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Unicast Versus Multicast in Networking: A Comprehensive Overview

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Understand the differences between unicast and multicast, including pros and cons, bandwidth requirements, scalability, and network implications. Learn how to enable multicast and optimize your network infrastructure.

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Unicast Versus Multicast in Networking: A Comprehensive Overview

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  1. Multicast Overview Webcast Joshua Ferguson Cisco Systems, Inc. Advanced Services josfergu@cisco.com

  2. Unicast Versus Multicast Unicast • Pros: • Less Configuration • Less hardware limitations • Cons: • More Bandwidth Required. Can be • calculated as (number of streams * • bandwidth of stream in kbps) • Server must be able to scale to • handle the number of connections.

  3. Unicast Versus Multicast Multicast • Pros: • Less bandwidth is required, the • net effect on the network is one • traffic stream. • Server’s can easily scale to • support multiple broadcasts • Cons: • Network must be multicast • enabled. • Hardware must support multicast, • switches should support IGMP • snooping in hardware. 239.10.10.10

  4. Inter-Agency Streaming Video • In order to perform Inter-Agency Video streaming the stream will need to be delivered to the Agency VRF as a Unicast. There are several reasons for this; • Difficulty with Multicast through Firewalls • Overlapping Group Addresses and Multicast Domains • The solution is to deliver a single unicast stream into the customer VRF and then use a media server to take that stream and multicast to the agency.

  5. Inter-Agency Streaming Video DIS Video Server SGN Agency VRF Agency VRF Unicast Multicast

  6. Overview of Enabling Multicast • Enable “ip multicast-routing” on all of the multicast routers. • Enable PIM on the LAN and WAN Interfaces. • Configure an RP, preferably Auto-RP, on one or more core devices. • Contact DIS NCC to multicast enable your VRF.

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