# IPv6 Multicast Bandwidth Map Overview

Multicast interface-level admission control, port-level admission control, and QoS adjustment all use a single multicast bandwidth map. The multicast bandwidth map is a route map that uses the set admission-bandwidth, set qos-bandwidth, set admission-bandwidth adaptive, or set qos-bandwidth adaptive commands. The adaptive commands configure an auto-sense mechanism for measuring the multicast bandwidth.

| Note: Even though you can include any of the above commands several times in a route map entry, only the last admission-bandwidth command or qos-bandwidth command in the bandwidth map is used. In other words, if you included the set qos-bandwidth command first and then the set qos-bandwidth adaptive command, the bandwidth map would use the set qos-bandwidth adaptive command.

Interface- and port-level admission control is performed when an outgoing interface (OIF) on the interface or port is added to the mroute for a given (S,G) multicast data stream and the multicast bandwidth map contains a set admission-bandwidth or set admission-bandwidth adaptive action for that (S,G).

QoS adjustment is performed on the joining interface when an OIF is added to the mroute for a given (S,G) data stream and the multicast bandwidth map contains a set qos-bandwidth or set qos-bandwidth adaptive action for that (S,G).

| Note: You can create a single route map with the set admission-bandwidth command, the set qos-bandwidth command, or both. However, creating an entry with only one of these set commands enables only that specific function for the matched address (that is, only multicast traffic admission control or only QoS adjustment). The same is true for the adaptive commands.

#### Related Documentation

- IPv6 Multicast Overview
- Autosense Mechanism Overview
- Adaptive Mode Mechanism Overview
- Example: Configuring an IPv6 Multicast Bandwidth Map
- set admission-bandwidth
- set qos-bandwidth