Cisco RISE technology logically integrates a Citrix NetScaler ADC with a Cisco Nexus 7000 Series switch as a virtual service module. After you connect the NetScaler ADC and the Cisco Nexus 7000 series switch, an initial handshake is performed and a control channel is established between the two devices to exchange port-channel information. The following figure shows the RISE deployment:
Because the NetScaler ADC appears to be a virtual module in the switch, client traffic that reaches the Cisco Nexus 7000 series switch is intelligently routed to the NetScaler ADC and then to the servers. The return traffic flows to the ADC through the Cisco switch, and then back to the client.
The interface or port-channel that connects the NetScaler ADC and Cisco Nexus 7000 series switch is a single trunk carrying both control and data VLANs. The control VLAN is used for all control channel communication, and the data VLAN is used for communicating data traffic.
For more information, see Cisco RISE Integration Overview.
The feature integration that RISE enables between the NetScaler ADC and the Cisco Nexus 7000 Series switch provides the following functionalities:
RISE provides a plug and play auto-provisioning feature. You can directly connect the NetScaler ADC to the Cisco Nexus 7000 series switch.
The discovery and bootstrap mechanism enables the Cisco Nexus 7000 Series switch to perform the initial setup of NetScaler automatically by exchanging information such as NSIP and VLANs to set up a RISE channel, which transmits control and data packets. For details, see Discovery and Bootstrap.
The NetScaler ADC uses its health monitoring feature to track and support server health by sending health probes to verify server responses. The Intelligent Services Control Manager (iSCM) on the Cisco Nexus 7000 Series switch and the Intelligent Services Control Client (iSCC) on the NetScaler ADC also periodically send heartbeat packets to each other. If a critical error occurs and health monitoring detects a service instance failure, or if the heartbeat is missed six times successively, the RISE channel becomes nonoperational. For details, see Health Monitoring.
Automatic Policy Based Routing (APBR) automatically routes the return traffic from the servers to the NetScaler ADC, preserving the client IP addresses. The automatic policy based routes are defined on the Cisco Nexus 7000 series switch. When the return traffic from the server reaches the Cisco Nexus 7000 series switch, the APBR policies defined on the switch route the traffic to the NetScaler ADC, which in turn routes the traffic to the client.
You can connect the Citrix NetScaler appliance to the Cisco Nexus 7000 Series switch in one of the following ways:
Direct Connect Mode for a Standalone Switch
In a direct mode deployment, the NetScaler ADC is attached to a single Nexus 7000 Series switch. The switch can be standalone device or a vPC peer.
Indirect Connect Mode
In an indirect mode deployment, a virtual NetScaler ADC is connected to a Cisco Nexus 7000 Series switch through a switched layer 2 network.
Virtual Port Channel (vPC) Connect Mode
In a virtual port channel (vPC) direct mode deployment, the NetScaler ADC is attached to a single Nexus 7000 Series switch that is a vPC peer.
vPC Indirect Connect Mode
In a vPC indirect mode deployment, the NetScaler ADC is indirectly attached to a Cisco Nexus vPC peer through a layer 2 network.
For more information on connection modes, see Connection Modes.