The reverse-oif-mapping statement enables the router to identify a subscriber VLAN or interface based on an IGMP or MLD join or leave request it receives over the multicast VLAN. Once the subscriber VLAN is identified, the router immediately adjusts the quality of service (in this case, the bandwidth) on that VLAN based on the addition or removal of a subscriber.
If you want to introduce a delay to the QoS update, you can use the subscriber-leave-timer statement. This statement defines a time delay (between 1 and 30 seconds) that the router waits before updating the QoS for the remaining subscriber interfaces after receiving an IGMP or MLD leave request. You might use this delay to decrease how often the router adjusts the overall QoS bandwidth on the VLAN when a subscriber sends rapid leave and join messages (for example, when changing channels in an IPTV network).
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Note: The router uses IGMP and MLD join or leave reports to obtain the subscriber VLAN information. This means that the connecting equipment (for example, the DSLAM) must forward all IGMP and MLD reports to the router in order for this feature to function properly. Using report suppression or IGMP proxy can result in reverse OIF mapping not working properly. |
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interface interface-name {
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reverse-oif-mapping;
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subscriber-leave-timer seconds;
- }
You can include this statement at the following hierarchy levels:
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