Updated: 2022/Sep/29

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

       mrinfo - Displays configuration info from a multicast router

       /usr/sbin/mrinfo [ -d debug_level ] [ -r retry_count ] [ -t
       timeout_count ] multicast_router

       mrinfo attempts to display the configuration information from the
       multicast router multicast_router.

       mrinfo uses the ASK_NEIGHBORS IGMP message to the specified multicast
       router. If this multicast router responds, the version number and a
       list of their neighboring multicast router addresses is part of that
       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.

       "-d" option sets the debug level. When the debug level is greater than
       the default value of 0, addition debugging messages are printed.
       Regardless of the debug level, an error condition, will always write an
       error message and will cause mrinfo to terminate.  Non-zero debug
       levels have the following effects:

       level 1
              packet warnings are printed to stderr.

       level 2
              all level 1 messages plus notifications down networks are
              printed to stderr.

       level 3
              all level 2 messages plus notifications of all packet timeouts
              are printed to stderr.

       "-r retry_count" sets the neighbor query retry limit. Default is 3

       "-t timeout_count" sets the number of seconds to wait for a neighbor
       query reply. Default timeout is 4 seconds.

       mrinfo mbone.phony.dom.net (mbone.phony.dom.net) [version 3.3]: -> (?) [1/1/querier] -> (mbone2.phony.dom.net) [1/45/tunnel] -> (momoney.com) [1/32/tunnel/down] -> (mbone.dipu.edu) [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), the
       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 connection is displayed.

       mrinfo must be run as root.

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

       Van Jacobson

4.2 Berkeley Distribution                                            MRINFO(8)