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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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DHCPv6 Server Allocating Network Configuration Parameters to DHCPv6 Clients that Have IPv6 Addresses

DHCPv6 Server Allocating Network Configuration Parameters to DHCPv6 Clients that Have IPv6 Addresses

A DHCPv6 server allocates network configuration parameters to DHCPv6 clients that have IPv6 addresses in the following two situations:
  • The IPv6 address of a DHCPv6 client is automatically generated based on the Router Advertisement (RA) message. The DHCPv6 server allocates network configuration parameters excepting the IPv6 address to the DHCPv6 client.
  • After a DHCPv6 client obtains an IPv6 address using DHCPv6, network configuration parameters on the DHCPv6 server change. The DHCPv6 client needs to update network configuration parameters.

Working mechanisms in these two situations are the same. The following describes how a DHCPv6 server allocates network configuration parameters to DHCPv6 clients that have IPv6 addresses when no DHCPv6 relay agent exists on the network. If a DHCPv6 relay agent exists, the only difference is that the DHCPv6 relay agent processes DHCPv6 messages. For details, see DHCPv6 Server Allocating Addresses and Network Configuration Parameters to New Clients.

Figure 8-8 A DHCPv6 server allocates network configuration parameters to DHCPv6 clients that have IPv6 addresses

  1. A DHCPv6 client sends a multicast Information-request message with the Option Request option to DHCPv6 servers. The Option Request option specifies the configuration parameters that the DHCPv6 client needs to obtain from a DHCPv6 server.
  2. After a DHCPv6 server receives the Information-request message, the DHCPv6 server sends a unicast Reply message to the client. The Reply message carries the allocated network configuration parameters.
  3. The DHCPv6 client checks the allocated network configuration parameters in the Reply message. If the allocated network configuration parameters in the Reply message match those in the Information-request message, the DHCPv6 client performs network configuration based on the allocated network configuration parameters. Otherwise, the DHCPv6 client ignores the Reply message. If the DHCPv6 client receives multiple Reply messages, the client selects the first received Reply message and performs stateless configuration based on the parameters in this Reply message.
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Updated: 2019-05-08

Document ID: EDOC1100004354

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