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Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Bengaluru 17.5.x

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Book Title

Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Bengaluru 17.5.x

Chapter Title

High Availability

Results

Updated:
June 17, 2021

Chapter: High Availability

High Availability

Feature History for High Availability

This table provides release and related information for the features explained in this module.

These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise.

Table 1. Feature History for High Availability

Release

Feature

Feature Information

Cisco IOS XE Amsterdam 17.1.1s

Redundant Management Interface

The Redundancy Management Interface (RMI) is used as a secondary link between the active and standby controllers. This interface is the same as the Wireless Management Interface and the IP address on this interface is configured in the same subnet as the Wireless Management Interface.

Cisco IOS XE Bengaluru 17.4.1

Gateway Reachability Detection

Gateway reachability feature mimimizes the downtime on APs and clients when the gateway reachability is lost on the active controller.

Cisco IOS XE Bengaluru 17.5.1

Standby Monitoring Enhancements

The standby monitoring enhancements feature monitors standby CPU or memory information from the active controller. Also, this feature independently monitors standby using SNMP for the interface MIB.

The cLHaPeerHotStandbyEvent and cLHaPeerHotStandbyEvent MIB objects in CISCO-HA-MIB are used to monitor the standby HA status.

Cisco IOS XE Bengaluru 17.5.1

Auto-Upgrade

The auto-upgrade feature enables the standby controller to upgrade to active controller's software image, so that both controllers can form an high availability (HA) pair.

Information About High Availability

High Availability (HA) allows you to reduce the downtime of wireless networks that occurs due to the failover of controllers. The HA Stateful Switch Over (SSO) capability on the controller allows AP to establish a CAPWAP tunnel with the active controller. The active controller shares a mirror copy of the AP and client database with the standby controller. The APs won’t go into the discovery state and clients don’t disconnect when the active controller fails. The standby controller takes over the network as the active controller. Only one CAPWAP tunnel is maintained between the APs and the controller that is in an active state.

HA supports full AP and client SSO. Client SSO is supported only for clients that have completed the authentication and DHCP phase, and have started passing traffic. With Client SSO, the client information is synced to the standby controller when the client associates to the controller or when the client parameters change. Fully authenticated clients, for example, the ones in RUN state, are synced to the standby. Thus, client reassociation is avoided on switchover making the failover seamless for the APs and clients, resulting in zero client service downtime and zero SSID outage. This feature reduces major downtime in wireless networks due to failure conditions such as box failover, network failover, or power outage on the primary site.


Note

  • In HA mode, the RP port shut or no shut should not be performed during the controller bootup.

Note

When the controller works as a host for spanning tree, ensure that you configure portfast trunk, using spanning-tree port type edge trunk or spanning-tree portfast trunk commands, in the uplink switch to ensure faster convergence.


Note

You can configure FIPS in HA setup. For information, see the Configuring FIPS in HA Setup.


Note

The IPv4 secondary address is used internally for RMI purpose. So, it is not recommended to configure the secondary IPv4 address.

In case of IPv6, only one management IPv6 is allowed, secondary address is configured for RMI-IPv6 purpose. It is not recommended to have more than one IPv6 management on the Wireless Management Interface (WMI).

More than one management IPv4 and IPv6 addresses on WMI can result in unpredictable behaviour.

Prerequisites for High Availability

External Interfaces and IPs

Because all the interfaces are configured only on the Active box, but are synchronized with the Standby box, the same set of interfaces are configured on both controllers. From external nodes, the interfaces connect to the same IP addresses, irrespective of the controllers they are connected to.

For this purpose, the APs, clients, DHCP, Cisco PrimeInfrastructure, Cisco DNA Centre, and Cisco Identity Services Engine (ISE) servers, and other controller members in the mobility group always connect to the same IP address. The SSO switchover is transparent to them. But if there are TCP connections from external nodes to the controller, the TCP connections need to be reset and reestablished.

HA Interfaces

The HA interface serves the following purposes:

  • Provides connectivity between the controller pair before an IOSd comes up.

  • Provides IPC transport across the controller pair.

