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Blocking Mroutes

By default, when an interface receives multicast traffic, even when the scope of that

traffic exceeds link-local, the virtual router creates an mroute. You can use the ipv6

block-multicast-sources command to block all multicast traffic with a scope larger than

link-local (for example, global) and prevent mroute creation under these conditions.

NOTE: Issuing this command does not affect reception of link-local multicast packets.

ipv6 block-multicast-sources

• Use to prevent mroute creation by blocking multicast traffic that has a scope larger

than link-local (for example, global).

• Example

host1(config)#ipv6 block-multicast-sources

• Use the no version to restore the default behavior of creating mroutes on receiving

multicast packets.

• See ipv6 block-multicast-sources.

Limiting Interface Admission Bandwidth

Interface-level multicast admission control is performed when an OIF on the interface

is added to the mroute for a given (S,G) multicast data stream and the multicast

bandwidth map contains a set admission-bandwidth action for that (S,G).

When enabled, the admission-bandwidth for a particular (S,G) is read from the multicast

bandwidth map and recorded in the mroute when the (S,G) mroute is created. When an

IOF is subsequently added to the mroute, the OIF is blocked from forwarding data if the

additional bandwidth contributed by the (S,G) would exceed the admission-bandwidth

limit for the interface.

CAUTION: Before you can limit interface-level admission bandwidth, you must first

create a bandwidth map. See “Defining a Multicast Bandwidth Map” on page 148 for

details.

Enabling Interface Admission Bandwidth Limitation

You can use the ipv6 multicast admission-bandwidth-limit command to enable

multicast admission control on interfaces (including dynamic IP interfaces) that are

configured to run MLD. You can also use this command on a PIM (sparse-mode,

dense-mode, or sparse-dense-mode) interface if MLD is configured on the interface

(including the ipv6 mld version passive command).

ipv6 multicast admission-bandwidth-limit

JunosE 11.2.x Multicast Routing Configuration Guide

Juniper JUNOSE 11.2.X MULTICAST ROUTING User Manual

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