Re: [OSL | CCIE_Voice] 3750 egress priority queue
Yes the Software configuration does indeed say that. But A while back I ran into a problem that indicated otherwise. I guess I just need to run a test case in the lab to verify it. So for test questions go with what the book says. Brian On 6/29/2011 8:12 PM, adam compton wrote: Not according to the 3750 QOS example guide. It says if you have Priority-queue out on an interface, SRR is ignored for the priority queue, and it is serviced until empty. On Wed, Jun 29, 2011 at 8:05 PM, Brian Mahler brianmahle...@gmail.com mailto:brianmahle...@gmail.com wrote: My understanding is the the SRR Shaped command still applies to the queue even though Priority Queue out is applied to the interface. It prevents the Priority queue from starving out the other queues (that are shared). Acts similiar to the Policy-map Priority command on the routers. The SRR shaped command set a minimum bandwidth guarantee on the remain queues. Also similar to the Policy-map Bandwidth command on the router. Brian On 6/29/2011 3:43 PM, adam compton wrote: I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visitwww.ipexpert.com http://www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com http://www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
Hey Adam, As promised, here is the test you can do for the priority-queue out. (Double check me on this, since I don't come from a RS background) On my HQ Switch, I enabled auto qos on all the phone ports (trust phone) On the uplink port to HQ-RTR (for me is fas0/23) I set srr-queue bandwidth shape 65500 0 0 0 - which will make the effective bandwidth for queue 1 to about 2 b/s Make sure only cos 5 and dscp 46 is mapped to q1 thres 3, and all others are mapped somewhere else. At this point, we will test 2 scenarios on the uplink port. 1. With the priority-queue out command 2. Without the priority-queue out command But before we continue… Need to find your asic port number for the uplink port. Use the this command show platform pm if-numbers Then to see how many drops on that port, use this command. show platform port-asic stats drop port 25 -my fas0/23 = 25 (these commands are in the Cisco Catalyst 3750 QoS Configuration Examples at the very bottom) http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml So on with the test... 1. With the priority-queue out cammand scenario Issue the priority-queue out command on the uplink port. Make calls from Hq1 to BR1 and Hq2 to BR2. Then run the show platform port-asic stat drop port # command again. Port 25 TxQueue Drop Statistics Queue 0 - this is queue 1 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 - no drops Queue 1 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 2 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 3 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 On the BR1 phones, press ? ? to see send / receive packets. they increment at the same rate. 2. Without the priority-queue out scenario remove the priority-queue out command Make calls again from 2 Hq phones to 2 BR1 phones. Then run the show platform port-asic command again. Port 25 TxQueue Drop Statistics Queue 0 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 3960 = voice packets dropping Queue 1 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 2 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 3 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Supervisor TxQueue Drop Statistics On the BR1 phones, press ? ? again. You will see the RCVR packets either coming in really slow or none at all. Conclusion: Priority-queue out command will ignore what is configured on the shape for queue 1, and service that queue until empty, as doc says. The question then is: What is a priority queue? Not priority-queue or a strict priority queue. the documentation does not mention priority queue for 3750 outside of enabling the priority queue out. In older switches the p-q was able to be rate limited. Wonder if the lab designers are using that assumption. Again check my sanity on this test. Thanks Sam ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
