahoo.com wrote: From: anil batra anil...@yahoo.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com, Vik Malhi vma...@ipexpert.com Date: Thursday, January 15, 2009, 1:52 AM So Vik when it says don't use FRF.12 , that is we got to use MLP LFI in that case how much the payload be 20+4+13 =17 or 20+13 = 33 Kindly let us know... --- On Thu, 1/15/09, Vik Malhi vma...@ipexpert.com wrote: From: Vik Malhi vma...@ipexpert.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Ryan Trauernicht ryanstudyvo...@gmail.com, ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Date: Thursday, January 15, 2009, 1:42 AM MLPoFR is actually either 10 or 11 bytes (my memory is failing me). In the SRND it states MLP is 13 bytes. The 13 bytes I can only imagine is a conservative estimate or is MLPoATM. It certainly is very conservative for MLPoFR. I would clarify with the proctor- I would not use 13 + 4 = 17 bytes. Page 33 of the QoS SRND talks about these values and I would treat the 13 bytes listed for MLP as being appropriate for MLPoFR. -- Vik Malhi – CCIE #13890, CCSI #31584 Senior Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Mailto: vma...@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 RS Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. From: Ryan Trauernicht ryanstudyvo...@gmail.com Date: Wed, 14 Jan 2009 13:50:10 -0600 To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] Layer 2 overhead Reading the SRND and a few other books on the WAN QOS... looks like FR layer 2 is not included in the page 33 statements. Vik can you confirm these are correct for layer 2 byte sizes. MLP in the SRST states it is 13 bytes for layer 2. That actually includes LFI MLP without LFI FR = 10 bytes MLP with LFI and without FR = 13 bytes MLP with LFI FR = 17 bytes FR = 4 bytes FRF.12 = 8 bytes anyone agree or disagree? Thanks, Ryan Trauernicht
Re: [OSL | CCIE_Voice] Layer 2 overhead
This is getting confusing. I read in IEexpert (or Internetwork Expert, I forgot) that for MLPoFR(g729), without compression: 27.6 with compression: 12.4 Let me see if I can still access that article... Message: 2 Date: Wed, 14 Jan 2009 15:09:01 -0600 From: Ryan Trauernicht ryanstudyvo...@gmail.com Subject: Re: [OSL | CCIE_Voice] Layer 2 overhead To: Shadab Abbasi (moabbasi) moabb...@cisco.com Cc: ccie_voice@onlinestudylist.com, Vik Malhi vma...@ipexpert.com, anil...@yahoo.com Message-ID: 8198026e0901141309v7fdc242fvaa686123dd7a4...@mail.gmail.com Content-Type: text/plain; charset=windows-1252 Vik any reason why the IPExperts lab do 13+4 for MLPoFR? On Wed, Jan 14, 2009 at 2:35 PM, Shadab Abbasi (moabbasi) moabb...@cisco.com wrote: And yes, its 77 w/o compression 39 with compression Regards, Shadab CCIE# 22893 (Voice) Technology Solutions Network ~Sent from my NOKIA E61i~ -Original Message- From: anil batra [mailto:anil...@yahoo.com anil...@yahoo.com] Sent: Thursday, January 15, 2009 04:26 AM China Standard Time To: Ryan Trauernicht; ccie_voice@onlinestudylist.com; Vik Malhi Subject:Re: [OSL | CCIE_Voice] Layer 2 overhead sorry need to add RTP/UDP/Header 40 too to these vlaues..so shall it be MLP with LFI = 20+40+4+13 =77 or 20+40-+13 =73
[OSL | CCIE_Voice] Layer 2 overhead for frame relay
Hello, Can any one confirm the following for T1/ frame relay overhead values: Cisco Frame: 7 bytes IETF frame: 7 bytes PPP over Frame: 9 bytes FRF12: 8 bytes HDLC: 7 bytes I have read that FRF12 and frame relay should have the same overhead, but I have seen 7 bytes listed for frame overhead and 8 listed for FRF12 from various sources. Thanks Chris Parker