  • Enables redundancy across control messages exchanged between the controller pair. The control messages can be HA role resolution, keepalives, notifications, HA statistics, and so on.

You can select either SFP or RJ-45 connection for HA port. Supported Cisco SFPs are:

  • GLC-SX-MMD

  • GLC-LH-SMD

When either SFP or RJ-45 connection is present, HA works between the two controllers. The SFP HA connectivity takes priority over RJ-45 HA connectivity. If SFP is connected when RJ-45 HA is up and running, the HA pair reloads. The reload occurs even if the link between the SFPs isn’t connected.

Restrictions on High Availability

  • The flow states of the NBAR engine are lost during a switchover in an HA scenario in local mode. Because of this, the classification of flows will restart, leading to incorrect packet classification as the first packet of the flow is missed.

  • The HA connection supports only IPv4.

  • Switchover and an active reload and forces a high availability link down from the new primary.

  • Hyper threading is not supported and if enabled HA keepalives will be lost in case of an HA system that results in stack merge.

  • Two HA interfaces (RMI and RP) must be configured on the same subnet, and the subnet cannot be shared with any other interfaces on the device.

  • It is not possible to synchronize a TCP session state because a TCP session cannot survive after a switchover, and needs to be reestablished.

  • The Client SSO does not address clients that have not reached the RUN state because they are removed after a switchover.

  • Statistics tables are not synced from active to standby controller.

  • Machine snapshot of a VM hosting controller HA interfaces is not supported. It may lead to a crash in the HA controller.

  • Mobility-side restriction: Clients which are not in RUN state will be forcefully reauthenticated after switchover.

  • The following application classification may not be retained after the SSO:

    • AVC limitation—After a switchover, the context transfer or synchronization to the Standby box does not occur and the new active flow needs to be relearned. The AVC QoS does not take effect during classification failure.

    • A voice call cannot be recognized after a switchover because a voice policy is based on RTP or RTCP protocol.

    • Auto QoS is not effective because of AVC limitation.

  • The active controller and the standby controller must be paired with the same interface for virtual platforms. For hardware appliance, there is a dedicated HA port.

  • Static IP addressing can synch to standby, but the IP address cannot be used from the standby controller.

  • You can map a dedicated HA port to a 1 GB interface only.

  • To use EtherChannels in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16.12.x, ensure that the channel mode is set to On.

  • Etherchannel Auto-mode is not supported in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16.12.x.

  • LACP and PAGP is not supported in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16.12.x.

  • When the controller works as a host for spanning tree, ensure that you configure portfast trunk in the uplink switch using spanning-tree port type edge trunk or spanning-tree portfast trunk command to ensure faster convergence.

  • The clear chassis redundancy and write erase commands will not reset the chassis priority to the default value.

  • While configuring devices in HA, the members must not have wireless trustpoint with the same name and different keys. In such a scenario, if you form an HA pair between the two standalone controllers, the wireless trustpoint does not come up after a subsequent SSO. The reason being the rsa keypair file exists but it is incorrect as the nvram:private-config file is not synched with the actual WLC_WLC_TP key pair.

    As a best practice, before forming an HA, it is recommended to delete the existing certificates and keys in each of the controllers which were previously deployed as standalone.

Configuring High Availability (GUI)

You can configure the high availability parameters for the selected access point by performing the following steps.

Procedure

Step 1

Choose Configuration > Wireless > Access Points > .

Step 2

Click an AP Name. The Edit AP screen appears.

Step 3

Click the High Availability tab.

Step 4

Enter the name of the Primary Controller and Management IP Address (IPv4/IPv6). Similarly, enter names and management IP addresses for the Secondary and Tertiary Controllers.

Step 5

Choose any one of the available options from the AP Failover Priority drop-down list. The available options are:

  • Low: Assigns the AP to the level 1 priority, which is the lowest priority level. This is the default value.

  • Medium: Assigns the AP to the level 2 priority.

  • High: Assigns the AP to the level 3 priority.

  • Critical: Assigns the access point to the level 4 priority, which is the highest priority level.

Note 

If the AP needs to be moved immediately to secondary/tertiary controller, Critical level is used.
Step 6

Click the Update & Apply to Device button.

