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Configuring the High Availability Setup on the
Appliances
Aug 20, 2013
High availability(HA) works directly between the NetScaler instances of two SD-WAN 4000, 4100, or 5100 appliances. As
shown in the configuration , the two appliances are configured almost identically, except for management network IP
addresses.
Note
The accelerator instances on the two appliances are not synchronized, and must be kept consistent manually. Take this into
account when deciding whether to use HA.
For a smooth installation, install and test one appliance before adding the second one, noting all configuration changes, especially
to the accelerator.
You must use the same aPA and signaling addresses on both appliances. However, all management subnet IP addresses must be
unique on each appliances.
If the active appliance becomes unavailable, the passive appliance transparently takes over the function of the primary
appliance. This is called “failover.” As a result, disruption of services over the network is minimal. After a failover, all clients
must reestablish their connections to the managed servers, but the session persistence rules are maintained as they were
before the failover.
HA is supported in all deployment modes, and the HA configuration procedure is the same for all modes. The two appliances
should be running identical hardware, licensing, and software releases, and must be deployed identically, using the same
deployment modes on the same subnets.
When you enable HA, the configuration of the primary appliance’s NetScaler instance is copied to the secondary appliance
as part of the NetScaler HA synchronization process.
T o conf igure a high availabilit y set up of Net Scaler
T o conf igure a high availabilit y set up of Net Scaler inst ances
inst ances
1. Complete the configuration for your chosen deployment mode (inline or WCCP). Note that all parameters for the
external traffic subnet and the private traffic subnet are identical for both appliances, but some management subnet
values are different on the two appliances.
2. Fully configure appliance #1 and test it thoroughly. If inline mode is used, do not connect the traffic network to the
bridge ports on appliance #2.
3. Fully configure appliance #2. Note that some parameters are different on the two appliances: H1, H4, H5, H6, and H17
are used on the second appliance in place of M1, M4, M5, M6, and M17. Make sure that the accelerators are configured
identically to the ones on appliance #1, and that both appliances have identical VLAN definitions in the NetScaler
instances.
4. Access the NetScaler instance on appliance #1, by specifying its IP address (M17) in a web browser.
5. Log on to the NetScaler instance.
6. In the Navigation pane, expand the System node.
7. Select the High Availability node.
Summary of Contents for NetScaler EE
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