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2 6 0 0 Technology Brief Auto Healing NSBU ZyXEL Communications Corp. November, 2013

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Technology Brief

Auto Healing

NSBU

ZyXEL Communications Corp.

November, 2013

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Contents

Introduction

How It Works

Benefits for Users and SIs

Technical Details

Deployment Notes

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Introduction

What’s Auto Healing?

A high-availability WLAN feature that:

Automatically detects AP failures

Compensates by increasing the wireless coverage of nearby APs

This technology helps:

Minimize outage impact

Maximize WLAN availability

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How It Works

ScenarioA floor in a campus with six rooms. Each room is covered by an AP. The teachers and students are using tablet computers in class.

Campus

AP3AP2

AP4 AP5 AP6

AP1

Room1 Room2 Room3

Room4 Room5 Room6

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How It Works

Without Auto HealingRoom2 loses wireless service when AP2 fails. The IT staff needs to rush to the classroom and fix the failed AP to recover the wireless service. The class is interrupted.

Campus

AP3AP2

AP4 AP5 AP6

AP1

Room1 Room2 Room3

Room4 Room5 Room6

FAIL

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How It Works

With Auto HealingWith Auto Healing, the WLAN is scanned periodically. When AP1, AP3 and AP5 finds that AP2 is “dead”, they will increase their output power to cover the wireless “dead zone”.

Campus

AP3AP2

AP4 AP5 AP6

AP1

Room1 Room2 Room3

Room4 Room5 Room6

FAIL

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How It Works

RecoveryWhen AP1, AP3 and AP5 finds that AP2 has recovered (via periodic scanning), they will automatically decrease their output power to the original state.

Campus

AP3AP2

AP4 AP5 AP6

AP1

Room1 Room2 Room3

Room4 Room5 Room6

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Benefits for Users and SIs

Minimize outage impactIT staff can continue to provide wireless services to the users in Room2 and replace the failed AP when the class has ended, or when the new AP has been delivered by the SI.

Maximize WLAN availabilitySIs do not need to be on site right away to replace the AP and restore the wireless service.

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Technical Details

How does the scanning work?Scheduled scan

By default, an AP scans the availability of its neighbor APs (in its neighbor list) with an interval of 5 minutes*

Each scan takes 1 minute to complete

When an AP failure is detected, 2 more confirm scans will be conducted before increasing output power

Neighbor APs will increase output power within 3 minutes of detecting an AP failure (1 scheduled scan + 2 confirm scans)

When an AP recovery is detected, neighbor APs will decrease output power immediately after the scan (within 1 minute)

*The scan interval can be configured between 5 to 30 minutes

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How does the scanning work?Scheduled scan

Technical Details

Increase output power Decrease output power

3 minutes total

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Technical Details

How does the scanning work?Event scan

When the WLAN controller detects a CAPWAP connection from a failed AP (possible recovery), it will initiate a event scan immediately to check the availability of it’s wireless signal

When a wireless signal is detected, neighbor APs will decrease output power immediately after the scan (within 1 minute)

Decrease output power

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Technical Details

More detailsThe scan interval can be configured between 5 to 30 mins

By default, an AP will include neighbor APs that have an RSSI of -85 or better into its neighbor list

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Deployment Notes

Output power adjustmentTo enable Auto Healing, each AP needs to reserve some output power to cover neighbor APs in cases of AP failures

Before deploying Auto Healing, please ensure the AP’s output power is adjusted to less than 100% (for example 60%)

It is not possible for an AP to transmit more than its max. output power

(100%), so reducing the AP’s output power is necessary for Auto

Healing to work

By default, an APs output power is set to maximum level (100%)

The reserved output power will be used to maximize WLAN availability when a neighbor AP fails

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Deployment Notes

RF planningFor Auto Healing to function correctly, please make sure that APs are not too far away from each other

The functioning AP may not be able to cover the “dead zone”

AP1 AP2

AP1 AP2

Initial output power

Increased output power

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Deployment Notes

RF planningFor Auto Healing to function correctly, please make sure that APs are not too close to each other

The functioning AP may not increase its output power because it may already cover the “dead zone”

AP1 AP2

Initial output power

AP1 AP2

Initial output power

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