Configuring High Availability (CLI)

Before you begin

The active and standby controller should be in the same mode, either Install mode or Bundle mode, with same image version. We recommend that you use Install mode.

Procedure

  Command or Action Purpose
Step 1

chassis chassis-num priority chassis-priority

Example:

Device# chassis 1 priority 1

(Optional) Configures the priority of the specified device.

Note 

From Cisco IOS XE Gibraltar 16.12.x onwards, device reload is not required for the chassis priority to become effective.

  • chassis-num —Enter the chassis number. The range is from 1 to 2.

  • chassis-priority —Enter the chassis priority. The range is from 1 to 2. The default value is 1.

Note 

When both the devices boot up at the same time, the device with higher priority becomes active, and the other one becomes standby. If both the devices are configured with the same priority value, the one with the smaller MAC address acts as active and its peer acts as standby.

Step 2

chassis redundancy ha-interface GigabitEthernet numlocal-ip local-chassis-ip-addr network-mask remote-ip remote-chassis-ip-addr

Example:

Device# chassis redundancy ha-interface 
GigabitEthernet 2 local-ip 4.4.4.1 /24 remote-ip 4.4.4.2

Configures the chassis high availability parameters.

  • num —GigabitEthernet interface number. The range is from 0 to 32.

  • local-chassis-ip-addr —Enter the IP address of the local chassis HA interface.

  • network-mask —Enter the network mask or prefix length in the /nn or A.B.C.D format.

  • remote-chassis-ip-addr —Enter the remote chassis IP address.

Step 3

chassis redundancy keep-alive timer timer

Example:

Device# chassis redundancy keep-alive timer 6

Configures the peer keepalive timeout value.

Time interval is set in multiple of 100 ms (enter 1 for default).
Step 4

chassis redundancy keep-alive retries retry-value

Example:

Device# chassis redundancy keep-alive retries 8

Configures the peer keepalive retry value before claiming peer is down. Default value is 5.

Disabling High Availability

If the controller is configured using RP method of SSO configuration, use the following command to clear all the HA-related parameters, such as local IP, remote IP, HA interface, mask, timeout, and priority:

clear chassis redundancy

If the controller is configured using RMI method, use the following command:

no redun-management interface vlan chassis


Note

Reload the devices for the changes to take effect.

After the HA unpairing, the standby controller startup configuration and the HA configuration will be cleared and standby will go to Day 0.

Before the command is executed, the user is prompted with the following warning on the active controller:


Device# clear chassis redundancy

WARNING: Clearing the chassis HA configuration will result in both the chassis move into
Stand Alone mode. This involves reloading the standby chassis after clearing its HA
configuration and startup configuration which results in standby chassis coming up as a totally
clean after reboot. Do you wish to continue? [y/n]? [yes]:

*Apr 3 23:42:22.985: received clear chassis.. ha_supported:1yes
WLC#
*Apr 3 23:42:25.042: clearing peer startup config
*Apr 3 23:42:25.042: chkpt send: sent msg type 2 to peer..
*Apr 3 23:42:25.043: chkpt send: sent msg type 1 to peer..
*Apr 3 23:42:25.043: Clearing HA configurations
*Apr 3 23:42:26.183: Successfully sent Set chassis mode msg for chassis 1.chasfs file updated
*Apr 3 23:42:26.359: %IOSXE_REDUNDANCY-6-PEER_LOST: Active detected chassis 2 is no
longer standby

On the standby controller, the following messages indicate that the configuration is being cleared:

Device-stby#

*Apr 3 23:40:40.537: mcprp_handle_spa_oir_tsm_event: subslot 0/0 event=2
*Apr 3 23:40:40.537: spa_oir_tsm subslot 0/0 TSM: during state ready, got event 3(ready)
*Apr 3 23:40:40.537: @@@ spa_oir_tsm subslot 0/0 TSM: ready -> ready
*Apr 3 23:42:25.041: Removing the startup config file on standby

!Standby controller is reloaded after clearing the chassis.

