Product Documentation

Configuring a Backup Route

Jul 13, 2017

To prevent disruption in services when the primary route is down, you can configure a backup route. Once the backup route is configured, the NetScaler appliance automatically uses it when the primary route fails. First create a primary virtual server as described in "Configuring an LLB Virtual Server and Binding a Service." To configure a backup route, create a secondary virtual server similar to a primary virtual server and then designate this virtual server as a backup virtual server (route).

In the following diagram, Router-vip is the primary virtual server, and Backup_Router-vip is the secondary virtual server designated as the backup virtual server.

Figure 1. Backup Route Setup


Note: If your Internet service provider has provided an IPv6 address, replace the IPv4 service with an IPv6 service in the above figure.

By default, all traffic is sent through the primary route. However, when the primary route fails, all traffic is diverted to the backup route as shown in the following diagram.

Figure 2. Backup Routing in Operation


Note: If your Internet service provider has provided an IPv6 address, replace the IPv4 service with an IPv6 service in the above figure.

To set the secondary virtual server as the backup virtual server by using the command line interface

At the command prompt, type:

set lb vserver <name> -backupVserver <string>

Example

 
set lb vserver Router-vip -backupVServer Backup_Router-vip 
> show lb vserver Router-vip 
        Router-vip (0.0.0.0:0) - ANY    Type: ADDRESS 
        State: UP 
        Last state change was at Fri Sep  3 04:46:48 2010 
        Time since last state change: 0 days, 03:09:45.600 
        Effective State: UP 
        Client Idle Timeout: 120 sec 
        Down state flush: ENABLED 
        Disable Primary Vserver On Down : DISABLED 
        No. of Bound Services :  1 (Total)       1 (Active) 
        Configured Method: ROUNDROBIN 
        Mode: IP 
        Persistence: DESTIP     Persistence Mask: 255.255.255.255       Persistence v6MaskLength: 128   Persistence Timeout: 2 min 
        Backup: Router2-vip 
        Connection Failover: DISABLED 
 Done 

To set the secondary virtual server as the backup virtual server by using the configuration utility

  1. Navigate to Traffic Management > Load Balancing > Virtual Servers and select the secondary virtual server for which you want to configure the backup virtual server.
  2. In the Load Balancing Virtual Server dialog box, under Advanced, select Protection.
  3. In the Backup Virtual Server drop-down list, select the secondary backup virtual server, and then click OK.