From: Stanislav Sinyagin (SSinyagin@xxxxxx)
Date: Sat Dec 25 1999 - 09:38:34 GMT-3
CP> 2) I was thinking about multicast.. For instance the registration of a
CP> routing component to recieve 224.0.0.5 for OSPF.. I am supposing that the
CP> Unicast address for a specific interface is placed somewhere in memory and
CP> is that location is pointed to to respond to arp requests and such.. IS the
CP> multicast address treated precisely the same?
On broadcast media, like Ethernet ot TokenRing, the multicast packet
is sent to a specially formed MAC destination address, which is
recognized as multicast by other hosts and routers.
See, for example, Designing Internetworks for Multimedia from Design
guide on CiscoCD.
On NBMA, like X.25 or FR, when the router needs to send a multicast
packet out an interface or subinterface, it sends it out all the VCs
mapped as "broadcast" (frame-relay map ip x.x.x.x DLCI# broadcast).
On point-to-point interface, there's no choice except to send the
packet to the other side :)
When configuring OSPF or EIGRP, you specify by "network" and "passive
interface" the interfaces to which you send the multicast hellos.
Stan
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