Copying a WebAuth Tar Bundle to the Standby Controller

Use the following procedure to copy a WebAuth tar bundle to the standby controller, in a high-availability configuration.

Procedure

Step 1

Choose Administration > Management > Backup & Restore.

Step 2

From the Copy drop-down list, choose To Device.

Step 3

From the File Type drop-down list, chooseWebAuth Bundle.

Step 4

From the Transfer Mode drop-down list, choose TFTP, SFTP, FTP, or HTTP.

The Server Details options change based on the file transfer option selected.

  • TFTP

    • IP Address (IPv4/IPv6): Enter the server IP address (IPv4 or IPv6) of the TFTP server that you want to use.

    • File Path: Enter the file path. The file path should start with slash a (/path).

    • File Name: Enter a file name.

      The file name should not contain spaces. Underscores (_) and hyphen (-) are the only special characters that are supported. Ensure that file name ends with .tar, for example, webauthbundle.tar.

  • SFTP

    • IP Address (IPv4/IPv6): Enter the server IP address (IPv4 or IPv6) of the SFTP server that you want to use.

    • File Path: Enter the file path. The file path should start with slash a (/path).

    • File Name: Enter a file name.

      The file name should not contain spaces. Underscores (_) and hyphen (-) are the only special characters that are supported. Ensure that file name ends with .tar, for example, webauthbundle.tar.

    • Server Login UserName: Enter the SFTP server login user name.

    • Server Login Password: Enter the SFTP server login passphrase.

  • FTP

    • IP Address (IPv4/IPv6): Enter the server IP address (IPv4 or IPv6) of the TFTP server that you want to use.

    • File Path: Enter the file path. The file path should start with slash a (/path).

    • File Name: Enter a file name.

      The file name should not contain spaces. Underscores (_) and hyphen (-) are the only special characters that are supported. Ensure that file name ends with .tar, for example, webauthbundle.tar.

    • Logon Type: Choose the login type as either Anonymous or Authenticated. If you choose Authenticated, the following fields are activated:

      • Server Login UserName: Enter the FTP server login user name.

      • Server Login Password: Enter the FTP server login passphrase.

  • HTTP

    • Source File Path: Click Select File to select the configuration file, and click Open.

Step 5

Click the Yes or No radio button to back up the existing startup configuration to Flash.

Save the configuration to Flash to propagate the WebAuth bundle to other members, including the standby controller. If you do not save the configuration to Flash, the WebAuth bundle will not be propagated to other members, including the standby controller.

Step 6

Click Download File.

System and Network Fault Handling

If the standby controller crashes, it reboots and comes up as the standby controller. Bulk sync follows causing the standby to become hot. If the active controller crashes, the standby becomes active. The new active controller assumes the role of master and tries to detect a dual active.

The following matrices provide a clear picture of the conditions the controller switchover would trigger:

Table 2. System and Network Fault Handling

System Issues

Trigger

RP Link Status

Peer Reachability through RMI

Switchover

Result

Critical process crash

Up

Reachable

Yes

Switchover happens

Forced switchover

Up

Reachable

Yes

Switchover happens

Critical process crash

Up

Unreachable

Yes

Switchover happens

Forced switchover

Up

Unreachable

Yes

Switchover happens

Critical process crash

Down

Reachable

No

No action. One controller in recovery mode.

Forced switchover

Down

Reachable

N/A

No action. One controller in recovery mode.

Critical process crash

Down

Unreachable

No

Double fault – as mentioned in Network Error handling

Forced switchover

Down

Unreachable

N/A

Double fault – as mentioned in Network Error handling

RP Link

Peer Reachability Through RMI

Gateway From Active

Gateway From Standby

Switchover

Result

Up

Up

Reachable

Reachable

No

No action

Up

Up

Reachable

Unreachable

No

No action. Standby is not ready for SSO in this state, as it does not have gateway reachability. The standby is shown to be in standby-recovery mode. If the RP goes down, standby (in recovery mode) becomes active.

Up

Up

Unreachable

Reachable

Yes

Gateway reachability message is exchanged over the RMI + RP links. Active reboots so that the standby becomes active.

