multicast router
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... IP multicast datagrams is handled by
"multicast routers" which may be co-resident with, or separate from,
internet gateways ...
... IP
time-to-live greater than 1, the multicast router(s) attached to the
local network take responsibility for forwarding it towards all other
...
... internet host or gateway other than those acting as multicast
routers. The algorithms and protocols used within and between
multicast routers ...
... multicast
routers. The algorithms and protocols used within and between
multicast routers are transparent to hosts and will be specified in
separate documents. This memo also does not specify how local
...
... transmission. Only one interface is used for the initial
transmission; multicast routers are responsible for forwarding to any
other networks, if necessary. If the upper-layer ...
... hosts (or a
host and a multicast router), multicasts should be transmitted
exactly like unicasts ...
... IGMP protocol,
specified in Appendix I. IGMP is used to keep neighboring multicast
routers informed of the host group memberships present on a
...
... hosts group are recognized as a
special case by the multicast routers and are never forwarded beyond
a single network, regardless of their time-to-live ...
... host group memberships to any immediately-neighboring
multicast routers. IGMP is an asymmetric protocol and is specified
here from the point of view of a host ...
... IGMP is an asymmetric protocol and is specified
here from the point of view of a host, rather than a multicast
router. (IGMP may also be used, symmetrically or asymmetrically,
between multicast routers ...
... multicast
router. (IGMP may also be used, symmetrically or asymmetrically,
between multicast routers. Such use is not specified here.)
...
... host whose delay timer expires first.
Note that the multicast routers receive all IP multicast
datagrams ...
... hosts
and networks very low. However, when a multicast router starts up,
it may issue several closely-spaced Queries ...
... bound to a set of IP unicast addresses. The multicast routers do not
need to maintain a list of individual members of each host group ...
... host group.
For example, a multicast router attached to an Ethernet need
associate only a single Ethernet ...