displays configuration info from a multicast
attempts to display the configuration
information from the specified multicast capable
uses the ASK_NEIGHBORS IGMP message to query
the specified multicast router. If the router responds, the version number and
a list of their neighboring multicast router addresses is part of the
response. If the responding router has a recent multicast version number, then
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
The options are as follows:
- Print a help message and exit.
- Use numerical address instead of a symbolic host name.
- sets the debug level. When the debug level is greater than
the default value of 0, additional debugging messages are printed.
Regardless of the debug level, an error condition will always write an
error message and cause mrinfo to terminate.
Non-zero debug levels have the following effects (printed to stderr):
- packet warnings.
- all level 1 messages plus notifications of down
- all level 2 messages plus notifications of all packet
- sets the neighbor query retry count limit. The default is
to do 3 retries.
- sets the timeout in number of seconds to wait for a
neighbor query reply. The default timeout is 4 seconds.
# 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 -> 184.108.40.206 (momoney.com) [1/32/tunnel/down]
127.148.176.10 -> 220.127.116.11 (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) and 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.