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Enables Multimedia Networking with Scalable IP

Multicasting

A new class of multimedia applications is rapidly being

implemented from the Internet to the intranet. These applications

utilize IP multicasting, which provides a scalable method of

enabling large-scale voice and video networking. Multimedia

applications are delay sensitive while also requiring high

performance. The latest innovation from Cisco in the ﬁeld of

scalable IP multicast routing is Protocol Independent Multicast

(PIM). Cisco is driving its standardization in the Internet

Engineering Task Force (IETF) while PIM is also being rolled out

on Cisco routers in the Internet by all major Internet service

providers (ISPs). PIM enables large-scale deployment of

multicast applications spanning both the Internet and corporate

intranets, a scenario that was previously unachievable with

Distance Vector Multicast Routing Protocol (DVMRP).

The Catalyst 8500 series, by virtue of running the Cisco IOS

software, incorporates PIM and provides a scalable solution for

both sparse and dense mode IP multicasting. The sparse mode is

used for videoconferencing-type applications with a small

number of participants. The dense mode is used for video

broadcasting applications, and can be used for delivering

corporate training, customer presentations, and so on.

The delay-sensitive nature of multimedia applications places

stringent requirements on network response times. The Catalyst

8500 series alongside the complete Cisco end-to-end solution

provides the necessary delay prioritization to deliver the QoS

required to enable these applications.

Enables Network Intelligence with Cisco IOS Software

The Catalyst 8500 series enables intelligent network services using Cisco IOS software. Speciﬁc services that can be enabled include:

• Mobility—Features such as Dynamic Host Conﬁguration Protocol (DHCP) relay, BOOTP relay, and local-area mobility allow network

administrators to enable user mobility throughout a campus network. This setup eases the adds, moves, and changes process and provides

network managers a lower total cost of ownership.

• Security—TACACS+ and Remote Access Dial-In User Service (RADIUS) enable network administrators to secure the Catalyst 8500 series

switches; these tools can be managed in a common fashion with other Cisco routers and switches.

Eases Manageability

The Catalyst 8500 incorporates the Cisco IOS software and, therefore, it can be easily managed and conﬁgured by CiscoWorks and CRM. Its

Cisco IOS command-line interface (CLI) allows it to be conﬁgured and debugged in a common manner across all Cisco IOS products. Its

sophisticated debugging capabilities allow network administrators to effectively troubleshoot any problems that occur in the network.

Figure 5 The Cisco IP Multicast Solution Truly Enables End-to-End Voice and Video Networking

• PIM Dense Mode

– Broadcast and prune

– Senders and receivers in

close proximity

– Few senders, many receivers

• PIM Sparse Mode

– Explicit join

– Few receivers in multicast group

Cisco 7500

Video

Broadcast

IGMP snooping

CGMP L2 pruning

PIM

Multicast

Routing

Catalyst

5xxx

Catalyst

5500/8500

WinSock 2.0

Internet/

MBONE

WAN

• CGMP Layer 2 pruning and

IGMP snooping

– Enable IP multicast

intelligence on Layer 2 switches

– Multicasts sent only to

specific receivers and not

broadcast throughout subnet

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