With ARP, each node broadcasts ARP requests on the entire link. This approach causes unnecessary
processing by uninterested nodes. With NDP, each node sends a request only to the intended destination
via a multicast address with the unicast address used as the last 24 bits. Other hosts on the link do not
participate in the process, greatly increasing network bandwidth efficiency.
Figure 54. NDP Router Redirect
IPv6 Neighbor Discovery of MTU Packets
You can set the MTU advertised through the RA packets to incoming routers, without altering the actual
MTU setting on the interface.
The ipv6 nd mtu command sets the value advertised to routers. It does not set the actual MTU rate. For
example, if you set
ipv6 nd mtu to 1280, the interface still passes 1500-byte packets, if that is what is
set with the mtu command.
Configuration Task List for IPv6 RDNSS
This section describes how to configure the IPv6 Recursive DNS Server.
This sections contains the following configuration task list for IPv6 RDNSS:
• Configuring the IPv6 Recursive DNS Server
• Debugging IPv6 RDNSS Information Sent to the Host
• Displaying IPv6 RDNSS Information
IPv6 Routing
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