MRINFO(8) BSD System Manager's Manual MRINFO(8)NAMEmrinfo — display configuration info from a multicast router
SYNOPSISmrinfo [-d debug_level] [-r retry_count] [-t timeout_count]
multicast_router
DESCRIPTION
The mrinfo utility attempts to display the configuration information from
the multicast router multicast_router.
The mrinfo utility 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.
The following options are available:
-d debug_level
Set 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
Set the neighbor query retry limit. Default is 3 retries.
-t timeout_count
Set the number of seconds to wait for a neighbor query reply.
Default timeout is 4 seconds.
SAMPLE OUTPUTmrinfo 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 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 con‐
nection is displayed.
IMPORTANT NOTE
The mrinfo utility must be run as root.
SEE ALSOmap-mbone(8), mrouted(8), mtrace(8)AUTHORS
Van Jacobson
BSD May 8, 1995 BSD
