Oif Port Reevaluation Example - Juniper JUNOSE 11.2.X MULTICAST ROUTING Configuration Manual

JunosE 11.2.x Multicast Routing Configuration Guide
mroute port admission-bandwidth-limit
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Dynamic Port Admission Bandwidth Control
You can configure the system to dynamically limit the total multicast bandwidth that
can be admitted on a port. The system performs dynamic port-level admission control
when an OIF on that port is added to the mroute for a given <S, G> multicast stream.
After the priority bandwidth limit on the port is reached, OIFs on the prioritized <S, G>
are only allowed to forward the traffic and unprioritized <S, G> streams are blocked from
forwarding data on the OIF.
To enable a priority value for the <S, G> multicast stream, issue "set priority" on page 14
in the multicast bandwidth map. A priority value of 0 indicates an unprioritized stream
and any value other than 0 indicates a prioritized stream. Currently there is no support
for classification of prioritized streams. For more information about the set priority
command, see "Defining a Multicast Bandwidth Map" on page 10 .
You can configure limits for the bandwidth that is dynamically admitted on the port. The
priority bandwidth limit controls the priority bandwidth admitted on a port. The hysteresis
limit sets the minimum priority bandwidth limit before the system evaluates mroutes
and admits any blocked OIFs.
Use to configure a limit on the total multicast bandwidth that can be admitted on a
port.
Use the priority-bandwidth-limit keyword to configure the priority bandwidth admitted
on a port.
Use the hysteresis keyword to configure the minimum priority bandwidth limit before
the system evaluates mroutes and admits any blocked OIFs.
Example
host1(config)#mroute port admission-bandwidth-limit 3000000
Use the no version to remove any OIF admission bandwidth limits.
See mroute port admission-bandwidth-limit

OIF Port Reevaluation Example

If you change the admission bandwidth for a port, all mroutes with an OIF on that port
are reevaluated as follows:
If the bandwidth limit is increased, blocked OIFs can become unblocked. However, the
order in which the mroutes are visited, and which (S,G) streams become unblocked,
is not specified.
If the bandwidth limit of a port is decreased, no currently admitted OIFs are blocked.
However, no new OIFs are admitted until the total admitted bandwidth for the port
drops below the new limit.
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.
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