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what is the reason for ISIS using the multicast MAC address in a LAN ?

the layer 2 switch can not distinguish the multicast and broadcast,the OSPF ,EIGRP and RIPv2 also use the multicast address,but IGMP snooping can not know who need receiving the multicast data

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Re: what is the reason for ISIS using the multicast MAC address

EIGRP, RIPv2, IS-IS, and OSPF all use different layer 3 multicast addresses, so they don't overlap. As for IGMP snooping, how would IGMP know which devices need to receive these multicasts, anyway--there's no IGMP join involved in routing protocol neighbor formation, so I don't know how snooping would relate?

:-)

Russ

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