Definitely, Im sorry I didnt understand at first J
Happy studies! Jeff From: Roig Borrell, Francesc Xavier [mailto:francesc.ro...@tecnocom.es] Sent: Wednesday, January 05, 2011 12:12 PM To: givemeccievoice2...@gmail.com; 'Shrini' Cc: ccie_voice@onlinestudylist.com Subject: RE: [OSL | CCIE_Voice] RSVP LLQ priority value calculation Hi Jeff, Great! Then we agree with the solution for this requirement. J Thank you very much!! De: givemeccievoice2...@gmail.com [mailto:givemeccievoice2...@gmail.com] Enviado el: miércoles, 05 de enero de 2011 20:53 Para: Roig Borrell, Francesc Xavier; 'Shrini' CC: ccie_voice@onlinestudylist.com Asunto: RE: [OSL | CCIE_Voice] RSVP LLQ priority value calculation Hi Francesc, As I noted before, the RSVP bandwidth calculation is different from the LLQ bandwidth calculation. For the scenario of 2 RSVP calls, you will need to calculate as follows: 40 + 24 = 64 (one worst case 10ms call and one normal 20 ms) So under the serial interfaces you will configure ip rsvp bandwidth 64 The question states that you need to put the RSVP traffic in the PQ. This means that the traffic will have to be marked as EF to make it into the LLQ. Under the same serial interface, enter the ip rsvp signaling ef command Now you need to calculate your BW for the LLQ. IP/UDP/RTP - 40 Payload 20 FRF.12 8 40 + 20 + 8 = 68 68 bytes * 8 bits = 544 bits per packet 544 bpp * 50 pps = 272000 bps or 27.2 Kbps 2 G729 calls * 27.2 Kbps = 54.4 Kbps or roughly 55 Kbps A basic LLQ without RSVP overhead would need to have a priority 55 command. However, the question asks for you to take this extra overhead for RSVP into account. IP/UDP/RTP - 40 Payload 10 FRF.12 8 40 + 10 + 8 = 58 bytes 58 * 8 = 464 bpp 464 * 100 pps = 46400 bps or 46.4 Kbps Therefore the bandwidth calculation would instead be 27.2 + 46.4 = 73.6 Kbps or 74 Kbps. Hope this helps, Jeff From: ccie_voice-boun...@onlinestudylist.com [mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of Roig Borrell, Francesc Xavier Sent: Wednesday, January 05, 2011 10:10 AM To: Shrini Cc: ccie_voice@onlinestudylist.com Subject: Re: [OSL | CCIE_Voice] RSVP LLQ priority value calculation Hi Shrini, Thank you for your answer. I dont see very clear how you take into consideration L2 header These values 40kbps (g729 10ms)/ 24kbps (g729 20ms) only consider L3+UDP/RTP+Payload. For 2 g729 calls ip rsvp bandwith= 24+40 =64 OK But which value would you use for priority queue if you have this question Between HQ-BR1 provision enough bandwidth in the priority queue for 2 calls. Any RSVP traffic should be placed into the PQ. Ensure that you provision additional amount of bandwidth in the PQ to include RSVP traffic Thanks!! Francesc Lets take example of one g729 call rsvp a= Worst case = (L3+PL)*8*100 = (40+10)*8*100 = 40k b= One G729 = ((L2+L3)+PL)*50*8 = ((40)+20)*8*50 = 24 ---- {{{{L2+L3 = IP+RTP+UDP = 40 De: Shrini [mailto:linuxbos...@gmail.com] Enviado el: miércoles, 05 de enero de 2011 18:33 Para: Roig Borrell, Francesc Xavier CC: ccie_voice@onlinestudylist.com Asunto: Re: [OSL | CCIE_Voice] RSVP LLQ priority value calculation Hi Roig, Each call in Location based CAC : g729 - 24k g711 - 80k RSVP: g729 - 40k g711 - 96k Gatekeeper: g729 - 16k g711 - 128k (not sure 100%) For your question Lets take example of one g729 call rsvp a= Worst case = (L3+PL)*8*100 = (40+10)*8*100 = 40k b= One G729 = ((L2+L3)+PL)*50*8 = ((40)+20)*8*50 = 24 ---- {{{{L2+L3 = IP+RTP+UDP = 40 So one call need 64k but 40 is hardcoded for rsvp. Thanks Shrini On 1/5/2011 7:42 AM, Roig Borrell, Francesc Xavier wrote: Hi everyone! I am trying to understand the right way to calculate the priority value in LLQ with a RSVP configuration. I have not been able to find documentation clarifying this. So supposing HQ-BR1 4 calls g729 ip rsvp bandwitdh = 24*3 + 40 = 112 No problem with the rsvp bandwith, 3 calls with 20ms sample rate and one call with the worst case 10ms sample rate. So following this and considering FR12 . The priority queue should be calculated this way L2 7 L2 7 L3 40 L3 40 Payload 20 Payload 10 67*8*50= 26,8kbps 57*8*100 = 45,6kbps LLQ priority = 28,6*3 + 45,6 = 131,4 ->132 Do you agree? Is it the right way? Thanks in advance! Francesc _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
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