mrinfo (8)

Name

mrinfo - display configuration info from a multicast router

Synopsis

mrinfo [-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 multicast
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. Nonzero 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 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 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.