10 Configuring Wireless Redundancy C H A P T E R

10 Configuring Wireless Redundancy C H A P T E R
CH A P T E R
10
Configuring Wireless Redundancy
Controller redundancy in a wireless network allows you to reduce network downtime. In a redundancy
architecture, one controller is in the Active state and a second controller is in the Standby state. The
Standby controller continuously monitors the health of the Active controller via a redundant port. Both
controllers share the same configurations, including the IP address of the management interface.
The Standby or Active state of a controller is based on the redundancy Stock Keeping Unit (SKU), which
is a manufacturing ordered unique device identification (UDI). A controller with redundancy SKU UDI
is in the Standby state for the first time when it boots and pairs with a controller that runs a permanent
count license. For controllers that have permanent count licenses, you can manually configure whether
the controller is in the Active state or the Standby state.
In this release, a stateful switchover of access points (AP SSO) is supported. An AP SSO ensures that
the AP sessions are intact even after a switchover.
Stateful switchover of clients is not supported. This means that nearly all clients are deauthenticated and
forced to re-associate with the new controller in the Active state. The only exceptions to this rule are
clients on locally switched WLANs on access points in FlexConnect mode.
•
Prerequisites and Limitations for Redundancy
•
Configuring Redundancy Interfaces
•
Configuring Redundancy on a Primary Controller
•
Configuring Redundancy on a Secondary Controller
•
Configuring Redundant Guest Anchors in Wireless Network
•
Monitoring Redundancy States
•
Running the Redundancy Status Background Task
•
Configuring a Peer Service Port IP and Subnet Mask
•
Adding a Peer Network Route
•
Resetting and Uploading Files from the Secondary Server
•
Disabling Redundancy on Controllers
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Prerequisites and Limitations for Redundancy
Before configuring redundancy, you must consider the following prerequisites and limitations:
•
The redundancy is supported only on the 5500, 7500, 8500, and Wism2 controllers.
•
The primary and secondary controllers must be of the same hardware model.
•
The primary and secondary controllers must be running the same Controller software release.
•
The IP addresses of the management, redundancy management, and peer redundancy management
interfaces must be in the same subnet.
•
The service port IP address and route information is maintained for each device.
•
If the redundancy is enabled on a controller, the Prime Infrastructure or any other device cannot
manage the standby controller.
•
You cannot enable the redundancy on a controller if the controller is added to the Prime
Infrastructure through the service port. You must delete the controller and add it through the
management interface to enable the redundancy on that controller.
•
When there is an audit mismatch between a controller and the Prime Infrastructure, you must not
restore the redundancy parameters from the Prime Infrastructure on to the controller. However, you
can refresh the redundancy parameters in the Prime Infrastructure.
•
Before you enable the redundancy, you must download the certificates for each device.
•
Configuration is downloaded from the network to the active controller, and then the details are
transferred to the standby controller through the redundancy interface.
•
When an old active controller pairs up with the new active controller, the control is not transferred
back to the old active controller and it becomes the standby controller for the new active controller.
Configuring Redundancy Interfaces
There are two redundancy interfaces: redundancy-management interface and redundancy-port interface.
The redundancy-management interface is a local physical management interface that shares the subnet
mask, gateway, and VLAN ID from the management interface. You must configure only the IP address
for the redundancy-management interface to enable redundancy on the primary and secondary
controllers. The IP address for the redundancy-port interface is auto-generated and it is used internally.
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the controller that you have chosen as the primary controller. The details of the device appear on
the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Global Configuration. The Global Configuration
page appears.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Global
Configuration to access the Global Configuration details page.
Step 6
In the Redundancy-Management IP text box, enter an IP address that belongs to the management
interface subnet.
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Step 7
Click Save.
Configuring Redundancy on a Primary Controller
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the primary controller for which you have configured the redundancy-management interface IP
address. The details of the controller appear in the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Global Configuration. The Global Configuration
page appears.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Global
Configuration to access the Global Configuration details page.
Step 6
You must configure the following parameters before you enable the redundancy mode for the primary
controller:
•
Redundancy-Management IP—The IP address of the local physical management interface, which
you had configured in the redundancy-management interface details page is displayed. You can also
modify the IP address.
•
Peer Redundancy-Management IP—Enter the IP address of the peer redundancy-management
interface.
•
Redundant Unit—Choose Primary.
•
Mobility MAC Address—Enter the virtual MAC address for the redundancy pair. Ensure that the
mobility MAC address that you enter is the same for both primary and secondary controllers.
Step 7
Click Save. The Enabled check box for the redundancy mode becomes available.
Step 8
Select the Enabled check box for the redundancy mode to enable the redundancy on the primary
controller.
After you enable the redundancy, you cannot modify the Redundancy-Management IP, Peer
Redundancy-Management IP, Redundant Unit, and Mobility MAC Address parameters.
You cannot configure this controller during the redundancy pair-up process.
Step 9
Click Save. The configuration is saved and the system reboots.
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Configuring Redundancy on a Secondary Controller
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the controller that you have chosen as a secondary controller. The details of the controller appear
in the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Global Configuration. The Global Configuration
page appears.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Global
Configuration to access the Global Configuration details page.
Step 6
You must configure the following parameters before you enable the redundancy mode for the secondary
controller:
•
Redundancy-Management IP—Enter the IP address of the local physical management interface.
This IP address must be the same as the IP address of the peer redundancy-management interface of
the primary controller.
•
Peer Redundancy-Management IP—Enter the IP address of the peer physical management interface.
This IP address must be the same as the IP address of the local physical management interface of
the primary controller.
•
Redundant Unit—Choose Secondary.
•
Mobility MAC Address—Enter the virtual MAC address of the redundancy pair. Ensure that the
mobility MAC address that you enter is the same for both primary and secondary controllers.
