Oif Port Reevaluation Example - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

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.
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 port has accepted a total bandwidth of 3000000
bps, and you set a limit of 2000000 bps on the port, 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 port limit
of 2000000 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.
Chapter 1: Configuring IPv4 Multicast
Blocking and Limiting Multicast Traffic
29