multicast address

[mcanzano]

Who designates the multicast group address ? For example group 239.193.34.149 is associated with multiple vlans > is it the server applications > no where in the running config on a csco6500 native IOS (msfc02) do i see multicast addressess> the port-channels and vlans are configured for ip-pim sparse mode > igmp sh ip igrp groups ? thank you

[ERIK LAWAETZ]

The multicast group addresses you're seeing in your networks multicast routing tables are chosen by the senders/receivers of each group.

They represent various multicast applications, for instance a video streaming service for which the video server chooses a particular group address.

ftp://ftpeng.cisco.com/ipmulticast/whitepapers/technology_overview/index.html#xtocid51124

provides an overview of the various multicast addresses.

http://www.iana.org/assignments/multicast-addresses

provides a list of assigned multicast addresses.

[mcanzano]

Thank you for the insight.

Regards,

Mike