GPN QoS Implementation

1
GPN QoS Implementation

• Dave Hartzell, Raytheon,
• Greatplains Network,
• And the USGS.

2
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.

3
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.

4
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.

5
Monitoring GSRs

• To monitor the GSRs, the Cisco CAR MIB was used.
• There isnt an easy way to track MDRR queuing on
  the GSRs, at least with the Engine 0 OC-12 POS
  interface.

6
GSRs, SNMP Tools, and RRDTool
7
GSR Performance

• Right now, since were not pushing the OC-12 to
  the limit, we havent seen any problems with CPU
  utilization on the Engine 0 cards.

8
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.

9
QoS on 7500s

• IOS 12.1E was selected to support QoS over ATM
  PVCs. Other versions of IOS didnt seem to work
  as advertised.
• Ciscos Modular Command Line QoS was used, in
  conjunction with QoS Device Manager 2.0

10
QoS on 7500s

• Also, SNMP Tools and RRDTool were selected for
  monitoring

11
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.

12
Testing of QoS on ATM PVCs
13
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.

14

• Thanks.