Router Prefix Segmentation for Cascaded IPv6 Networks
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Solution Overview
Problem
In IPv6 networks, cascaded routers often lack the necessary IP address allocation to connect devices due to limited server delegate prefixes from broadband access servers, preventing devices connected to cascaded routers from obtaining IP addresses.
Innovation Solution
A method and router configuration that allows routers to receive a delegate prefix from an upper-level network device, generate local and delegate prefixes, and send them to lower-level routers, enabling IP address determination for WAN and LAN interfaces, even in cascaded networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ingress router obtains only one server delegate prefix from the BAS, then the configuration is simple, but devices connected to cascaded routers cannot obtain IP addresses
Solution Approach 1:
The patent segments the delegate prefix into multiple parts: the ingress router receives a server delegate prefix from the BAS, generates its own local prefix and delegate prefix, then distributes the delegate prefix to cascaded routers. This segmentation allows each router in the cascade to obtain necessary prefix information independently, enabling IP address allocation throughout the cascaded network while maintaining simple initial configuration at the ingress router.
2Adaptability or versatility
If multiple routers are connected in cascade to serve multiple terminals, then network coverage is expanded, but the limited server delegate prefix prevents IP address allocation to cascaded router devices
Solution Approach 1:
The patent implements a nested prefix structure where the BAS provides a server delegate prefix to the ingress router, which then generates and embeds its own delegate prefix within the cascaded network structure. Cascaded routers receive and further distribute this nested prefix information, allowing each level of the cascade to have sufficient prefix information for IP address allocation while maintaining the hierarchical network expansion capability.
3Reliability
If the router generates and distributes local and delegate prefixes to lower-level routers, then IP address allocation is enabled in cascaded networks, but the processing complexity increases
Solution Approach 1:
The patent applies preliminary action by having the ingress router pre-generate both local and delegate prefixes from the server delegate prefix received from the BAS, before cascaded routers need them. This preliminary generation and distribution of prefix information simplifies the processing burden on cascaded routers, as they receive ready-to-use delegate prefixes that they can directly distribute to terminals without complex generation algorithms.
Data Source
AI summary
Embodiments of the present disclosure provide an Internet Protocol address allocation method and a router. The Internet Protocol address allocation method of the present disclosure includes receiving a delegate prefix of an upper-level network device, where the upper-level network device is a network device connected to a wide area network interface of the router; generating a local prefix of the router and a delegate prefix of the router according to the delegate prefix of the upper-level network device; and sending the local prefix of the router and the delegate prefix of the router to a lower-level router of the router. Internet Protocol addresses of devices in a cascaded network can be obtained in the embodiments of the present disclosure.