Three different configurations are available for the switch interface. The configurations are bandwidth shape, share, and limit. You can also configure egress queue 1 as the priority queue. If the priority queue is enabled, SRR services it until it is empty before servicing the other three queues. However, in ingress priority queue, SRR services the priority queue with the configured value. From: ccie_voice-boun...@onlinestudylist.com [mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of Brian Mahler Sent: Thursday, June 30, 2011 12:34 AM To: adam compton Cc: ccie_voice@onlinestudylist.com Subject: Re: [OSL | CCIE_Voice] 3750 egress priority queue Yes the Software configuration does indeed say that. But A while back I ran into a problem that indicated otherwise. I guess I just need to run a test case in the lab to verify it. So for test questions go with what the book says. Brian On 6/29/2011 8:12 PM, adam compton wrote: Not according to the 3750 QOS example guide. It says if you have Priority-queue out on an interface, SRR is ignored for the priority queue, and it is serviced until empty. On Wed, Jun 29, 2011 at 8:05 PM, Brian Mahler brianmahle...@gmail.commailto:brianmahle...@gmail.com wrote: My understanding is the the SRR Shaped command still applies to the queue even though Priority Queue out is applied to the interface. It prevents the Priority queue from starving out the other queues (that are shared). Acts similiar to the Policy-map Priority command on the routers. The SRR shaped command set a minimum bandwidth guarantee on the remain queues. Also similar to the Policy-map Bandwidth command on the router. Brian On 6/29/2011 3:43 PM, adam compton wrote: I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.comhttp://www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.comhttp://www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.comhttp://www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.comhttp://www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
[OSL | CCIE_Voice] 3750 egress priority queue
I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
Adam, I have had the same exact question. As far as I know, you could only assign bandwidth to inbound priority queue. If someone sheds a light on this, it would be appreciated. Thank, Emin From: ccie_voice-boun...@onlinestudylist.com [mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of adam compton Sent: Wednesday, June 29, 2011 5:43 PM To: ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] 3750 egress priority queue I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
My understanding is the the SRR Shaped command still applies to the queue even though Priority Queue out is applied to the interface. It prevents the Priority queue from starving out the other queues (that are shared). Acts similiar to the Policy-map Priority command on the routers. The SRR shaped command set a minimum bandwidth guarantee on the remain queues. Also similar to the Policy-map Bandwidth command on the router. Brian On 6/29/2011 3:43 PM, adam compton wrote: I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
The MQC commands (class-maps, policy-maps, etc) can only be applied on ingress with switches. Although, you can also rate limit in the egress direction as well, just not using the MQC . To rate limit in the egress direction you can use the following commands: Lets say you had a 1Gb/s link on interface gig 0/1 config-if# srr-queue bandwidth limit 10 config-if# srr-queue bandwidth shape 25 0 0 0 config-if# srr-queue bandwidth share 30 20 25 25 config-if# no priority-queue out 1) the bandwidth limit statement limits the available bandwidth to 10% of the link speed (in this case 10% of 1Gb/s is 100 Mb/s). 2) the srr-queue bandwidth shape 25 0 0 0 statements set a maximum of 1/25 (or 4%) of the available bandwidth which results in 4% of 100Mb/s or 4Mb/s maximum bandwidth for queue 1. 3) the srr-queue bandwidth Shared 30 20 25 25 statement sets a minimum bandwidth guarentee for queues 2 at 28%, Q3 at 35% and Q4 also at 35% of the available bandwidth.The % are calculated as follows Q2 = 20/20+25+25 Q3Q4 = 25/20+25+25 This will result in a maximum of 4Mb/s on Q1, a minimum of 28Mb/s on Q2, and a minimum of 35Mb/s on Q3 and Q4. Brian On 6/29/2011 5:25 PM, Emin Guliyev wrote: Adam, I have had the same exact question. As far as I know, you could only assign bandwidth to inbound priority queue. If someone sheds a light on this, it would be appreciated. Thank, Emin *From:*ccie_voice-boun...@onlinestudylist.com [mailto:ccie_voice-boun...@onlinestudylist.com] *On Behalf Of *adam compton *Sent:* Wednesday, June 29, 2011 5:43 PM *To:* ccie_voice@onlinestudylist.com *Subject:* [OSL | CCIE_Voice] 3750 egress priority queue I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
Not according to the 3750 QOS example guide. It says if you have Priority-queue out on an interface, SRR is ignored for the priority queue, and it is serviced until empty. On Wed, Jun 29, 2011 at 8:05 PM, Brian Mahler brianmahle...@gmail.comwrote: ** My understanding is the the SRR Shaped command still applies to the queue even though Priority Queue out is applied to the interface. It prevents the Priority queue from starving out the other queues (that are shared). Acts similiar to the Policy-map Priority command on the routers. The SRR shaped command set a minimum bandwidth guarantee on the remain queues. Also similar to the Policy-map Bandwidth command on the router. Brian On 6/29/2011 3:43 PM, adam compton wrote: I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
