Product Documentation

Configuring a Backup Route

To prevent disruption in services when the primary route is down, you can configure a backup route. Once the backup route is configured, the Citrix ADC 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

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

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

``` pre codeblock

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.</span>
  2. In the Load Balancing Virtual Server dialog box, under Advanced, select Protection.</span>
  3. In the Backup Virtual Server drop-down list, select the secondary backup virtual server, and then click OK.</span>