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GPN QoS Implementation. Dave Hartzell, Raytheon, Greatplains Network, And the USGS. Need for QoS. GPN (at the time) had two GSRs, one in KS and MN. There was also a DS-3 backbone link between the two GSRs, with universities accessing the via 7500s, ATM DS-3s and OC-3s to the ‘nearest’ GSR.
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GPN QoS Implementation Dave Hartzell, Raytheon, Greatplains Network, And the USGS.
Need for QoS • GPN (at the time) had two GSRs, one in KS and MN. • There was also a DS-3 backbone link between the two GSRs, with universities accessing the via 7500s, ATM DS-3s and OC-3s to the ‘nearest’ GSR.
Access to GPN • Some access links to the GPN (partial DS-3s) were filling up. • The universities were using H.323 to deliver class sessions, and the access circuits were experiencing congestion.
QoS on the GSRs • Goal: Implement Premium Service and Scavenger Service • Used MDRR with RED and Priority Queuing • Used CAR to more accurately track the occurrences of DSCP 8 and 46.
Monitoring GSRs • To monitor the GSRs, the Cisco CAR MIB was used. • There isn’t an easy way to track MDRR queuing on the GSRs, at least with the Engine 0 OC-12 POS interface.
GSR Performance • Right now, since we’re not pushing the OC-12 to the limit, we haven’t seen any problems with CPU utilization on the Engine 0 cards.
QoS on Access Circuits • Next, similar QoS functions needed to be put on the Access routers and the Campus border routers. • There was a need to support H.323 video within some of the state networks.
QoS on 7500s • IOS 12.1E was selected to support QoS over ATM PVCs. Other versions of IOS didn’t seem to work as advertised. • Cisco’s Modular Command Line QoS was used, in conjunction with QoS Device Manager 2.0
QoS on 7500s • Also, SNMP Tools and RRDTool were selected for monitoring…
Testing… • Testing was performed with IPerf and different DSCPs (ToS bytes) to verify actually queuing and shaping. • For the most part, everything (on the 7500s) worked well.
Analysis • For the most part, we tend to see more lower priority (Scavenger Service) traffic. • When H.323 video runs for distance education, we do see IP Prec 5. • There have been no complains regarding the quality of the video thus far.