MRINFO(8)                                                            MRINFO(8)



NAME
       mrinfo - Displays configuration info from a multicast router

SYNOPSIS
       /usr/sbin/mrinfo  [  -d  debug_level  ]  [  -r retry_count ] [ -t time-
       out_count ] multicast_router


DESCRIPTION
       mrinfo attempts to display the configuration information from the  mul-
       ticast 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  num-
       ber,  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 stan-
       dard output.

INVOCATION
       "-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 lev-
       els 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
       retry.

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


SAMPLE OUTPUT
       mrinfo mbone.phony.dom.net
       127.148.176.10 (mbone.phony.dom.net) [version 3.3]:
        127.148.176.10 -> 0.0.0.0 (?) [1/1/querier]
        127.148.176.10 -> 127.0.8.4 (mbone2.phony.dom.net) [1/45/tunnel]
        127.148.176.10 -> 105.1.41.9 (momoney.com) [1/32/tunnel/down]
        127.148.176.10 -> 143.192.152.119 (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 neigh-
       bor. 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.


IMPORTANT NOTE
       mrinfo must be run as root.


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


AUTHOR
       Van Jacobson



4.2 Berkeley Distribution                                            MRINFO(8)
