BT\'s work on supporting multicast on its new 21CN next-generation network.

1. Multicast 27 February 2007 Broadband Working Group Presentation

2. Technical Roadmap -Q2 Launch Q2 Q4 Q6 Q8 Beta Trial WBC as per product Spec. Improved control over line stability/speed Multicast – IGMP to AP 1024 upstream on ADSL2+ Time table shows Quarters before and after Launch ADSL2+ Annex M Multicast – IGMP to CMSAN

4. WBC Architecture CP EU BRAS B roadband E dge A ggregator Ethernet Aggregation Point (20 Nodes) MSAN (5500 Nodes) DSL Access ADSL2+ single VC PPPoE or oA (oE only for multicast) dedicated to EU Access Aggregation contended, shared amongst multiple EUs PPPoE with IA Aggregation Point Physically shared, logically separate per CP Comprehensive QoS features Customer Access links uncontended, dedicated to each Communications Provider. L2TP or PTA * * * *

6. BRAS downstream QoS - SVLAN view

7. BRAS downstream QoS - CVLAN view

9. WBC Replication Points CP EU BRAS BEA Ethernet Potential Multicast Replication Points Aggregation Point (20 Nodes) MSAN (5500 Nodes) * * * *

11. Phase 1 Multicast Architecture Multicast across WBC network IGMPv2 joins to BRAS Static configured Multicast between BEA to cMSAN Static Multicast Routing

12. Phase 2 Multicast Architecture MSAN BRAS AMSAN Dynamic joins via IGMP snooping Static replication PIM-SM or SSM, not DM Dynamic joins via IGMP Green IGMP requests suppressed Red IGMP reports supressed Dynamically send newly requested streams Dynamic joins via IGMP Black IGMP reports suppressed No green IGMP queries - Mixture of statically configured and dynamic paths to get a scalable system – BW and control - Static paths are end to end or partial - Need to optimise where paths, requests, reports and queries originate/terminate * * * *

13. Multicast CAC C M S A N BRAS STB CPE IGMP CAC M/C Head End Multicast Stream IPoE Multicast IGMP/PPPoE Multicast VLAN Broadband VLAN Video Play Request Multicast Join Authorisation M/C reserve M/C granted D/S line rate A/S status M/C status IGMP CP BTW CP IGMP signals M/C join to BRAS which re-profiles EU CAC function will have to maintain state on EU multicast session so that a subsequent request for an advanced service takes into account the bandwidth already in use for multicast BB Customer Reporting (BBCR) 2 logical interfaces over single VC

15. PoC Target Network Home Access Metro CP Application / Content BRAS Eth SW Router Services (RADIUS, ADQ etc.) Model IP Network Eth SW Router Adastral IP Network PC STB CPE Router Test Content Router (PIM) MSAN GE