Ccie exam dumps DHCPv6 technology overview
Dynamic Host Configuration Protocol (DHCP) was designed to handle the assignment of IP addresses and other network information to computers so that computers can communicate automatically over the network. DHCPv6 (Dynamic Host Configuration Protocol for IPv6) is a protocol designed for IPv6 addressing schemes that assigns IPv6 prefixes, IPv6 addresses, and other network configuration parameters to hosts
Compared with other IPv6 address allocation methods (manual configuration, stateless autoconfiguration through network prefix in router advertisement messages, etc.), DHCPv6 has the following advantages:
1. Not only can IPv6 addresses be assigned, but also IPv6 prefixes can be assigned to facilitate automatic configuration and management of the entire network.ccie exam dumps
2. Better control over the allocation of addresses. Through DHCPv6, not only can the address/prefix assigned to the host be recorded, but also a specific address/prefix can be assigned to a specific host for network management.
3. In addition to the IPv6 prefix and IPv6 address, you can also assign network configuration parameters such as DNS server and domain name to the host.
The DHCPv6 basic protocol architecture mainly includes the following three roles:
l DHCPv6 Client：
The DHCPv6 client interacts with the DHCPv6 server to obtain the IPv6 address/prefix and network configuration information and complete its own address configuration.
l DHCPv6 Relay：
The DHCPv6 relay agent is responsible for forwarding DHCPv6 messages from the client or the server to assist the DHCPv6 client and DHCPv6 server in completing address configuration. In general, a DHCPv6 client communicates with a DHCPv6 server through a link-local multicast address to obtain an IPv6 address/prefix and other network configuration parameters. Ccie exam dumps If the server and the client are not in the same link range, the DHCPv6 relay agent needs to forward packets. This prevents the DHCPv6 server from being deployed on each link. This saves costs and facilitates centralized management.
In the DHCPv6 basic protocol architecture, the DHCPv6 relay agent is not a required role. Ccie exam dumps If the DHCPv6 client and the DHCPv6 server are in the same link range, or the DHCPv6 client and the DHCPv6 server directly perform address allocation or information configuration through unicast interaction, the DHCPv6 relay agent is not required to participate. Ccie exam dumps The DHCPv6 relay agent is required to participate only when the DHCPv6 client and the DHCPv6 server are not in the same link range, or the DHCPv6 client and the DHCPv6 server cannot communicate unicast.
l DHCPv6 Server：
The DHCPv6 server is responsible for processing address allocation, address renewal, and address release requests from clients or relay agents, and assigns IPv6 addresses/prefixes and other network configuration information to clients.
DHCPv6 address/prefix allocation process
The process of assigning addresses/prefixes to clients by the DHCPv6 server is divided into two categories:
1. The process of quickly assigning two messages to each other
2. The process of assigning four messages to each other
The process of quickly assigning two messages:
(1) The DHCPv6 client carries the Rapid Commit option in the sent Solicit message, and identifies that the client wants the server to quickly assign an address/prefix and network configuration parameters to it;
(2) If the DHCPv6 server supports the fast allocation process, it directly returns a Reply message to assign the IPv6 address/prefix and other network configuration parameters to the client. If the DHCPv6 server does not support the fast allocation process, the IPv4 address/prefix and other network configuration parameters are assigned to the client by the process of assigning four messages.
The process of assigning four messages to each other:
(1) Solicit: The DHCPv6 client sends the message and requests the DHCPv6 server to assign an IPv6 address/prefix and network configuration parameters to it.
(2) Advertis: If the Solicit message does not carry the Rapid Commit option, or the Solicit message carries the Rapid Commit option, but the server does not support the fast allocation process, the DHCPv6 server replies to the message,notifies the client of the address/prefix and network configuration parameters that can be assigned to it.
