Limiting Interface Admission Bandwidth; Enabling Interface Admission Bandwidth Limitation; Oif Interface Reevaluation Example - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - MULTICAST ROUTING CONFIGURATION GUIDE 2010-10-07 Configuration Manual

JunosE 11.3.x Multicast Routing Configuration Guide

Limiting Interface Admission Bandwidth

ip multicast admission-bandwidth-limit
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Use the no version to restore the default behavior of creating mroutes on received
multicast packets.
See ip block-multicast-sources.
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).
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.

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:
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.
If the bandwidth limit is decreased, no currently admitted OIFs are blocked. However,
no new OIFs are admitted until the total admitted bandwidth for the interface drops
below the new limit.
Copyright © 2010, Juniper Networks, Inc.