 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
A data multicast distribution tree (MDT), based on section 8 of Internet draft draft-rosen-vpn-mcast-08.txt, Multicast in MPLS/BGP IP VPNs, solves the problem of P routers flooding unnecessary multicast information to PE routers that have no interested receivers for a particular VPN multicast group. The data MDT solution requires the creation of a new tunnel by the PE router if the source exceeds a configured rate threshold parameter. All other PE routers join the new tunnel only if the PE router has receivers in the VPN for that multicast group.
The JUNOSe software uses dynamic point-to-multipoint GRE tunnels to configure data MDTs. In the current release, IPv6 transport over GRE (unicast or multicast) is not supported. For more information, see Configuring Dynamic IP Tunnels in the JUNOSe IP Services Configuration Guide.
Data MDTs are established using PIM-SM (shared RP Trees) and PIM-SSM (Source Trees). Profiles for dynamic interfaces in the VRF are restricted to sparse-mode only.
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |