Mapping class D to Ethernet physical address
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Posted by Albert Manfredi on June 12, 2008, 10:25 am
Please log in for more thread options What entries? Take a normal, non-snooping L2 switch. A MAC frame with multicast MAC DA arrives at the switch. The default behavior is what? It is to flood that multicast frame to all active ports. No tables needed. What node created that MAC multicast DA to begin with? It was the host that originally transmitted the frame. If that host was sending out multicast IP packets, *it* would be the box that maps the IP Class D to the appropriate MAC multicast DA. Does the L2 switch know anything about the IP DA, assuming the MAC frame is carrying IP? No, because I said at the top that this was a normal, non-snooping L2 switch. It knows nothing about Layer 3. So are there any multicast table entries at all? Only if the switch does either IGMP snooping, or GMRP. If the L2 switch does IGMP snooping, then read RFC 4541 to see about timeout timers. Bert | ||||||||||||||||
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> multicast table is what , either it static or dynamic.