(3) Request: If the DHCPv6 client receives the Advertise message replied by multiple servers, select one of the servers according to the order of receiving the message, the server priority, etc., and send a Request message to the server, requesting the server to confirm It assigns an address/prefix and network configuration parameters.
(4) Reply: The DHCPv6 server replies to the message and confirms that the address/prefix and network configuration parameters are assigned to the client for use.
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Ccie exam dumps DHCPv6 technology overview
2. Better control over the allocation of addresses. Through DHCPv6, not only can the address/prefix assigned to the host be recorded, but also a specific address/prefix can be assigned to a specific host for network management.
3. In addition to the IPv6 prefix and IPv6 address, you can also assign network configuration parameters such as DNS server and domain name to the host.
The DHCPv6 basic protocol architecture mainly includes the following three roles:
l DHCPv6 Client：
The DHCPv6 client interacts with the DHCPv6 server to obtain the IPv6 address/prefix and network configuration information and complete its own address configuration.
l DHCPv6 Relay：
The DHCPv6 relay agent is responsible for forwarding DHCPv6 messages from the client or the server to assist the DHCPv6 client and DHCPv6 server in completing address configuration. In general, a DHCPv6 client communicates with a DHCPv6 server through a link-local multicast address to obtain an IPv6 address/prefix and other network configuration parameters. Ccie exam dumps If the server and the client are not in the same link range, the DHCPv6 relay agent needs to forward packets. This prevents the DHCPv6 server from being deployed on each link. This saves costs and facilitates centralized management.
In the DHCPv6 basic protocol architecture, the DHCPv6 relay agent is not a required role. Ccie exam dumps If the DHCPv6 client and the DHCPv6 server are in the same link range, or the DHCPv6 client and the DHCPv6 server directly perform address allocation or information configuration through unicast interaction, the DHCPv6 relay agent is not required to participate. Ccie exam dumps The DHCPv6 relay agent is required to participate only when the DHCPv6 client and the DHCPv6 server are not in the same link range, or the DHCPv6 client and the DHCPv6 server cannot communicate unicast.
l DHCPv6 Server：
The DHCPv6 server is responsible for processing address allocation, address renewal, and address release requests from clients or relay agents, and assigns IPv6 addresses/prefixes and other network configuration information to clients.
DHCPv6 address/prefix allocation process
The process of assigning addresses/prefixes to clients by the DHCPv6 server is divided into two categories:
1. The process of quickly assigning two messages to each other
2. The process of assigning four messages to each other
The process of quickly assigning two messages:
(1) The DHCPv6 client carries the Rapid Commit option in the sent Solicit message, and identifies that the client wants the server to quickly assign an address/prefix and network configuration parameters to it;
(2) If the DHCPv6 server supports the fast allocation process, it directly returns a Reply message to assign the IPv6 address/prefix and other network configuration parameters to the client. If the DHCPv6 server does not support the fast allocation process, the IPv4 address/prefix and other network configuration parameters are assigned to the client by the process of assigning four messages.
The process of assigning four messages to each other:
(1) Solicit: The DHCPv6 client sends the message and requests the DHCPv6 server to assign an IPv6 address/prefix and network configuration parameters to it.
(2) Advertis: If the Solicit message does not carry the Rapid Commit option, or the Solicit message carries the Rapid Commit option, but the server does not support the fast allocation process, the DHCPv6 server replies to the message,notifies the client of the address/prefix and network configuration parameters that can be assigned to it.
(3) Request: If the DHCPv6 client receives the Advertise message replied by multiple servers, select one of the servers according to the order of receiving the message, the server priority, etc., and send a Request message to the server, requesting the server to confirm It assigns an address/prefix and network configuration parameters.
(4) Reply: The DHCPv6 server replies to the message and confirms that the address/prefix and network configuration parameters are assigned to the client for use.
Publisher:IE LAB
publish Website: http://ielab.network
WhatsApp: +8617782638871
Skype:live:ielab.anna
Ccie exam dumps DHCPv6 technology overview
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