Up

Up

Unreachable

Unreachable

No

With this, when the active SVI goes down, the standby SVI also goes down. A switchover is then triggered. If the new active discovers its gateway to be reachable, the system stabilizes in the Active - Standby Recovery mode. Otherwise, switchovers happen in a ping-pong fashion.

Up

Down

Reachable

Reachable

No

No action

Up

Down

Reachable

Unreachable

No

Standby is not ready for SSO in this state as it does not have gateway reachability. Standby moves in to recovery mode as LMP messages are exchanged over the RP link.

Up

Down

Unreachable

Reachable

Yes

Gateway reachability message is exchanged over RP link. Active reboots so that standby becomes active.

Up

Down

Unreachable

Unreachable

No

With this, when the active SVI goes down, the standby SVI also goes down. A switchover is then triggered. If the new active discovers its gateway to be reachable, the system stabilizes in Active - Standby Recovery mode. Otherwise, switchovers happen in a ping-pong fashion.

Down

Up

Reachable

Reachable

Yes

Standby becomes active with (old) active going in to active-recovery mode. Configuration mode is disabled in active-recovery mode. All interfaces will be ADMIN DOWN with the wireless management interface having RMI IP. The controller in the active-recovery mode will reload to become standby when the RP link comes UP.

Down

Up

Reachable

Unreachable

Yes

Same as above.

Down

Up

Unreachable

Unreachable

Yes

Same as above.

Down

Up

Unreachable

Unreachable

Yes

Same as above.

Down

Down

Reachable

Reachable

Yes

Double fault – this may result in a network conflict as there will be two active controllers. Standby becomes active. Old active also exists. Role negotiation has to happen once the connectivity is restored and keep the active that came up last.

Down

Down

Reachable

Unreachable

Yes

Same as above.

Down

Down

Unreachable

Reachable

Yes

Same as above.

Down

Down

Unreachable

Unreachable

Yes

Same as above.

Verifying High Availability Configurations

To view the HA configuration details, use the following command:

Device# show romvar
ROMMON variables:
 LICENSE_BOOT_LEVEL =
 MCP_STARTUP_TRACEFLAGS = 00000000:00000000
 BOOTLDR =
 CRASHINFO = bootflash:crashinfo_RP_00_00_20180202-034353-UTC
 STACK_1_1 = 0_0
 CONFIG_FILE =
 BOOT = bootflash:boot_image_test,1;bootflash:boot_image_good,1;bootflash:rp_super_universalk9.vwlc.bin,1;
 RET_2_RTS =
 SWITCH_NUMBER = 1
 CHASSIS_HA_REMOTE_IP = 10.0.1.9
 CHASSIS_HA_LOCAL_IP = 10.0.1.10
 CHASSIS_HA_LOCAL_MASK = 255.255.255.0
 CHASSIS_HA_IFNAME = GigabitEthernet2
 CHASSIS_HA_IFMAC = 00:0C:29:C9:12:0B
 RET_2_RCALTS =
 BSI = 0
 RANDOM_NUM = 647419395

Verifying AP or Client SSO Statistics

To view the AP SSO statistics, use the following command:

Device# show wireless stat redundancy statistics ap-recovery wnc all
AP SSO Statistics                                                     

Inst    Timestamp     Dura(ms)   #APs  #Succ  #Fail  Avg(ms)  Min(ms)  Max(ms)
------------------------------------------------------------------------------
   0    00:06:29.042        98     34     34      0        2        1       35
   1    00:06:29.057        56     33     30      3        1        1       15
   2    00:06:29.070        82     33     33      0        2        1       13


Statistics:

WNCD Instance   : 0
No. of AP radio recovery failures          : 0
No. of AP BSSID recovery failures          : 0
No. of CAPWAP recovery failures            : 0
No. of DTLS recovery failures              : 0
No. of reconcile message send failed       : 0
No. of reconcile message successfully sent : 34
No. of Mesh BSSID recovery failures: 0
No. of Partial delete cleanup done : 0
.
.
.

