mrinfo - Displays configuration information from a multicast router
/usr/sbin/mrinfo [-d debug_level] [-r retry_count] [-t timeout_count]
-d Sets the debug level. When the debug level is greater than 0 (the
default), additional debugging messages are printed. Regardless of the
debug level, if an error condition occurs, mrinfo writes an error mes-
sage and terminates. Nonzero debug levels have the following effects:
1 Prints packet warnings to stderr.
2 Prints all level 1 messages and notifications of down networks to
3 Prints all level 2 messages and notifications of all packet
timeouts to stderr.
Specifies the number of times to retry a neighbor query. The default
is 3 retries.
Specifies the number of seconds to wait for a neighbor to reply to a
query. The default timeout is 4 seconds.
The mrinfo command displays the configuration information from the multi-
cast router multicast_router.
The mrinfo command sends the ASK_NEIGHBORS IGMP message to the specified
multicast router. If the multicast router responds, the response includes
the version number and a list of addresses for their neighboring multicast
routers. If the responding router has a recent multicast version number,
mrinfo requests additional information such as metrics, thresholds, and
options from the multicast router. Once the specified multicast router
responds, the configuration is displayed to the standard output.
You must be superuser in order to run mrinfo.
The following example shows the output of the mrinfo command where
mbone.phony.dom.net is specified as the multicast router:
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 address of the
queried router is displayed, followed by the IP address and name of the
neighbor. In square brackets, the metric (cost of connection) and the
threshold (multicast ttl) are displayed. If the queried multicast router
has a newer version number, the type (tunnel, srcrt) and status (disabled,
down) of the connection are displayed.
Commands: map-mbone(8), mrouted(8), mtrace(8)