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    OIF Interface Reevaluation for IPv6

    If you change the admission bandwidth for an interface, all mroutes with that interface as an outgoing interface (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 bits per second (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 Multicast Listener Discovery (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.

    Published: 2014-08-20