Re: [OSL | CCIE_Voice] 3750 egress priority queue
Adam, It sounds conflicting, but you have to understand what it's asking, it most like doesn't mean to use priority queue out. You have to make sure it's asking for priority queue out. From: ccie_voice-requ...@onlinestudylist.com Subject: CCIE_Voice Digest, Vol 64, Issue 232 To: ccie_voice@onlinestudylist.com Date: Wed, 29 Jun 2011 19:56:28 -0400 Send CCIE_Voice mailing list submissions to ccie_voice@onlinestudylist.com To subscribe or unsubscribe via the World Wide Web, visit http://onlinestudylist.com/mailman/listinfo/ccie_voice or, via email, send a message with subject or body 'help' to ccie_voice-requ...@onlinestudylist.com You can reach the person managing the list at ccie_voice-ow...@onlinestudylist.com When replying, please edit your Subject line so it is more specific than Re: Contents of CCIE_Voice digest... Today's Topics: 1. 3750 egress priority queue (adam compton) 2. Re: Passed (Brian Mulgrew) 3. Re: Passed (Moataz Mamdouh) 4. What switches are there in the CCIE Voice lab? 3560 or 3550? (Divin Mathew John) 5. Re: 3750 egress priority queue (Emin Guliyev) 6. Re: MLS QoS issue (Brian Mahler) -- Message: 1 Date: Wed, 29 Jun 2011 17:43:12 -0400 From: adam compton com...@gmail.com To: ccie_voice@onlinestudylist.com ccie_voice@onlinestudylist.com Subject: [OSL | CCIE_Voice] 3750 egress priority queue Message-ID: banlktinqzhrmusb5b9qcrf9gfudf_w0...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 I've had practice questions that state to guarantee traffic for the priority queue, but it also says shape queue 1 to 30%. As I would normally understand it, to enable the priority queue you need the following command on a port: priority-queue out If you use this command SRR shaping and sharing is ignored for the priority-queue. priority-queue with that command is serviced until empty, so no srr involved at all. So how can I guarantee traffic for the priority queue while also shaping queue 1 to 30%. Seems like conflicting statements... Adam Compton -- next part -- An HTML attachment was scrubbed... URL: /archives/ccie_voice/attachments/20110629/cad75bd4/attachment-0001.html -- Message: 2 Date: Wed, 29 Jun 2011 22:50:27 +0100 From: Brian Mulgrew btmulg...@gmail.com To: George Goglidze gogli...@gmail.com Cc: CCIE Voice online groupstudy ccie_voice@onlinestudylist.com Subject: Re: [OSL | CCIE_Voice] Passed Message-ID: BANLkTim=dndWSWAF5=1g6eftqawawuj...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 Well done George and thanks for all your help! On Wed, Jun 29, 2011 at 2:44 PM, George Goglidze gogli...@gmail.com wrote: Hi all, As the subject suggests, it's official, I'm dual CCIE #19926 RS and Voice starting yesterday. Finally, it's a relief, no more studying late, spending weekends on a computer, making calls, my neighbours think I escaped a psychiatric, after hearing voices at night TEST VOICEMAIL FOR HQ PHONE 1 and my personal favourite YOUR POSITION IN QUEUE IS :) I would like to transmit a very special thank you to IPExpert, and especially Vik Malhi. He's definitely made difference for me as a trainer. Just when you think you know it all about something, he would come up with something to prove me wrong, to show me the gaps in my knowledge I didn't know existed. Thank you Vik! Thanks to everyone on this forum too, there are many good people on the forum, with big knowledge, and more importantly willing to share it. It was big fun, I enjoyed the process a lot. By the way, I made it technically on my first attempt. Well, I payed once only, although I went to exam 3 times. 1st time, technical problems, Cisco gave me free retake voucher, 2nd time, again technical problems, again free voucher. To be honest after so many free retakes, I'm not even sure if I really passed, or I was costing them too much so they decided to give it to me :-), good samaritans these cisco guys. Wish you all good luck, and don't get frustrated, and most importantly have fun. Regards, ___ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com -- next part -- An HTML attachment was scrubbed... URL: /archives/ccie_voice/attachments/20110629/62001f49/attachment-0001.html -- Message: 3 Date: Wed, 29 Jun 2011 21:10:17 + From: Moataz Mamdouh moataz_m...@yahoo.com To: George Goglidze gogli...@gmail.com, ccie_voice-boun...@onlinestudylist.com, CCIE Voice online groupstudy ccie_voice@onlinestudylist.com Subject: Re: [OSL | CCIE_Voice] Passed Message-ID: 1169904903-1309385413
