Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - MULTICAST ROUTING CONFIGURATION GUIDE 2010-10-07 Configuration Manual page 188

JunosE 11.3.x Multicast Routing Configuration Guide
Creating Mroute Port Limits
mroute port limit
Limiting Port Admission Bandwidth
166
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.
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).
Use to configure a limit on the number of mroute OIFs that can be added across different
virtual routers, on a port.
Example
host1(config)#mroute port 3/0 limit 10
Use the no version to remove any OIF port limits.
See mroute port limit.
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).
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
IOF 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 port on which the interface resides.
CAUTION: Before you can limit port-level admission bandwidth, you must
first create a bandwidth map. See "Defining a Multicast Bandwidth Map" on
page 150 for details.
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