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Local Area High Speed Networks by Dr. Sidnie Feit

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Summary Points

  • It is a good idea to protect the bandwidth available within a collision domain by blocking off multicast traffic that is not addressed to a station in that domain.

  • It is more difficult to block off multicast traffic than to block off unicast traffic.

  • IP multicast addresses are mapped into Ethernet or FDDI MAC ddresses. The first 25 bits of the MAC address hold a fixed-bit pattern. The last 23 bits of the MAC address are copied from the last 23 bits of the multicast IP address.

  • IGMP snooping is one method used to discover which parts of a LAN need to receive multicasts sent to a particular group.

  • To perform IGMP snooping, bridges eavesdrop on the IGMP messages that stations use to join and leave multicast groups.

  • IGMP snooping is CPU-intensive. ...

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