VRRP with PBR and IP SLA Tracking

The Virtual Router Redundancy Protocol (VRRP) is an IP address that acts as a gateway between the router and the appliances. The VRRP receives the traffic requests, and distributes the requests to the appliances connected to it. This allows for greater reliability and balancing traffic requests to the various appliances.

To increase fault-tolerance, configure the router to monitor the service levels of applications (SLA). IP SLA configurations acts as a heartbeat mechanism between the router and applicable SLA’d hosts.

	Note All traffic between the network components in this diagram is bi-directional.

1. The client computer requests access to a location on the Internet.
2. The request is sent to the router, where the source, destination, and service levels for the requested application is analyzed and compared to the policy configured on the router.
3. Based on the results of the analysis, the request is:
   1. sent to the switch, which evenly distributes the traffic between the connected Exinda appliances, and then back through the router to the requested destination.
   2. sent directly to the requested destination.

Limitations

This configuration is only supported on Cisco routers and only on the following releases:

• 3.2.1.1 Cisco IOS Release 12.3(11)T, 12.2(25)S, or Prior Releases

  http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_pi/configuration/15-2s/iri-pbr-mult-track.html#GUID-5A5BD687-C352-4C1E-8D79-8DEAC377182D

  Example configuration:

  http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_pi/configuration/15-2s/iri-pbr-mult-track.html#GUID-D26DE40C-B4CA-4DCC-8A3C-4068DA11EB48

• 3.2.1.2 Cisco IOS Release 12.3(14)T, 12.2(33)SXH, and Later Releases

  Configuration instructions can be found here:

  http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_pi/configuration/15-2s/iri-pbr-mult-track.html#GUID-16C12D82-0E4E-4872-B9DC-D32E3EE871BA

  Example configuration:

  http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_pi/configuration/15-2s/iri-pbr-mult-track.html#GUID-BC718E35-0A51-49ED-8820-156B625DBA7D