To view the Client SSO statistics, use the following command:

Device# show wireless stat redundancy statistics client-recovery wncd all
Client SSO statistics                                                      
----------------------                                                     

WNCD instance  : 1
Reconcile messages received from AP                     : 1
Reconcile clients received from AP                      : 1
Recreate attempted post switchover                      : 1
Recreate attempted by SANET Lib                         : 0
Recreate attempted by DOT1x Lib                         : 0
Recreate attempted by SISF Lib                          : 0
Recreate attempted by SVC CO Lib                        : 1
Recreate attempted by Unknown Lib                       : 0
Recreate succeeded post switchover                      : 1
Recreate Failed post switchover                         : 0
Stale client entries purged post switchover             : 0

Partial delete during heap recreate                     : 0
Partial delete during force purge                       : 0
Partial delete post restart                             : 0
Partial delete due to AP recovery failure               : 0
Partial delete during reconcilation                     : 0

Client entries in shadow list during SSO                : 0
Client entries in shadow default state during SSO       : 0
Client entries in poison list during SSO                : 0

Invalid bssid during heap recreate                      : 0
Invalid bssid during force purge                        : 0
BSSID mismatch with shadow rec during reconcilation     : 0
BSSID mismatch with shadow rec reconcilation(WGB client): 0
BSSID mismatch with dot11 rec during heap recreate      : 0

AID mismatch with dot11 rec during force purge          : 0
AP slotid mismatch during reconcilation                 : 0
Zero aid during heap recreate                           : 0
AID mismatch with shadow rec during reconcilation       : 0
AP slotid mismatch shadow rec during reconcilation      : 0
Client shadow record not present                        : 0

To view the mobility details, use the following command:

Device# show wireless stat redundancy statistics client-recovery mobilityd
Mobility Client Deletion Reason Statistics
-------------------------------------------
Mobility Incomplete State         : 0
Inconsistency in WNCD & Mobility  : 0
Partial Delete                    : 0

General statistics
--------------------
Cleanup sent to WNCD, Missing Delete case   : 0

To view the Client SSO statistics for SISF, use the following command:

Device# show wireless stat redundancy statistics client-recovery sisf
Client SSO statistics for SISF
--------------------------------
Number of recreate attempted post switchover    : 1
Number of recreate succeeded post switchover    : 1
Number of recreate failed because of no mac     : 0
Number of recreate failed because of no ip      : 0
Number of ipv4 entry recreate success           : 1
Number of ipv4 entry recreate failed            : 0
Number of ipv6 entry recreate success           : 0
Number of ipv6 entry recreate failed            : 0
Number of partial delete received               : 0
Number of client purge attempted                : 0
Number of heap and db entry purge success       : 0
Number of purge success for db entry only       : 0
Number of client purge failed                   : 0
Number of garp sent                             : 1
Number of garp failed                           : 0
Number of IP entries validated in cleanup       : 0
Number of IP entry address errors in cleanup    : 0
Number of IP entry deleted in cleanup           : 0
Number of IP entry delete failed in cleanup     : 0
Number of IP table create callbacks on standby  : 0
Number of IP table modify callbacks on standby  : 0
Number of IP table delete callbacks on standby  : 0
Number of MAC table create callbacks on standby : 1
Number of MAC table modify callbacks on standby : 0
Number of MAC table delete callbacks on standby : 0

To view the HA redundancy summary, use the following command:

Device# show wireless stat redundancy summary
HA redundancy summary
---------------------

AP recovery duration (ms)        : 264
SSO HA sync timer expired        : No

Verifying High Availability

Table 3. Commands for Monitoring Chassis and Redundancy
Command Name Description
show chassis

Displays the chassis information.

Note 

When the peer timeout and retries are configured, the show chassis ha-status command output may show incorrect values.

To check the peer keep-alive timer and retries, use the following commands:

  • show platform software stack-mgr chassis active r0 peer-timeout

  • show platform software stack-mgr chassis standby r0 peer-timeout

show redundancy

Displays details about Active box and Standby box.

show redundancy switchover history

Displays the switchover counts, switchover reason, and the switchover time.

