配置IPv6 DHCP：Cisco网络设备指南 - CSDN文库

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"CISCO官方配置手册IPV6-DHCP.pdf" 本文档是Cisco公司关于“Implementing DHCP for IPv6”的官方配置指南，主要讲解如何在网络设备上配置IPv6的动态主机配置协议（DHCP）以实现前缀委托。这份手册涵盖了多种定义通用前缀的方法，包括手动设置、基于6to4接口以及通过DHCPv6前缀委托客户端动态获取前缀。 DHCPv6是IPv6环境中的一个重要组件，它允许网络设备自动获取IP地址和其他网络配置参数，如DNS服务器地址、默认网关等。对于IPv6，由于地址空间的巨大，手动配置每个设备的IP地址变得不切实际，因此DHCPv6服务显得尤为重要。前缀委托是DHCPv6的一个特性，它使得网络设备能够从DHCPv6服务器获得一个或多个IPv6前缀，用于分配给子网内的其他设备。本手册中详细介绍了配置DHCPv6前缀委托的过程，这可能涉及到以下步骤： 1. 配置DHCPv6服务器：在Cisco IOS软件支持的路由器或交换机上启用和配置DHCPv6服务。 2. 定义前缀池：创建包含可分配IPv6前缀的池，这些前缀可以是手动配置的，也可以是动态从上级DHCPv6服务器获取的。 3. 配置客户端：在需要自动配置的设备上启用DHCPv6客户端，并设置必要的选项以接收前缀委托。 4. 委托管理：设置规则和策略，确保前缀的正确分配和管理，防止冲突。此外，手册还提供了关于如何查找特定功能信息的指导，读者可以在“Feature Information for Implementing DHCP for IPv6”章节找到各版本Cisco IOS软件对特定功能的支持情况。同时，为了帮助用户确定其网络设备和Cisco IOS及Catalyst OS软件镜像的兼容性，文档还提到了Cisco Feature Navigator工具，这是一个在线资源，用于查找平台支持信息和软件版本详细信息。这份“Implementing DHCP for IPv6”模块为网络管理员提供了一份全面的指南，帮助他们在Cisco网络环境中成功实施和管理IPv6的DHCP服务，确保网络设备能够自动获取必要的网络配置，从而简化网络部署和维护工作。

Implementing DHCP for IPv6

Information About Implementing DHCP for IPv6

25

Implementing IPv6 for Cisco IOS Software

The Cisco IOS DHCP for IPv6 server can assign prefixes dynamically from an IPv6 local prefix pool.

When the server receives a prefix request from a client, it attempts to obtain unassigned prefixes from

the pool. After the client releases the previously assigned prefixes, the server returns them to the pool

for reassignment.

An IPv6 prefix delegating router can also select prefixes for a requesting router based on an external

authority such as a RADIUS server using the Framed-IPv6-Prefix attribute. For more information on this

feature, see the Implementing ADSL and Deploying Dial Access for IPv6 module.

Automatic Binding

Each DHCP for IPv6 configuration pool has an associated binding table. The binding table contains the

records about all the prefixes in the configuration pool that have been explicitly delegated to clients.

Each entry in the binding table contains the following information:

• Client DUID

• Client IPv6 address

• A list of IAPDs associated with the client

• A list of prefixes delegated to each IAPD

• Preferred and valid lifetimes for each prefix

• The configuration pool to which this binding table belongs

• The network interface on which the server that is using the pool is running

A binding table entry is automatically created whenever a prefix is delegated to a client from the

configuration pool, and it is updated when the client renews, rebinds, or confirms the prefix delegation.

A binding table entry is deleted when the client releases all the prefixes in the binding voluntarily, all

prefixes' valid lifetimes have expired, or administrators run the clear ipv6 dhcp binding command.

Binding Database

The automatic bindings are maintained in RAM and can be saved to some permanent storage so that the

information about configuration such as prefixes assigned to clients is not lost after a system reload or

power down. The bindings are stored as text records for easy maintenance. Each record contains the

following information:

• DHCP for IPv6 pool name from which the configuration was assigned to the client

• Interface identifier from which the client requests were received

• The client IPv6 address

• The client DUID

• IAID of the IAPD

• Prefix delegated to the client

• The prefix length

• The prefix preferred lifetime in seconds

• The prefix valid lifetime in seconds

• The prefix expiration time stamp

• Optional local prefix pool name from which the prefix was assigned

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