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What is NDP IPv6?
Neighbor Discovery Protocol (NDP, defined in RFC 4861) is an important protocol in IPv6. Neighbor Discovery Protocol (NDP) is based on ICMPv6 and is used to identify the relationships between different neighboring devices in an IPv6 network.
Which NDP message type is used by an IPv6 router to advertise its presence along with various link information?
NDP uses five message types: Router Solicitation-The Router Solicitation message is sent by IPv6 hosts to discover the presence of IPv6 routers on the link. Neighbor Solicitation – IPv6 nodes send the Neighbor Solicitation message to discover the link-layer address of an IPv6 node on-link.
What is IPv6 ND prefix?
ipv6-prefix: IPv6 address prefix. no-autoconfig: Specifies a prefix not to be used for stateless autoconfiguration. If this keyword is not provided, the prefix is used for stateless autoconfiguration. off-link: Indicates that the address with the prefix is not directly reachable on the link.
What is the purpose of this command no IPv6 nd other config flag?
Configures the hosts can use stateful autoconfiguration to get non-IPv6-address information.
How does IPv6 NDP work?
The IPv6 neighbor discovery process uses Internet Control Message Protocol (ICMP) messages and solicited-node multicast addresses to determine the link-layer address of a neighbor on the same network (local link), verify the reachability of a neighbor, and track neighboring devices.
What is router advertisement messages for IPv6?
The RADVD (Router Advertisement Daemon) is used for IPv6 auto-configuration and routing. When enabled, messages are sent by the router periodically and in response to solicitations. A host uses the information to learn the prefixes and parameters for the local network.
What are the five 5 types of Neighbor Discovery messages?
Neighbor Discovery message types. ND uses five different types of messages to perform all its functions. These messages are Router Advertisement, Router Solicitation, Neighbor Solicitation, Neighbor Advertisement, and Redirect.
Does IPv6 use ARP?
In IPv6, the Address Resolution Protocol (ARP) has been replaced by the Neighbor Discovery Protocol (NDP). The IPv4 command show arp is replaced by the IPv6 command show ipv6 neighbors . The key pieces of information displayed by this command are the IP address, the MAC (Link Layer) address, and the interface.
How does a Cisco router choose which route to use?
One of the intriguing aspects of Cisco routers, especially for those new to routing, is how the router chooses which route is the best among those presented by routing protocols, manual configuration, and various other means.
Why does my router not send Ra messages?
As result, the router doesn’t send its periodical Router Advertisements , but when the host is restarted, it sends a Router Solicitation message and the Router answers with Router Advertisement (that is making me crazy, because I understand it musn’t send RA messages with suppres command configured)
What happens when a Cisco router fails to install?
If there’s already a route to this same destination in the routing table, the installation attempt fails. For protocols that have their own database of routing information, such as EIGRP, IS-IS, OSPF, BGP, and RIP, a backup route is registered when the initial attempt to install the route fails.
When to use administrative distance in routing protocol?
If a router learns about a destination from more than one routing protocol, administrative distance is compared and the preference is given to the routes with lower administrative distance. In other words, it is the believability of the source of the route.