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MRINFO(8) System Manager's Manual MRINFO(8) NAME mrinfo - Displays configuration info from a multicast router SYNOPSIS /usr/sbin/mrinfo [ -d debug_level ] [ -r retry_count ] [ -t time- out_count ] multicast_router DESCRIPTION mrinfo attempts to display the configuration information from the mul- ticast 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 num- ber, 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 stan- dard 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. Re- gardless of the debug level, an error condition, will always write an error message and will cause mrinfo to terminate. Non-zero debug lev- els 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 neigh- bor. 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 4.2 Berkeley Distribution MRINFO(8)