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Distributed spanning tree protocol on a multi chassis port channel

A spanning tree protocol, multi-chassis technology, applied in the field of networking, can solve problems such as loss of desired redundancy

Inactive Publication Date: 2014-09-03
CISCO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the MCT ports are blocked, the desired redundancy provided by the MCPC topology will be lost

Method used

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  • Distributed spanning tree protocol on a multi chassis port channel
  • Distributed spanning tree protocol on a multi chassis port channel
  • Distributed spanning tree protocol on a multi chassis port channel

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] Embodiments of the present disclosure provide techniques for routing traffic in a network represented by a logical topology such as a Multi-Chassis Port Channel (MCPC) or Multi-Chassis Ether Channel (MCEC) topology. Designs such as STP are designed to avoid routing paths by modifying the Port Priority Vector (PPV) to include an additional "SwitchID" field that identifies the specified Bridge ID or Local Switch ID based on whether the corresponding port is used as an MCT The routing protocol in the loop can avoid blocking the MCT port.

[0017] sample network

[0018] figure 1 A physical representation of a network that may utilize the techniques provided by this disclosure is shown. The network comprises a first arrangement of switches 120 (S1, S4 and S5) interconnected via a second arrangement of switches 130 (S2 and S3).

[0019] As shown, S2 and S3 may be connected via a multi-chassis trunk line 132 to form the MCPC multiplexer 110 . Each switch in the MCPC multi...

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PUM

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Abstract

In one embodiment, a technique for routing traffic in a network represented by a logical topology such as a Multi-Chassis Port Channel (MCPC) or Multi-Chassis Ether Channel (MCEC) topology is provided. Designs such as STP are designed to avoid routing paths by modifying the Port Priority Vector (PPV) to include an additional "SwitchID" field that identifies the specified Bridge ID or Local Switch ID based on whether the corresponding port is used as an MCT The routing protocol in the loop can avoid blocking the MCT port.

Description

technical field [0001] Embodiments of the present disclosure relate generally to networking, and more specifically to controlling the flow of network traffic. Background technique [0002] A multi-chassis port channel (Multi Chassis Port Channel, MCPC) or a multi-chassis Ether Channel (Multi Chassis Ether Channel, MCEC) has two ends of a port channel terminated on two different switches. These switches are often called aggregation switches. Having multiple ends of a port channel terminated on different channels provides redundancy to span not only link failures, but also individual switch failures. [0003] In contrast, in a regular port channel, all links belonging to the port channel terminate on a single switch. A port channel is treated by Spanning Tree Protocol (STP) as a single logical link, and any hardware operations such as setting port status or MAC flush / Age are applied to all member links of the port channel. This way, STP doesn't cause any problems on regular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L12/24H04L45/243H04L49/111
CPCH04L12/462H04L45/245H04L49/552Y02D30/50
Inventor 塔曼·卡恩隆那科·德赛
Owner CISCO TECH INC