There are three routing tables associated with mrouted. They are the Virtual Interface Table,
the Multicast Routing Table, and the Multicast
Routing Cache Table.
The Virtual Interface Table displays topological information
for both physical and tunnel interfaces, the number of incoming
and outgoing packets at each interface, and the value of specific
configuration parameters, such as metric and threshold, for each virtual interface (vif).
The Multicast Routing Table displays connectivity information
for each subnet from which a multicast datagram can originate.
The Multicast Routing Cache Table maintained by mrouted is a copy of the kernel forwarding cache table.
It contains status information for multicast destination group-origin
subnet pairs.
These tables are retrieved by sending the appropriate signal
to the mrouted daemon. For retrieving routing tables, mrouted responds to the following signals:
- HUP
Restarts mrouted. The configuration file is reread each time this
signal is evoked.
- INT
Terminates mrouted gracefully, by sending good-bye messages to all
neighboring routers.
- TERM
The same as INT.
- USR1
Defined as signal 16, dumps the internal routing
tables (Virtual Interface Table and Multicast Routing Table) to /usr/tmp/mrouted.dump.
- USR2
Defined as signal 17, dumps the Multicast Routing Cache
Tables to /usr/tmp/mrouted.cache.
- QUIT
Dumps the internal routing tables (Virtual Interface Table
and Multicast Routing Table) to stderr (only if mrouted was invoked with a non-zero debug level).
Signals can be sent to mrouted by issuing the HP-UX kill command at the HP-UX prompt. For example:
where pid is the process ID of the mrouted daemon.
Refer to the "Example" section of the mrouted (1m) man pages for an explanation of the contents of the mrouted routing tables.
Refer to the "Signals" section of the mrouted (1m) man pages for additional information about other signals
to which mrouted responds.
