Multicast has the function of sending the
same data to multiple devices. An IP host
uses the IGMP (Internet Group
Management Protocol ) to report
multicast group memberships to send data
to neighboring routers, and the multicast
router uses IGMP to discover which hosts
belong to the same multicast group.
This option allows you to export and then
save the router's configuration to a file on
your computer. Be sure to save the
configuration before performing a