MRINFO(8)

NAME
mrinfo - Displays configuration info from a multicast router

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

DESCRIPTION
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 multicast router responds, the configuration is displayed to the standard 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 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" 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 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.

IMPORTANT NOTE
mrinfo must be run as root.

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

AUTHOR
Van Jacobson