Campus Planning for
Multicast
Frank Aversa, NJIT
Jim Stankiewicz, Verizon
Business
Campus Planning for Multicast
 The
function of campus multicast assumes
you have installed and have operational
Interdomain Multicast Routing.

Multicast Border Gateway Protocol
Multicast?
 Will
 If
my institution use multicast?
Yes, Will we only need to listen
 Or,
do we plan to source multicast as well.
 What
mutlicast applications will we use?
Multicast General
 What
multicast is currently on the
network?



Router protocols (HSRP)
Clustered Systems
Imaging Servers and Clients
 Are
they using the correct addresses?
What addresses are being used!?
Multicast listening layer 2

What are the multicast capabilities of my switches?
Layer 2 distribution is an integral part of receiving IP Multicast properly
without flooding your network.

IGMP (Internet Group Management Protocol)
Newer switches

CGMP (Cisco Group Management Protocol)
Older switches

IGMP Snooping
High performance switches


Does your multicast pass through a packet shaper?
Layer 2 Multicast is predicated on a working Layer 3
Multicast framework.
Multicast Listening Layer 3

PIM Spase mode
Uses unicast routing protocols to build a sparse data distribution tree for multicast.


Reverse Path Forward (RPF)





If you have networks with multiple router paths RPF checks may fail.
What does you campus Router (Layer 3) design look like?


Rendezvous Points
How many and where?
Does it need to be on all routers? Which routers?
Does it need to be on all interfaces? Which Interfaces?
Depending on your design enabling multicast my be an all or everything
proposition.
Does the Multicast pass through a firewall
Apply filters to block all multicast sources originating inside your
network but the ones you permit.
Sourcing Multicast

Yes, my Institution will source multicast?

You should have your own Autonomous System
Number (ASN) from ARIN (American Registery for
Internet Numbers).
http://www.arin.net/registration/templates/asn-request.txt

Use a GLOP calculator to Convert ASN to public
multicast address space.
http://gigapop.uoregon.edu/glop/


Modify filters to permit sourcing of only valid multicast.
Public vs Private Multicast addresses
Campus Planning for Multicast
 Questions?