• Use to limit bandwidth for an interface that accepts MLD groups.
• Use on any interface configured to run MLD.
• Can also configure on a PIM (sparse-mode, dense-mode, or sparse-dense-mode)
interface if MLD (which you can configure using the ipv6 mld version passive
command) is also configured on the interface.
• Example
host1:boston(config-if)#ipv6 multicast admission-bandwidth-limit 2000000
• Use the no version to remove the bandwidth limitation for the interface.
• See ipv6 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 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.
Creating Mroute Port Limits
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
163Copyright © 2010, Juniper Networks, Inc.
Chapter 5: Configuring IPv6 Multicast
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