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Getting Quality of Service from AARNet3 for: OzEconference Tuesday 29 th November 2005 - VoIP, and - Video Conferencing
© 2005, AARNet Pty Ltd 2 Update/introduction on AARNet3
© 2005, AARNet Pty Ltd 3 QoS 1.Quality of Service is a feature of advanced networks. It ensures that particular traffic does not congest. 2.Traffic is “identified” to get QoS in special area in each packet (was called IP Precedence, or ToS) and is now called Differential Services Code Points (DSCP). 3.DSCP = 46 is for VoIP (was ToS=5) 4.DSCP= 34 is for Video (was ToS=4)
© 2005, AARNet Pty Ltd 4 QoS in AARNet3 1.AARNet network will give priority to VoIP and Video only if it is marked correctly! 2.What traffic gets QoS, and what does not, is controlled by the Member! 3.AARNet3 uses the new DSCP, not the older ToS or IP Precedence. Any traffic leaving a Member into AARNet3 with Tos=4 (Video) will be changed by AARNet into DSCP=34, and Tos=5 (VoIP) will be changed to DSCP=46. 4.The following safe gaurds are proposed to prevent any one Member from causing QoS to fail (eg from a DOS Attack).(see next slide)
© 2005, AARNet Pty Ltd 5 QoS policing into AARNet3 1.The following safe gaurds are proposed to prevent any one Member from causing QoS to fail (eg from a DOS Attack).(see next slide) 2.VoIP and VIDEO traffic must be policed by the Member, only Members with controls in place will get QoS. 3.In general each connection will get 2Mbps for admission controlled VoIP, and 30Mbps for admission controlled Video. These values can be changed depending on needs of the Member. 4.If a Member exceeds the peak then AARNet routers will mark the excess with no QoS.
© 2005, AARNet Pty Ltd 6 Options for Member with VoIP Gateway 1.Tell the VoIP Gateway to use DSCP 46 rather than IP Precedence=5. 2.Configure the edge router that only the VoIP Gateway can use DSCP=46, any other traffic using DSCP=46 should have it over written with DSCP=0.
© 2005, AARNet Pty Ltd 7 Options for Member with IP Telephones 1.Tell the IP Telephones to use DSCP 46 rather than IP Precedence=5. 2.Configure the network so that only the VLAN with IP Telephones can use DSCP=46, any other traffic using DSCP=46 should have it over written with DSCP=0.
© 2005, AARNet Pty Ltd 8 Options for Member with Video Configure the devices to use DSCP=34. There are then two options: 1.Use VLANS and or Access Lists to identify what devices can use DSCP=34. Everyone else using DSCP=34 should have their DSCP changed to 0. 2.Use a Gatekeeper in full RTP Proxy mode, such as the GNU Gatekeeper. This can also solve your Firewall and NAT issues as well as improve connecting calls! Send all Video traffic via the GNU Gatekeeper and tell the network to allow the GNU GK to use DSCP=34. This is probably the best solution.
© 2005, AARNet Pty Ltd 9 Project Phases 1.Dec 05 / Jan 06: Checking of the detailed configuration 2.Pilot the QoS with a volunteer Member(s) on a particular link(s). 3.Monitor and evaluate. 4.Implement in a controlled way, Member by Member, remembering that the Member also has to be prepared.
© 2005, AARNet Pty Ltd 10 Questions 1.The Video Working Group is starting up a project to help Members with deploying GNU Gatekeeper. 2.Use the IPTEL Working Group to get help on VoIP related issues. 3.Gerneral VIDEO and VoIP help can be obtained by contact 4.Specific QoS design issues could be directed to Glen Turner 5.Any Network Operational issues, or Network related deployment issues could be directed to the AARNet NOC.
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