1. Internet2 Measurement Perspective
Guy T. Almes
Matt Zekauskas
SD Measurement Workshop
June, 1999

2. General Goal of Internet2
Support advanced applications
High bandwidth flows
Low latency
Low loss
Advanced services
Multicast
Quality of service guarantees

3. ‘My application has a problem’
Application, End-host, Network?
Passive measurements could help divide the problem
Consistent measurements throughout Internet2 infrastructure could help diagnose network problems

4. Backbone ‘A’
Backbone ‘B’

5. Backbone ‘A’
Backbone ‘B’

6. Backbone ‘A’
Backbone ‘B’

7. Other Measurement Goals
(Forward) network engineering
Enable network research
Feedback to applications
Operational data
performance, flows, anomalies
Network characterization
how used? load response? SLS?

8. Measurement Classification
Utilization [usually SNMP]
Active measurements
~Performance (one-way delay, loss, throughput)
Passive measurements
~Traffic characterization
Routing [usually BGP/traceroute]

9. Utilization Technically “easy”; “boring”
Coordinate type, frequency … and reporting
A small number of frequency multiples
15 sec, 1 min, 4 min

10. Utilization II Standardize file format Single access mode
Example: relative URL for routers
Example: single I2 measurement page

11. Active measurements delay loss
throughput? (don’t want to interfere with apps)
my point of view: approximately Surveyor, +(?) throughput
Packet sizes? Distribution?

12. Passive Measurements
Question: how apply passive measurements effectively in a consistent fashion?
Something that is useful to all?
Each additional probe adds value?
Perhaps flow data
What about packet headers? And security...

13. Routing Can’t just measure one point: policy E-E measurements:
surveyor
AMP
consistency/access problems a-la utilization
RA? Routing protocol sniffing? Traceroute observatories?

14. Examples Remote microscope Videoconference from Lund to Pittsburgh
UDP, blasting packets
OCxMON shows more packets than capacity
Videoconference from Lund to Pittsburgh
Packet loss… don’t know why

15. Desires
Want some way to know where loss occurs when it happens (or delay)
Advanced service debugging
Multicast
QoS (QBone designing measurement in)
Service level specification conformance

16. Desires
Application reflectors along with routers? (Is this measurement?)

17. Summary Consistent measurement of That are made generally available
Utilization
Performance
Traffic Characterization
That are made generally available
In support of applications and the networks themselves

18. TM