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mrinfo - Displays configuration info from a multicast router
/usr/sbin/mrinfo [ -d debug_level ] [ -r retry_count ] [ -t time-
out_count ] multicast_router
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-
"-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:
packet warnings are printed to stderr.
all level 1 messages plus notifications down networks are
printed to stderr.
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.
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 -> 22.214.171.124 (momoney.com) [1/32/tunnel/down]
127.148.176.10 -> 126.96.36.199 (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.
mrinfo must be run as root.
mrouted(8), map-mbone(8), mtrace(8)
4.2 Berkeley Distribution MRINFO(8)