North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: OT? cRTP header compression
Hi Antonio, Agreed with all the info you mention below, I am only talking about RTP vs cRTP usage on diff series, does anyone have info with the CPU uage vs the number of calls/sessions/DS0s sent accross the link that has header compression enabled? All the rest related to QoS, Link Fragmentation, packet size and so on has been covered. Thomas ----- Original Message ----- From: "Pena, Antonio" <[email protected]> To: "'Thomas Kernen'" <[email protected]>; <[email protected]> Sent: Wednesday, April 10, 2002 11:55 PM Subject: RE: OT? cRTP header compression > > Hello Thomas > > I had some kind of experience doing cRTP over Cisco routers, we use Cisco > 7204 & 7206 Routers on the IP Gateways and Cisco's 3600 and 5300 as VoIP > gateways, as well we had a small setup using a Cisco 2611 router on the > termination router. > > The trick is change the VoIP payload size of each packet to reduce the > packets per second in a half improving the performance over the routers, > also we are using as Cisco recommends TCP & RTP headers compression over the > circuits using only MLPPP encapsulation. > > Also please note that using cRTP and Compression you have increased the > switching delay over the circuit and for that reason you may need also to > have more processing power of the router. > > Below you can see a Cisco site where you can check the recommendations for > this setup and also based on that information I created a Bandwidth > calculator on an excel sheet, if you want it, just drop me an email, I will > send it you. > > http://www.cisco.com/warp/public/788/voice-qos/voip-mlppp.html > > http://www.cisco.com/warp/public/788/pkt-voice-general/bwidth_consume.ht ml > > http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/ fqos > _c/fqcprt6/qcfcrtp.htm > > http://www.cisco.com/warp/public/105/compression-qos.html > > > > Bye > > Antonio J. Pena > Manager, Network Engineering > > ( /_ _ _ __/_ _ > |_/(-/ (-_) /(// > Verestar, inc. > 1901 Main street > Santa Monica, CA, 90405 > Phone(310)382-3300 > Direct(310)382-3409 > [email protected] > http://www.verestar.com > > > -----Original Message----- > From: Thomas Kernen [mailto:[email protected]] > Sent: Wednesday, April 10, 2002 1:11 PM > To: [email protected] > Subject: OT? cRTP header compression > > > > > I'm looking for real world experience related to deploying cRTP header > compression on Cisco routers related to VoIP flows. We are trying to > evalute what type of hardware (ie: CPU power since cRTP is CEF switched > since 12.2x IIRC) is required to handle 96/192/384 VoIP calls over a > single circuit (HDLC/PPP/FR). This is related to specific overseas > circuits where the cost of the circuit is still very expensive vs the > cost for the extra hardware to handle the header compression. I'm > disregarding all QoS info at this stage. > > Cheers > Thomas
|