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