Multicast Support for Dual Stack Lite and 6RD Behcet Sarikaya draft-sarikaya-softwire-dslite6rdmulticast-00.txt

DS-Lite Multicast DS-Lite B4 MUST support IGMP Proxy IPv6 IPv4 IPv6 Internet Private IPv4 Address IPv6 Network IPv4 AFTR - CGN 4-in-6 tunnel IPv4 Internet Home Network NAT44 (Private->Public) B4 - CPE (dual-stack) IPv6 IGMP Proxy IGMP Querier DS-Lite B4 MUST support IGMP Proxy DS-Lite AFTR MUST support IGMP Querier ASM/SSM transparently supported

DS-Lite Multicast Operation B4 establishes a tunnel interface with AFTR IGMP messages and v4 multicast data are carried in v4 in v6 tunnel between B4 and AFTR B4 sends aggregated IGMP report messages to AFTR B4 receives v4 multicast data, decapsulates it and then delivers it to the hosts Due to the shared link no duplication is needed AFTR acts as the default multicast querier for all B4s AFTR receives v4 multicast data, first replicates and then forwards in IPv4-in-IPv6 tunnel to B4s PROS: Encapsulation based no translation PROS: Does not require native multicast in access

6rd Multicast 6rd CPE MUST support MLD Proxy 6rd BR IPv4 IPv4 Network IPv6 Network CPE 6-in-4 tunnel IPv6 MLD Proxy MLD Querier 6rd CPE MUST support MLD Proxy 6rd BR MUST support MLD Querier ASM/SSM transparently supported

6rd Multicast Operation 6rd customer edge device (CPE) is MLD Proxy 6rd CPE establishes tunnel interface with 6rd BR MLD messages and v6 multicast data are carried in v6 in v4 tunnel between CPE and BR The protocol is analogous to DS-Lite multicast but instead of IGMP, MLD is supported PROS: Encapsulation based no translation PROS: Does not require native multicast in access