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Creating Mroute Port Limits
mroute port limit
Limiting Port Admission Bandwidth
Copyright © 2010, Juniper Networks, Inc.
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 IGMP
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 exceeds that limit, no OIFs on that port are added to mroutes
(that is, 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. If you
configure a port limit and the OIF count on the port exceeds that limit, no OIFs on that
port are added to mroutes (that is, OIFs are blocked).
Chapter 1: Configuring IPv4 Multicast
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