Multicast Weathermap. Athanasios Douitsis NTUA NOC. Dimitrios Kalogeras NTUA NOC

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1 Multicast Weathermap Athanasios Douitsis NTUA NOC Dimitrios Kalogeras NTUA NOC

2 Outline Introduction Implementation Interface Conclusions

3 Introduction

4 The problem of Multicast Today Easy to deploy, difficult to manage. Administrators are less experienced in managing multicast Good tools for the multicast domain are scarce (unlike unicast) Poor interface in many tools

5 Popular Multicast Monitoring Tools Using SNMP Muvi (Multicast Visualization Tool) Mmon (multicast plugin for the HP Openview NNM ) Using active probes Command-line tools like mtrace Multicast Beacon

6 Qualities of a multicast management tool Accuracy of reported information Integrity of reported information Intuitive presentation and interface Simplified usage (e.g. Easy learning curve)

7 Qualities of a multicast management tool (cnt'd) Standards Compliance Adequate speed Sufficient backlog Extensibility of functions Generalized design

8 Web based interface Design Quantitative and Qualitative display of multicast traffic Simplified usage (no manuals please!) Presentation of highly processed and filtered data Separation of instrumentation and presentation

9 Design(cnt'd) Use of standard SNMP MIB's IP multicast routing MIB PIM MIB IGMP MIB Other arbitrary MIB's

10 functions Display of multicast distribution paths. Measurement of overall multicast traffic Fine grained measurement of group specific traffic IGMP memberships display Incoming/Outgoing groups for each node Other per-node information through plugins

11 Modular Architecture Data Collector: Raw information from managed nodes Data Processor: Meaningful data from raw information Presentation mechanism: Visualisation of available information Storage mechanism

12 Implementation

13 IGMP membership discovery Usage of the Internet Group Management Protocol MIB IgmpCacheTable Interface Group IGMP version

14 Layer 3 topology discovery using PIM Protocol Independent Multicast MIB Discovery of PIM neighbours for each managed node Correct handling of multi-access segments Inclusion of multicast enabled links only Construction of tree at the last step

15 Overall traffic measurement IP multicast routing MIB Usage of topology information obtained earlier All groups traffic measurement Multicast route interface table Mrtg or RRD on top.

16 Group-specific multicast traffic calculation Polling of multicast routing table in ipmroute-mib Nexthop table in ipmroute-mib Calculation of receivers and transmitters for all known groups Discovery of all known sources Construction of traffic matrix for all groups

17 Group-specific multicast traffic calculation (cnt'd) Shortest path tree or shared tree calculation from traffic matrix Possible filtering of active links and sources only Exporting in intermediate format Measurement function available to presentation modules

18 Interface

19 Visualisation of overall traffic Nodes visible as geographic locations Multicast-enabled links appear as arrows Colour reveals amount of traffic Diagram available by hovering over link (Live demo at ttp://netmon.grnet.gr/multicast-map.shtml)

20 Visualisation of overall traffic Hovering over node reveals: IGMP memberships Incoming groups Outgoing groups MSDP cache size Other pluggable modules (cnt'd)

21 Visualisation of group-specific Group selected from menu Again, nodes visible as geographic locations Only links carrying specific group traffic appear Colour reveals amount of traffic traffic

22 Conclusion

23 Implementation Benefits Easily extensible mechanism Separation of data from presentation Storage of refined data easily achievable Suitable for majority of today's multicast enabled networks But: Extremely time consuming raw data collection phase

24 Interface Advantages Independent from instrumentation Usage of caches guarantees extremely fast response Intuitive display of refined data Graphic generation code borrowed(*) from the original weathermap probably reusable elsewhere also. (*) Blatantly copied from Panagiotis Christias' network weathermap

25 Thank you very much! Any Question???

List of groups known at each router. Router gets those using IGMP. And where they are in use Where members are located. Enhancement to OSPF

List of groups known at each router. Router gets those using IGMP. And where they are in use Where members are located. Enhancement to OSPF Multicast OSPF OSPF Open Shortest Path First Link State Protocol Use Dijkstra s algorithm (SPF) Calculate shortest path from the router to every possible destination Areas Limit the information volume