Juniper JUNOSE 11.1.X MULTICAST ROUTING, Configuration Manual

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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.
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If the bandwidth is increased to the point that the bandwidth limit for an interface
is now exceeded, no currently admitted OIFs for the affected mroutes are blocked.
However, no new OIFs are admitted until the total admitted bandwidth drops
below the configured limit.
NOTE: If the multicast bandwidth map that includes the set admission-bandwidth
command is changed, all affected mroutes are reevaluated in the same manner
described previously.
As an example of this function, if the interface has accepted a total bandwidth of
2000000 bps, and you set a limit of 1000000 bps on the interface, the router does
not disconnect any already connected OIFs but prevents the interfaces from accepting
any more groups. Over time, some groups leave the interfaces and, eventually, the
interface limit of 1000000 bps is reached and maintained by the router.
If you set limits for both a port and interfaces on that port, the router uses the lower
of the two limits when determining whether or not an interface can accept any new
MLD groups. For example, if you specify an admission bandwidth limit of 2000000
bps for the port and 3000000 bps groups for each interface, additional groups can
only be accepted until the port limit of 2000000 bps is reached.
Creating Mroute Port Limits
When a multicast forwarding entry (that is, an mroute) is added with an outgoing
interface (OIF) on a port, the OIF count for that port is incremented. If you configure
a port limit and the OIF count on the port count exceeds that limit, no OIFs on that
port are added to mroutes (that is, new OIFs are blocked).
mroute port limit
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Use to configure a limit on the number of mroute OIFs that can be added across
different virtual routers, on a port.
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Example
host1(config)# mroute port 3/0 limit 10
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Use the no version to remove any OIF port limits.
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See mroute port limit.
Limiting Port Admission Bandwidth
Port-level multicast admission control is performed when an OIF on that port 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).
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Blocking and Limiting Multicast Traffic
JUNOSe 11.1.x Multicast Routing Configuration Guide