Auto Policy-Based Routing; Use Source Ip Option; Appliance High Availability - Cisco Nexus 7000 Series Configuration Manual

Auto Policy-Based Routing

Auto Policy-Based Routing
Policy-Based Routing (PBR) allows the creation of policies or rules that can selectively alter the path that
packets take within the network. PBR can be used to mark packets so that certain types of traffic are prioritized
over the rest, sent to a different destination, or exit through a different physical interface on the router.
Classification of interesting traffic is performed using access control lists (ACLs).
PBR rules ensure that return traffic from the real server (RS) reaches the Remote Integrated Service Engine
(RISE) appliance. The control channel on the Cisco Nexus Series switch is used to automate the creation of
PBR rules.
After the RISE appliance applies the required configuration, the appliance sends auto PBR (APBR) messages
to the Cisco Nexus switch including a list of servers (IP addresses, ports, and protocol) and the next-hop IP
address of the appliance.
The Cisco Nexus switch creates the PBR rules for the associated switch virtual interfaces (SVIs). For the local
servers, the switch creates the ACLs and route maps.

Use Source IP Option

Auto policy-based routing (APBR) rules are configured on the Cisco Nexus switch by the Citrix NetScaler
appliance only if the Use Source IP (USIP) option is enabled in the services or service groups on the Citrix
NetScaler appliance. The rules are withdrawn when the USIP option is disabled. The USIP option can be
configured locally or globally.

Appliance High Availability

High availability is supported for RISE appliances that share an APBR applied interface. Connect your
appliances and Cisco Nexus switches using one of the following topologies to enable high availability:
Cisco Remote Integrated Service Engine for Citrix NetScaler Appliances and Cisco Nexus 7000 Series Switches
Configuration Guide
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Configuring Auto Policy-Based Routing