Configuring high availability nodes in different subnets 编辑
The following figure shows an HA deployment with the two systems located in different subnets:
Figure 1. High Availability over a Routed Network
In the figure, the systems NS1 and NS2 are connected to two separate routers, R3 and R4, on two different subnets. The Citrix ADC appliances exchange heartbeat packets through the routers. This configuration could be expanded to accommodate deployments involving any number of interfaces.
Note:
If you use static routing on your network, you must add static routes between all the systems to ensure that heartbeat packets are sent and received successfully. (If you use dynamic routing on your systems, static routes are unnecessary.)
If the nodes in an HA pair reside on two separate networks, the primary and secondary node must have independent network configurations. This means that nodes on different networks cannot share entities such as SNIP address, VLANs, and routes. This type of configuration, where the nodes in an HA pair have different configurable parameters, is known as Independent Network Configuration (INC) or Symmetric Network Configuration (SNC).
The following table summarizes the configurable entities and options for an INC, and shows how they must be set on each node.
| NetScaler entities | Options |
|---|---|
| IPs (NSIP/SNIPs) | Node-specific. Active only on that node. |
| VIPs | Floating. |
| VLANs | Node-specific. Active only on that node. |
| Routes | Node-specific. Active only on that node. Link load balancing routes are floating. |
| ACLs | Floating (Common). Active on both nodes. |
| Dynamic routing | Node-specific. Active only on that node. The secondary node should also run the routing protocols and peer with upstream routers. |
| L2 mode | Floating (Common). Active on both nodes. |
| L3 mode | Floating (Common). Active on both nodes. |
| Reverse NAT (RNAT) | RNAT configuration with the NAT IP address set to a virtual server IP address (VIP) because the VIP address is floating (common). |
As in configuring HA nodes in the same subnet, to configure HA nodes in different subnets, you log on to each of the two Citrix ADC appliances and add a remote node representing the other appliance.
Adding a Remote Node
When two nodes of an HA pair reside on different subnets, each node must have a different network configuration. Therefore, to configure two independent systems to function as an HA pair, you must specify INC mode during the configuration process.
When you add an HA node, you must disable the HA monitor for each interface that is not connected or not being used for traffic. For CLI users, this is a separate procedure.
To add a node by using the command line interface
At the command prompt, type:
add ha node <id> <IPAddress> -inc ENABLEDshow ha node
Example
> add ha node 3 10.102.29.170 -inc ENABLED
Done
> add ha node 3 1000:0000:0000:0000:0005:0600:700a:888b
Done
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