Designing IP Multicast Services © 2004 Cisco Systems, Inc. All rights reserved. Designing IP Multicast Solutions for Enterprise Networks ARCH v1.28-1

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v IP Multicast Design Considerations Who is the source (server)? Which hosts can join a conversation? How do hosts join a conversation? Should PIM-DM or PIM-SM be used? If you are using PIM-SM, where should rendezvous points be placed? How should routers and links be provisioned to support IP multicast?

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v IP Multicast Design Recommendations IP addressing –Use multicast limited scope addresses (unless IP multicast traffic originates outside the enterprise). Security –Protect IP multicast traffic from denial-of-service attacks or stream hijacking by rogue sources and/or rogue rendezvous points.

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v IP Multicast Small Campus Design

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v IP Multicast Large Campus Design

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v IP Multicast over a WAN

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v Example: IP Multicast Addressing Scheme Multicast Groups Address Range ScopeRestrictions IP/TV High- Rate Traffic / – Site-local Restricted to local campus IP/TV Medium- Rate Traffic / – Enterprise-local Restricted to 768 kbps + sites IP/TV Low- Rate Traffic / – Enterprise-local Restricted to 256 kbps + sites Multicast Music-on-Hold / – Enterprise-local No restrictions

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v Summary When designing a network for IP multicast, you will want to consider the servers and hosts, IP multicast control mechanisms, PIM mode, and router provisioning. In a small campus design with a collapsed core and distribution layer, the backbone switches act as the rendezvous points for multicast forwarding. IP multicast design for a large campus needs to balance between granular administrative control and simplicity. When IP multicast traffic is to cross a WAN link, the primary consideration is that the WAN bandwidth not be overwhelmed by unnecessary traffic.

© 2004 Cisco Systems, Inc. All rights reserved. ARCH v Learning Activities Case Study: OCSIC Bottling Company –Develop an IP multicast design to support the companys new application –Provide justification for each design decision OPNET IT Guru Simulation –View the instructor demonstration and consider the key design questions