To Next Page

To Previous Page

3. Reconfigure auto-RP candidate RPs as BSR candidate RPs by issuing the no ip pim

send-rp-announce command and then issuing the ip pim rp-candidate command.

Switching to an SPT for PIM Sparse Mode

PIM sparse mode initiates multicasting using a shared tree. You can configure PIM sparse

mode to switch to an SPT when a source starts sending multicast messages, or you can

prevent PIM sparse mode from switching to an SPT. Multicasting over an SPT might be

more efficient than multicasting over a shared tree. (See “PIM Sparse Mode” on page 80.)

ip pim spt-threshold

• Use to specify when PIM sparse mode switches from a shared tree to an SPT.

• Specify a nonzero integer or the keyword infinity to prevent PIM sparse mode from

switching to an SPT.

• Specify a value of 0 (default) to configure PIM to switch to an SPT when a source

starts sending multicast messages.

• Example

host1(config)#ip pim spt-threshold 4

• Use the no version to restore the default value, 0.

• See ip pim spt-threshold.

Creating Multicast VPNs

JunosE router software provides the ability to create multicast VPNs by using GRE tunnels.

This implementation is based on Multicast in MPLS/BGP VPNs

(draft-rosen-vpn-mcast-06.txt and draft-rosen-vpn-mcast-08.txt) and further defined

by Base Specification for Multicast in MPLS/BGP VPNs

(draft-raggarwa-13vpn-2547-mvpn-00.txt).

NOTE: Although you can configure PIM sparse mode remote neighbors, you can no

longer use these remote neighbors for BGP/MPLS VPNs. For multicast VPNs, use the

functionality described in this section.

The JunosE Software supports default Multicast Distribution Trees (MDTs) and data

MDTs.

Creating Multicast VPNs Using the Default MDT

The JunosE Software does not support a single MDT command. Instead, you must

configure the multicast tunnel interfaces (MTIs) explicitly. The MTI is an IP interface that

is stacked on a GRE tunnel interface. The destination address of the GRE tunnel is the

multicast VPN (MVPN) group address of the MDT.

A tunnel mdt command specifies that the tunnel is the MTI for the default MDT, enabling

the creation of a second, layer 2 interface (interface tunnel gre:name.mdt) on which an

JunosE 11.2.x Multicast Routing Configuration Guide

Juniper JUNOSE 11.2.X MULTICAST ROUTING User Manual

Questions and Answers: