mrinfo - Displays configuration information from a multicast router
/usr/sbin/mrinfo [-d debug_level] [-r retry_count]
[-t timeout_count] multicast_router
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 message and terminates. Nonzero debug levels have the following effects: Prints packet warnings to stderr. Prints all level 1 messages and notifications of down networks to stderr. 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 multicast 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 flags 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 -> 220.127.116.11 (momoney.com) [1/32/tunnel/down]
127.148.176.10 -> 18.104.22.168 (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).
Networking: mbone.info(7). delim off