Neighbor Discovery Protocol (Ndp) - Dell S6100 Configuration Manual

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The neighbor discovery protocol for IPv6 is defined in RFC 2461 as part of the Stateless Address Autoconfiguration protocol. It replaces the

Address Resolution Protocol used with IPv4. NDP defines mechanisms for solving the following problems:

Router discovery — hosts can locate routers residing on a link

Prefix discovery — hosts can discover address prefixes for the link

Parameter discovery

Address autoconfiguration — configuration of addresses for an interface

Address resolution — mapping from IP address to link-layer address

Next-hop determination

Neighbor unreachability detection (NUD) — determine that a neighbor is no longer reachable on the link.

Duplicate address detection (DAD) — allow a node to check whether a proposed address is already in use.

Redirect — the router can inform a node about a better first-hop.

NDP uses the following five ICMPv6 packet types in its implementation:

Router Solicitation

Router Advertisement

Neighbor Solicitation

Neighbor Advertisement

IPv6 Router Advertisement (RA) Guard

The IPv6 RA guard provides support to perform conditional forwarding or blocking of the router advertisement messages that are received

at the network device platform. This functionality analyzes and filters the RAs sent by the devices and compares the configuration

information on the layer 2 device with the RA frame. Once the layer 2 device validates the content of the RA frame against the

configuration, it forwards the RA to its unicast or multicast destination. On failure to validate the RA frame content, the RA frame is

The IPv6 RA guard supports two different modes:

Host mode — When a policy with device role as host is applied on an interface, all the RA packets are dropped without validation. You

can also configure the host mode policy with VLAN option to drop the RA packets on that specific VLAN and port.

Router mode — When a policy with device role as router is applied on an interface, all the RA packets are validated based on the

configuration information in the policy. Similarly, you can also apply this mode over any specific VLAN and the validation is performed

only for that particular VLAN RA packets.

To configure the IPv6 RA guard, use the following Dell Networking OS commands.

Neighbor Discovery Protocol (NDP)

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