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A “ traceroute” Facility for IP Multicast—draft-ietf-idmr-traceroute-ipm-07.txt (January

2001 expiration)

Before You Begin

You can configure multicast on IPv4 and IPv6 interfaces.

For information about configuring IP interfaces, see Configuring IP in the JunosE IP, IPv6,

and IGP Configuration Guide. For information about configuring IPv6 interfaces, see

Configuring IPv6 in JunosE IP, IPv6, and IGP Configuration Guide.

For information about configuring multicast on IPv4 interfaces, see “Configuring IPv4

Multicast” on page 3.

Configuring the Switching Fabric Bandwidth

By default, the switch fabric for the ERX1440, ERX310, E120, and E320 Broadband Services

Routers uses a bandwidth weighting ratio of 15:2 for multicast-to-unicast weighted round

robin (WRR). In the absence of strict-priority traffic, and when both unicast and multicast

traffic compete for switch fabric bandwidth, the switch fabric allocates 15/17ths of the

available bandwidth to multicast traffic and 2/17ths of the available bandwidth to unicast

traffic.

You can use the fabric weights command to change the ratio for multicast to unicast

traffic on the router switch fabric. For more information about the fabric weights

command, see Managing the System in the JunosE System Basics Configuration Guide.

Enabling IPv6 Multicast

In this implementation, IPv6 multicast works on VRs. By default, IPv6 multicast is disabled

on a VR. To enable IPv6 multicast on a VR, access the context for a VR, and then issue

the ipv6 multicast-routing command.

ipv6 multicast-routing

• Use to enable IPv6 multicast routing on the VR.

• By default, IPv6 multicast is disabled on the VR. In the disabled state, all multicast

protocols are disabled, and the VR forwards no multicast packets.

• Example

host1(config)#ipv6 multicast-routing

• Use the no version to disable IPv6 multicast routing on the VR (the default).

• See ipv6 multicast-routing.

Defining Static Routes for Reverse-Path Forwarding

Use the ipv6 rpf-route command to define reverse-path forwarding (RPF) to verify that

a router receives a multicast packet on the correct incoming interface.

JunosE 11.2.x Multicast Routing Configuration Guide

Juniper JUNOSE 11.2.X MULTICAST ROUTING User Manual

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