Ipv6 Neighbor Discovery; Ipv6 Neighbor Discovery Of Mtu Packets; Configuring The Ipv6 Recursive Dns Server - Dell S6100 Configuration Manual

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IPv6 Neighbor Discovery

The IPv6 neighbor discovery protocol (NDP) is a top-level protocol for neighbor discovery on an IPv6 network.

In place of address resolution protocol (ARP), NDP uses "Neighbor Solicitation" and "Neighbor Advertisement" ICMPv6 messages for

determining relationships between neighboring nodes. Using these messages, an IPv6 device learns the link-layer addresses for neighbors

known to reside on attached links, quickly purging cached values that become invalid.

If a neighboring node does not have an IPv6 address assigned, it must be manually pinged to allow the IPv6 device to

determine the relationship of the neighboring node.

To avoid problems with network discovery, Dell Networking recommends configuring the static route last or assigning an

IPv6 address to the interface and assigning an address to the peer (the forwarding router's address) less than 10 seconds apart.

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 58. NDP Router Redirect

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.

You can configure up to four Recursive DNS Server (RDNSS) addresses to be distributed via IPv6 router advertisements to an IPv6 device,

using the ipv6 nd dns-server ipv6-RDNSS-address {lifetime | infinite} command in INTERFACE CONFIG mode.

IPv6 Routing