Limiting Interface Admission Bandwidth; Enabling Interface Admission Bandwidth Limitation; Oif Interface Reevaluation Example - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

JUNOSe 11.0.x Multicast Routing Configuration Guide

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 OIF 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 10 for
details.

Enabling Interface Admission Bandwidth Limitation

You can use the ip multicast admission-bandwidth-limit command to enable
multicast admission control on interfaces (including dynamic IP interfaces) that are
configured to run IGMP. You can also use this command on a PIM (sparse-mode,
dense-mode, or sparse-dense-mode) interface if IGMP is configured on the interface
(including the ip igmp version passive command).
ip multicast admission-bandwidth-limit

OIF Interface Reevaluation Example

If you change the admission bandwidth for an interface, all mroutes with that interface
as an OIF are reevaluated as follows:
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Blocking and Limiting Multicast Traffic
host1(config-if)#ip block-multicast-sources
Use the no version to restore the default behavior of creating mroutes on received
multicast packets.
See ip block-multicast-sources.
Use to limit bandwidth for an interface that accepts IGMP groups.
Example
host1:boston(config-if)#ip multicast admission-bandwidth-limit 2000000
Use the no version to remove the bandwidth limitation for the interface.
See ip multicast admission-bandwidth-limit.
If the bandwidth limit is increased, blocked OIFs may become unblocked. If the
interface is a blocked OIF on multiple mroutes, the order in which the mroutes
are visited, and which (S,G) streams become unblocked, is not specified.