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CCNP Routing and Switching ROUTE 300-101 Official Cert Guide, Video Enhanced Edition by Kevin Wallace

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Layer 2 Addressing Mapping and Duplicate Address Detection

As with IPv4, any device running IPv6 needs to determine the data link layer address used by devices on the same link. IPv4 uses Address Resolution Protocol (ARP) on LANs and Inverse ARP (InARP) on Frame Relay. IPv6 defines a couple of new protocols that perform the same function. These new functions use ICMPv6 messages and avoid the use of broadcasts, in keeping with IPv6’s avoidance of broadcasts. This section gives a brief explanation of each protocol.

Neighbor Discovery Protocol for Layer 2 Mapping

When an IPv6 host or router needs to send a packet to another host or router on the same LAN, the host/router first looks in its neighbor database. This database contains a list of all ...

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