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 mul-
     ticast  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 mes-
     sages 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 follow-
     ing 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 retry.

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

     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 con-
     nection), the treashold (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.

     mrinfo must be run as root.

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

     Van Jacobson