IP addressing for a cluster
In addition to the standard types of Citrix ADC-owned IP addresses—Citrix ADC NSIP, Virtual IP (VIP), and Subnet IP (SNIP)—a clustered Citrix ADC appliance can have a cluster management IP (CLIP) address. It can also have striped and spotted IP addresses.
CLIP address. An IP address owned by the cluster coordinator node (CCO). The CLIP address can float between different nodes in a cluster setup. If the CLIP is moved to a different node of the cluster, that node becomes the CCO. The CCO is the Citrix ADC appliance that is responsible for management tasks in the cluster. A network administrator uses the CLIP address to connect to the cluster to perform configuration and management tasks, such as accessing unified GUI, reporting, tracing packet flow, and collecting logs. You can add multiple CLIP addresses in a cluster on the same or different networks. Only configurations performed on the CCO through the cluster IP address are propagated to other nodes in the cluster.
Striped IP address. A logical IP address available on all nodes of the cluster, it can be either a VIP or SNIP address.
Spotted IP address. A logical IP (preferably SNIP address) is available only on one node. A spotted IP address has visibility on only that node. To minimize traffic-steering overhead, Citrix recommends that you use spotted SNIP address for backend communication with the server.
For example, in a four-node cluster group, you must configure each node with a spotted SNIP address. For more information on how to configure a spotted IP configuration, see Striped, Partially Striped, and Spotted Configurations.
You can define a SNIP address to be active on only one node, or active on all nodes. If a virtual IP address and Subnet IP address are available only on a specific node, it is of spotted configuration or if the Subnet IP address and Virtual server IP address are available on all nodes, it is defined as striped configuration.
In a four-node cluster setup, you must configure a spotted SNIP address on each node. For more information about configuring a spotted IP configuration, see Striped, Partially Striped, and Spotted Configurations.
In an L3 cluster setup, only spotted SNIP configuration is supported, as shown in the following table.