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MRINFO(8)		    System Manager's Manual		     MRINFO(8)

     mrinfo -- displays	configuration info from	a multicast router

     mrinfo [-hn] [-d level] [-r count]	[-t seconds] router

     mrinfo attempts to	display	the configuration information from the speci-
     fied multicast capable router.

     mrinfo uses the ASK_NEIGHBORS IGMP	message	to query the specified multi-
     cast router.  If the router responds, the version number and a list of
     their neighboring multicast router	addresses is part of the response.  If
     the responding router has a recent	multicast version number, then mrinfo
     requests additional information such as metrics, thresholds, and flags
     from the multicast	router.	 Once the specified multicast router responds,
     the configuration is displayed to the standard output.

     The options are as	follows:

     -h		       Print a help message and	exit.

     -n		       Use numerical address instead of	a symbolic host	name.

     -d	level	       sets the	debug level.  When the debug level is greater
		       than the	default	value of 0, additional debugging mes-
		       sages are printed.  Regardless of the debug level, an
		       error condition will always write an error message and
		       cause mrinfo to terminate.  Non-zero debug levels have
		       the following effects (printed to stderr):

			     1	packet warnings.
			     2	all level 1 messages plus notifications	of
				down networks.
			     3	all level 2 messages plus notifications	of all
				packet timeouts.

     -r	count	       sets the	neighbor query retry count limit.  The default
		       is to do	3 retries.

     -t	seconds	       sets the	timeout	in number of seconds to	wait for a
		       neighbor	query reply.  The default timeout is 4 sec-

     # mrinfo ( [version 3.3]: ->	(?) [1/1/querier] -> ( [1/45/tunnel] -> ( [1/32/tunnel/down] ->	( [1/32/tunnel]

     For each neighbor of the queried multicast	router,	the IP of the queried
     router is displayed, followed by the IP and name of the neighbor.	In
     square brackets the metric	(cost of connection) and threshold (multicast
     ttl) is displayed.	 If the	queried	multicast router has a newer version
     number, the type (tunnel, srcrt) and status (disabled, down) of the con-
     nection is	displayed.

     map-mbone(8), mrouted(8), mtrace(8)

     Van Jacobson

FreeBSD	13.0			 May 31, 2007			  FreeBSD 13.0


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