Step 7
Click Save. The Enabled check box for the redundancy mode becomes available for editing.
Step 8
Select the Enabled check box for the redundancy mode to enable the redundancy on the secondary
controller.
After you enable the redundancy, you cannot modify the Redundancy-Management IP, Peer
Redundancy-Management IP, Redundant Unit, and Mobility MAC Address parameters.
You cannot configure the primary controller during the redundancy pair-up process.
Step 9
Click Save. The configuration is saved and the system reboots.
Configuring Redundant Guest Anchors in Wireless Network
You can configure redundant guest anchors in you wireless network by specifying priority for controller
group. When a controller is down, the client associated to it can join another controller within the same
priority. If all controllers within the priority is down, then the client will associate with a controller to
the next lower priority. You need to configure priority. By default, the priority is set to 3.
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Monitoring Redundancy States
After redundancy mode is enabled on the primary and secondary controllers, the system reboots. The
redundancy state for both the controllers becomes Enabled in the Wireless Controller Members list page.
The following traps are triggered:
•
RF_SWITCHOVER_ACTIVITY—This trap is triggered when the standby controller becomes the
new active controller.
•
RF_PROGRESSION_NOTIFY—This trap is triggered by the primary or active controller when the
peer state changes from Disabled to StandbyCold, and then to StandbyHot.
•
RF_HA_SUP_FAILURE_EVENT—This trap is triggered when the redundancy fails because of a
discrepancy between the active and the standby controllers.
For more information about these traps, see Cisco Prime Infrastructure Alarms and Events.
You can view the redundancy state details, including the local and peer state, unit, IP addresses of the
redundancy management, peer redundancy management, redundancy port, peer redundancy port, and
peer service port of the paired controller.
To view these details:
•
In Converged view, choose Monitor > Network Devices > Device Type > Wireless Controller >
Controller > Device Details > Redundancy > Redundancy States.
•
In Classic view: Choose Monitor > Controllers > Ctrl IP addr > Redundancy > Redundancy
States.
Running the Redundancy Status Background Task
When the peer state changes from StandbyCold to StandbyHot, Prime Infrastructure sometimes misses
redundancy traps. As a result, the redundancy pair-up process cannot be completed.
To fix this issue, you must run the Redundancy Status background task manually. Running this task:
•
Removes the standby controller from Prime Infrastructure.
•
Swaps the network route table entries with the peer network route table entries.
•
Updates the redundancy state information and system inventory information.
Once the redundancy pair-up process is completed, the redundancy state for the active controller
becomes Paired and the standby controller is removed from Prime Infrastructure.
Step 1
In Converged view: Choose Administration > Background Tasks.
Step 2
In the Other Background Tasks area, select the Redundancy Status background task.
Step 3
Choose Select a command >Execute Now, then click Go.
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Configuring a Peer Service Port IP and Subnet Mask
You can configure a peer service port IP address and a subnet mask only when the state of the peer
controller is in StandbyHot. Ensure that DHCP is disabled on the local service port before you configure
the peer service port IP address.
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the primary or active controller. The details of the controller appear in the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Global Configuration. The Global Configuration
page appears.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Global
Configuration to access the Global Configuration page.
Step 6
Step 7
Complete the following fields:
•
Peer Service Port IP—Enter the IP address of the peer service port.
•
Peer Service Netmask IP—Enter the IP address of the peer service subnet mask.
Click Save.
Adding a Peer Network Route
You can add a peer network route on an active controller only when the state of the peer controller is in
StandbyHot. A new network route table is maintained. When the standby controller becomes active, the
entries of the network route table swaps with the entries of the peer network route table.
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the primary controller for which you have configured the redundancy-management interface IP
address. The details of the controller appear in the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Peer Network Route.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Peer
Network Route to access the Peer Network Route list page.
Step 6
Choose Select a command > Add Peer Network Route.
Step 7
Click Go. The Peer Network Route Details page appears.
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Step 8
Step 9
Complete the following fields:
•
IP Address—Enter the IP address of the peer network route.
•
IP Netmask—Enter the subnet mask of the peer network route.
•
Gateway IP Address—Enter the IP address of the peer network route gateway.
Click Save. The peer network route is added.
Resetting and Uploading Files from the Secondary Server
You can reset the secondary server when the secondary server is in the StandbyHot state and the HA
pair-up process is complete. You can also upload the files from the secondary server to the primary
server.
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the primary server for which you have configured the redundancy-management interface IP
address. The details of the controller appear on the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Device Details > Redundancy > Redundancy Commands.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy >
Redundancy Commands.
Step 6
Choose Reset Standby to reset the secondary server.
Step 7
Choose Upload File from Standby Controller to upload files from the secondary to primary server.
Disabling Redundancy on Controllers
When you disable redundancy on the controller, both active and standby controllers reboot. You must
refresh the configuration from the device to remove any audit mismatches in the redundancy parameters.
The active controller becomes a standalone controller and the standby controller reboots with all the
ports disabled.
Step 1
In Converged view: Choose Configuration > Network Devices.
Step 2
In the Device Group area, expand Device Type, then expand Wireless Controller.
Step 3
Select the controller for which you want to disable the redundancy. The details of the controller appear
on the lower part of the page.
Step 4
Click the Configuration tab.
Step 5
From the left sidebar menu, choose Redundancy > Global Configuration. The Global Configuration
details page appears.
If you are using Classic view, choose Configure > Controllers > Ctrl IP addr > Redundancy > Global
Configuration to access the Global Configuration details page.
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Step 6
Unselect the Enabled check box for the redundancy mode to disable the redundancy on the selected
controller.
Step 7
Click Save. The configuration is saved and the system reboots.
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