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JunosE 11.3.x Multicast Routing Configuration Guide
Defining a Multicast Bandwidth Map
Using the Auto-Sense Mechanism
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host1(config)#ipv6 multicast-routing permanent-mroute routesv61
Use the no version to prevent any new mroutes from becoming permanent. To remove
existing permanent mroutes, use the clear ipv6 mroute command.
See ipv6 multicast-routing permanent-mroute
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 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.
Video bandwidth is typically considered to be a constant rate—2 Mbps for standard
definition television (SDTV) and 10 Mbps for high definition television (HDTV). However,
in reality, and depending on achievable video compression, the bit rate can vary. For
example, HDTV streams (using MPEG4 or WM9 encoding) can vary between 6 Mbps
(for low-action programs) to 10 Mbps (for a fast-paced, high-action programs). The
auto-sense mechanism allows the bandwidth value, used for admission control and QoS
adjustment, to be the actual measured rate of the stream. Using this feature to measure
Copyright © 2010, Juniper Networks, Inc.
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