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 Border Gateway Protocol

Multicast?  Will my institution use multicast?  If 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) Router protocols (HSRP) Clustered Systems Clustered Systems Imaging Servers and Clients 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) IGMP (Internet Group Management Protocol) Newer switches CGMP (Cisco Group Management Protocol) CGMP (Cisco Group Management Protocol) Older switches IGMP Snooping 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. Rendezvous Points How many and where? Rendezvous Points How many and where?  Reverse Path Forward (RPF) If you have networks with multiple router paths RPF checks may fail. If you have networks with multiple router paths RPF checks may fail.  What does you campus Router (Layer 3) design look like? Does it need to be on all routers? Which routers? Does it need to be on all routers? Which routers? Does it need to be on all interfaces? Which Interfaces? Does it need to be on all interfaces? Which Interfaces? Depending on your design enabling multicast my be an all or everything proposition. 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). You should have your own Autonomous System Number (ASN) from ARIN (American Registery for Internet Numbers). Use a GLOP calculator to Convert ASN to public multicast address space. Use a GLOP calculator to Convert ASN to public multicast address space.  Modify filters to permit sourcing of only valid multicast.  Public vs Private Multicast addresses

Campus Planning for Multicast  Questions?