Enabling Interface Admission Bandwidth Limitation
You can use the ip multicast admission-bandwidth-limit command to enable multicast
admission control on interfaces (including dynamic IP interfaces) that are configured to
run IGMP. You can also use this command on a PIM (sparse-mode, dense-mode, or
sparse-dense-mode) interface if IGMP is configured on the interface (including the ip
igmp version passive command).
ip multicast admission-bandwidth-limit
• Use to limit bandwidth for an interface that accepts IGMP groups.
• Example
host1:boston(config-if)#ip multicast admission-bandwidth-limit 2000000
• Use the no version to remove the bandwidth limitation for the interface.
• See ip multicast admission-bandwidth-limit.
OIF Interface Reevaluation Example
If you change the admission bandwidth for an interface, all mroutes with that interface
as an OIF are reevaluated as follows:
•
If the bandwidth limit is increased, blocked OIFs may become unblocked. If the interface
is a blocked OIF on multiple mroutes, the order in which the mroutes are visited, and
which (S,G) streams become unblocked, is not specified.
•
If the bandwidth limit is decreased, no currently admitted OIFs are blocked. However,
no new OIFs are admitted until the total admitted bandwidth for the interface 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 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.
Copyright © 2010, Juniper Networks, Inc.26
JunosE 11.2.x Multicast Routing Configuration Guide
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