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.
mroute port admission-bandwidth-limit
• 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.
Copyright © 2010, Juniper Networks, Inc.28
JunosE 11.2.x Multicast Routing Configuration Guide
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