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Description of problem:
due to
https://bugzilla.redhat.com/show_bug.cgi?id=574461
new features supporting multicast was added into bridge.
But I found that there is no documatation for 
brctl command in man pages for multicast operation, short set bellow.
So I was unable to use brctl properly with multicast.

Version-Release number of selected component (if applicable):
bridge-utils-1.2-9.el6

for example these
	setmclmc  	<bridge> <int>		set multicast last member count
	setmcrouter	<bridge> <int>		set multicast router
	setmcsnoop	<bridge> <int>		set multicast snooping
	setmcsqc  	<bridge> <int>		set multicast startup query count
	setmclmi  	<bridge> <time>		set multicast last member interval
	setmcmi   	<bridge> <time>		set multicast membership interval
	setmcqpi  	<bridge> <time>		set multicast querier interval
	setmcqi   	<bridge> <time>		set multicast query interval
	setmcqri  	<bridge> <time>		set multicast query response interval
	setmcqri  	<bridge> <time>		set multicast startup query interval

This feature request did not get resolved in time for Feature Freeze
for the current Red Hat Enterprise Linux release and has now been
denied. It has been proposed for the next Red Hat Enterprise Linux
release. If you would still like it considered for the current
release as an exception, please make that request with your support
representative.

Created attachment 519443 [details]
man page for brctl providing missing ICMP multicast options.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
With this update, the new multicast feature is now described in the brctl(8) manual page.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1571.html