Cisco Systems UBR10012 IP Broadcast and Multicast Features

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Cisco uBR10012 Universal Broadband Router Software Configuration Guide

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Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software Supported Software Features for the CiscouBR10012 Router

•Cable Monitor and Intercept Features for the Cisco CMTS

http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide_chapter09186a00

8019b571.html

•PacketCable and PacketCable Multimedia on the Cisco CMTS

http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide_chapter09186a00

8019b576.html

•Cisco PacketCable Primer White Paper

http://www.cisco.com/en/US/netsol/ns341/ns121/ns342/ns343/networking_solutions_white_paper

09186a0080179138.shtml

IP Broadcast and Multicast Features

The Cisco uBR10012 router supports the following IP broadcast and Multicast features:

•IP Broadcast Echo

•IP Multicast Echo

•Multicast QoS Support on the Cisco uBR10012 CMTS

•SSM Mapping

You can activate upstream IP broadcast echo so that the CiscouBR10012router can echo broadcast

packets. For configuration information, refer to the “Setting Optional Broadcast and Cable IP Multicast

Echo” section on page28.

With this feature, you can send a copy of each multicast packet (received from a cable line card) to the

downstream ports associated with the MAC domain of the receiving US port. This feature allows for all CMs

within a MAC domain to receive multicast packets sent by a CM in the same MAC domain. For additional

information, refer to the “Setting Optional Broadcast and Cable IP Multicast Echo” section on page28.

Cisco IOS Release 12.3(13a)BC introduces support for Multicast downstream QoS feature. This feature

provides the ability to assign static mapping to a multicast group. The Multicast downstream QoS feature

uses the existing infrastructure (DOCSIS 1.1 service flow) to assign a multicast service identifier (SID)

to a multicast group used in the Baseline Privacy Interface (BPI) encryption feature.

When disabled, the Multicast downstream QoS feature does not impact any other features. The multicast

packets to downstream cable interfaces are sent to the default service flow.

This feature is being implemented in response to CSCeg22989 which states, multicast traffic is not

classified to any service flow, and therefore ends up queued on the default service flow. The default

service flow has no specific QoS guarantees assigned to it. So once the interface approaches congestion

level, multicast packets may be dropped.