Multicast over Layer 3 VPNs

In JUNOS software Release 5.3, Juniper Networks began support for multicast over Layer 3 VPNs (as described in RFC 2547). The implementation is based on Section Two of the IETF Internet draft Multicast in MPLS/BGP VPNs (draft-rosen-vpn-mcast-00.txt) and uses Protocol Independent Multicast (PIM) and Generalized Routing Encapsulation (GRE) tunneling. Initially, only PIM sparse mode was supported. In JUNOS Release 5.5, Layer 3 VPN multicast support is extended to include PIM dense mode.

This document assumes the reader is familiar with Layer 3 VPN operation on Juniper Networks routers, as well as standard PIM configurations. For more information on PIM and its usage in a Layer 3 VPN, see the JUNOS 5.5 Internet Software Configuration Guide: Multicast. For more information on Layer 3 VPN configuration, see the JUNOS 5.5 Internet Software Configuration Guide: VPNs. Both manuals are located at: http://www.juniper.net/techpubs/software/junos/junos55.

This feature guide covers these topics:

• Overview
• System Requirements
• Terms and Acronyms
• Configuring Multicast for Layer 3 VPNs

• Example: Basic Multicast over a Layer 3 VPN Configuration
• Check Your Work
• Example: Multicast with Interprovider VPNs
• Check Your Work

• For More Information
• Revision History