Knowledgebase: Vigor2925
High Availability “Active Standby Configuration”
Posted by Edward Eroy on 14 June 2017 01:58 PM

This Application notes will discuss High Availability (HA) using “Active Standby” mode. In the scenario shown here we have three identical routers (Vigor2925) they are deployed in a campus environment where the routers are installed in three different locations for disaster recovery purposes. Routers are installed in Administrator Office, Engineering Office and Information Technology Office. The locations are 1km apart with optic fiber backbone connected to each Vigor2925 LAN port and each location has a separate WAN internet connection. The aim is to provide High Availability at each location. The network topology is shown in the diagram below:

 

Following routers support High Availability: Vigor2860, Vigor2925, Vigor2952, Vigor2960, Vigor3220 and Vigor3900

Mode

WAN Source

Online Status

Configuration Sync

Active-Standby

Primary and Secondary have different WAN sources

Both Primary and Secondary are online via their own different WAN lines

No Configuration Sync

Under Normal Operation

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/ActiveStandbyNormal01.jpg

Under normal High Availability operation, the traffic from subnet 192.168.1.1 is going through the Primary router which is located in the Information Technology Building.

The Primary Router is Down

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/ActiveStandbyNormal02.jpg

 

In the event the Primary router fails, the remaining routers will send packets to the rest of the HA router group to elect the next Primary router based priority settings. In this diagram above, the Administrator Office Building has higher priority value than Engineering Office Building all traffic is routed to Administrator Office Building.

Two Primary Routers are Down

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/ActiveStandbyNormal03.jpg

 

In the event that two routers have failed (Administrator Office Building and Information Technology Building routers) then traffic will be automatically routed to the Engineering Office Building.

Information Technology Office is out of Commission

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/ActiveStandbyNormal04.jpg

In this scenario the entire IT building is out of commission isolating each of the secondary routers from each other. In this scenario they each become Primary routers and run independently of each other. Internet traffic is routed by the corresponding WAN connection to the internet.

High Availability Active Standby Configuration:

Primary Router Configuration

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA01.jpg

 

 

 

  1. Change the IP address of LAN 1 to 192.168.1.2
  2. Go to LAN >> General Setup on the right side row tick “Details Page”

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA02.jpg

  1. Go to Application >> High Availability and select “Enable High Availability
  2. For “Redundancy Method” select “Active-Standby”
  3. For Priority ID enter 20
  4. Enable Syslog. This will be useful for troubleshooting
  5. Enable the LAN subnet for High Availability using the Virtual IP address 192.168.1.1

For more details on the High Availability you can visit the link

How to use High Availability

http://www.draytek.com/?a=resource/update&action=post/update&id=1660

Secondary Router Configuration

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA03.jpg

  1. Go to LAN >> General Setup on the right side row tick “Details Page”
  2. Change LAN 1 IP address to 192.168.1.3

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA04.jpg

  1. In Applications>>High Availability menu select “Enable High Availability”
  2. ForRedundancy Method select “Active-Standby”
  3. For Priority ID enter 15
  4. Enable Syslog. This will be useful for troubleshooting
  5. Enable the LAN subnet for High Availability using the Virtual IP address 192.168.1.1

Third Router Configuration

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA05.jpg

  1. Go to LAN >> General Setup on the right side row tick “Details Page”
  2. Change LAN 1 IP address to 192.168.1.4

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA06.jpg

  1. In Applications>>High Availability menu select “Enable High Availability”
  2. ForRedundancy Method select “Active-Standby”
  3. For Priority ID enter 10
  4. Enable Syslog. This will be useful for troubleshooting
  5. Enable the LAN subnet for High Availability using the Virtual IP address 192.168.1.1

How to check the High Availability Status

To know the High Availability status browse to the Virtual IP address 192.168.1.1 and go to Diagnostics >> High Availability Status.

http://i-lan.net.au/dfaq/image/HighAvailabilityActiveStandby/HA07.jpg

In the table it above, it shows that the router with the IP address of 192.168.1.2 is the Primary router and the two Secondary routers are also online.

 

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