Method and apparatus for discovering network resource and topology

Abstract

The invention discloses a method for discovering network resource and topology, applied in a system including network IPv6 or double-stack network IPv6 / IPv4. The method comprises the following steps: one or more network devices receive an extendable link layer discover protocol LLDP transmitted by an adjacent network device, wherein the extendable LLDP carries a system global address of the adjacent network device and the system global address is address IPv6 and / or address IPv4; and one or more network devices extract the system global address and add the system global address into a local management information base MIB so that a plurality of network devices in the network store the system global address of the adjacent network device. In the invention, topology discovering is performedto the network IPv6 or double-stack network IPv6 / IPv4 by carrying IP address of mark network resources in the extendable LLDP.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method and device for discovering network resources and topologies. Background technique [0002] At present, there are more and more types of network devices and their respective configurations are intricate. In order to enable network devices of different manufacturers to discover each other and exchange their own systems and configuration information, a standard information exchange platform is required. Therefore, LLDP (Link Layer Discovery Protocol) , Link Layer Discovery Protocol) came into being. [0003] LLDP provides a standard link layer discovery method, which can organize the main capabilities, management addresses, device identifiers, interface identifiers and other information of the local device into different TLVs (Type / Length / Value, type / length / value) , and encapsulated in LLD PDU (Link Layer Discovery Protocol Data Unit, Link Layer Discovery ...

AI Technical Summary

Problems solved by technology

[0010] 1. In an IPv6 network, the next hop in the routing table is not a globally unique unicast address but a local link address (the local link address is the address used between directly connected devices, and is only valid between directly connected devices , it cannot be identified for indirectly connected devices), the network management system can only access valid addresses in the entire network during recursion, but cannot access local link addresses that are only valid for local links, so the routing table cannot be used for recursion Find

For example, the network includes device 1, device 2, and network management system. The network management system is directly connected to device 1, and the network management system is connected to device 2 through device 1. The routing table of device 1 includes the local link between device 1 and device 2. The network management system cannot identify the local link address of device 2 obtained from device 1, and cannot access the routing table of device 2.

[0011] 2. Since the subnet range of IPv6 is usually 64bit, there may be 2^64 addresses in a network in an IPv6 network. With such a huge number of addresses, it is impossible to use PING to discover terminals

[0012] 3. TRACEROUTE found that it is the same problem as IPv4. Due to the large amount of message interaction, it may not be possible to discover multiple devices in the network.

[0013] In an IPv6 network, the network topology information can be obtained through ND (Neighbor Discovery, Neighbor Discovery), but after the topology information is obtained by the ND, if the data packet is no longer received and sent back, the cache item storing the topology information will be deleted, so that Incomplete topology information

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