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Detecting and protecting method of double-layer loop in VRRP topological network

A topology network and loop technology, applied in the field of switching, can solve problems related to VLAN, achieve the effect of solving loop problems and realizing loop detection and protection

Inactive Publication Date: 2009-10-14
LENOVO TERECO NETWORKS SHENZHEN
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Problems solved by technology

[0004] The present invention proposes a Layer 2 loop detection and protection method aiming at the present situation of VRRP application, loop calculation is performed independently in each VRRP-enabled VLAN, and detection and switching protection are performed, while Layer 2 switching devices only transparently transmit interactive messages , no need to participate in the loop calculation, thus solving the technical problem that the current VRRP layer 2 loop calculation needs to be related to VLAN

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  • Detecting and protecting method of double-layer loop in VRRP topological network

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Embodiment Construction

[0033] For ease of understanding, a brief introduction to Layer 2 switching devices and Layer 3 switching devices is given first.

[0034] Simply put, according to the 7-layer reference model of network OSI, the data link layer is the second layer, and the network layer is the third layer. If the switching device performs data packet switching (transferring data packets from one port to another port) based on data link layer information, then it is a layer 2 switching device, and if it is based on network layer information, then it is a layer 3 switching device .

[0035]Therefore, the three-layer exchange is proposed relative to the traditional exchange concept. The three-layer switching technology realizes the high-speed forwarding of data packets in the third layer of the network model. Simply put, the three-layer switching technology is: two-layer switching technology + three-layer forwarding technology. The function of network routing can be realized by applying the th...

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Abstract

The invention relates to a detecting and protecting method of a double-layer loop in a VRRP topological network. A core layer is accessed to two three-layer switching equipment which backup each other; one three-layer switching equipment is set as a sender state, one port is set as a main port, while the other three-layer switching equipment is set as a receiver state; when detecting the changes of a link state of the port thereof, the receiver initiatively sends a protocol message to notify the sender to conduct protection switching of the port state: if a mapping port exists at the port with the link state being connected state in the sender, the port is set as a blocked state, otherwise, the port is set as a forwarding state; the port with the link state being an off state in the sender is set as a closed state; the port with the link state being the connected state in the receiver is set as the forwarding state; and the port with the link state being the off state in the receiver is set as the closed state. The detecting and protecting method can effectively solve the problem of the loop in the existing VRRP topology, and simply and conveniently realize the detection and protection of the loop.

Description

technical field [0001] The invention relates to the switching technology applied to the Ethernet three-layer core switching equipment, in particular to a VRRP network environment detection and protection of the two-layer loop generated by the VRRP topology. Background technique [0002] Virtual Router Redundancy Protocol (VRRP: Virtual Router Redundancy Protocol) is a virtual router backup protocol, which realizes redundant backup of terminal default gateways. When one of the gateways fails, the backup gateway will automatically take over the forwarding work. End users are transparent. In the implementation of a network configured with VRRP, there must be redundant links for switching between active and standby gateways. The existence of redundant links is to ensure the switching of backup devices, but at the same time it will inevitably form a layer 2 loop. Therefore, the detection and protection of Layer 2 loops is a necessary process for VRRP application. [0003] Exis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/586
Inventor 叶子彭兆华车任秋
Owner LENOVO TERECO NETWORKS SHENZHEN
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