As a CCNA/CCNP prospect you are anticipated to understand IPv6

Throughout your profession as a Cisco community engineer you will have to deal comprehending IPv6 handle construction.

For your CCNA and CCNP studies you have to at some level confront and recognize IPv6. At first look it can see quite challenging in contrast to IPv4 that we are all utilised to, in genuine fact IPv6 is quite a basically addressing protocol after you get previous the initial shock. In this write-up we are likely to have a look at Neighbour discovery protocol for layer 2 mapping.

When an IPv6 host or router wants to deliver a packet to some other host on the very same community it will initial of all seem into it truly is possess local neighbour database to discover if it has an IPv6 to MAC mapping, if it finds the correct mapping the host will use it, if there is no mapping the host will require to take care of the known layer three IPv6 handle to a at the moment unidentified Layer two MAC address and to do this the host utilizes the Neighbor Discovery Protocol or NDP to uncover the MAC tackle dynamically.


The Sending host will use a multicast information called a Neighbor Solicitation (NS) icmp information to request the obtaining host for it really is MAC address, the obtaining host will reply with a Neighbor Advertisement (NA) icmp information unicast in return with the asked for MAC address.

How IPv6 achieves this is all in the construction of the Neighbor Solicitation message which tends to make use of a specific IPv6 destination handle known as a "Solicited Node Multicast", this solicited Node Multicast at any offered instant represented all of the IPv6 hosts on the url, the very last 24 bits of the Solicited Node Deal with are the very last 24 bits of the IPv6 deal with of the unit that a host is requesting the MAC from.

ccnp training london is FF02::1:FF:/104 the final 24 bits are manufactured up of the very last 24 bits of the IPv6 address to which the concept is currently being sent to. For instance if a host needed to learn the MAC handle of an IPv6 host resolved as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four then the solicited Node Tackle will seem like the subsequent FF02::one:FF:CC:DDDD/104

When a sending hosts would like to get the MAC address from the IPv6 host of 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four it will just take the last 24 bits of the identified IPv6 tackle and area them into the remaining 24 bits of the Solicited Node Tackle and given that all IPv6 hosts listen to their possess Solicited Node addresses, when they listen to their deal with they will reply with the MAC deal with.