Information About Redundancy Management Interface

The Redundancy Management Interface (RMI) is used as a secondary link between the active and standby Cisco Catalyst 9800 Series Wireless Controllers. This interface is the same as the wireless management interface, and the IP address on this interface is configured in the same subnet as the Wireless Management IP. The RMI is used for the following purposes:

  • Dual Active Detection

  • Exchange resource health between controllers, for instance, gateway reachability status from either controller.

  • Gateway Reachability detection: Gateway reachability is checked on the active and the standby controller through the RMI interface when the feature is enabled. It takes approximately the configured gateway monitoring interval to detect that a controller has lost gateway reachability. The default gateway monitoring interval value is 8 seconds.


Note

The RMI might trigger a switchover based on the gateway status of the active controller.


Note

Cisco TrustSec (CTS) is not supported on the RMI interfaces.

When the device SGT is used, the IP-SGT mapping for RMI address is also applied along with the WMI address. So, you need to ensure that the SGACL is defined appropriately to allow ICMP and ARP traffic between the active and standby RMI addresses.


Note

If the RP and RMI links are down, the HA setup breaks into two active controllers. This leads to IP conflict in the network. The HA setup forms again when the RP link comes up. Depending on the state of the external switch at this time, the ARP table may or may not be updated to point to the Active controller. That is, the switch may fail to process the GARP packets from the controller. As a best practice, it is recommended to keep the ARP cache timeout to a lower value for faster recovery from multiple fault scenarios. You need to select a value that does not impact the network traffic, for instance, 30 minutes.

Active Controller

The primary address on the active controller is the management IP. The secondary IPv4 address on the management VLAN is the RMI IP for the active controller. Do not configure the secondary IPv4 addresses explicitly because a single secondary IPv4 address is configured automatically by RMI under the RMI interface.

Standby Controller

The standby controller does not have the wireless management IP configured; it has the RMI IP address configured as the primary IP address. When the standby controller becomes active, the management IP becomes the primary IP and the RMI IP becomes the secondary IP. If the interface on the active controller is administratively down, the same state is reflected on standby controller.

Dual Stack Support on Management VLAN with RMI

Dual stack refers to the fact that the wireless management interface can be configured with IPv4 and IPv6 addresses. If RMI IPv4 address is configured along with an IPv4 management IP, you can additionally configure an IPv6 management address on the wireless management interface. This IPv6 management IP will not be visible on the standby controller.

If RMI IPv6 address is configured along with an IPv6 management IP, you can additionally configure an IPv4 management address on the wireless management interface. This IPv4 management IP will not be visible on the standby controller.

Therefore, you can monitor only the IPv6 gateway when RMI IPv6 is configured (or) IPv4 gateway when RMI IPv4 is configured.


Note

The RMI feature supports RMI IPv4 or IPv6 addresses.

RMI-Based High-Availability Pairing

You should consider the following scenarios for High-Availability (HA) pairing:

  • Fresh Installation

  • Already Paired Controllers

  • Upgrade Scenario

  • Downgrade Scenario

Dynamic HA pairing requires both active controller and the standby controller to reload. However, dynamic HA pairing occurs on Cisco Catalyst 9800-40 Wireless Controller and Cisco Catalyst 9800-80 Wireless Controller when one of them reloads and becomes standby.


Note

Chassis numbers identify the individual controllers. Unique chassis numbers must be configured before forming an HA pair.

HA Pairing Without Previous Configuration

When HA pairing is done for the first time, no ROMMON variables are found for the RP IPs. You can choose from the existing privileged EXEC-mode RP-based CLIs or the RMI IP based mechanisms. However, the exec-mode RP-based CLIs will be deprecated soon. If you use the Cisco DNA Center, you can choose the exec-mode RP-based CLI mechanism till the Cisco DNA Center migrates to support the RMI method.

The RP IPs are derived from the RMI IPs after an HA pair is formed. Also, the privileged EXEC-mode RP-based CLI method of clearing and forming an HA pair is not allowed once the RMI IP based HA mechanism is chosen.


Note

Though you can choose RP or RMI for a fresh installation, we recommended that you use RMI install method.

Note

To view the ROMMON variables, use the following command:

show romvars

If you choose the exec-mode RP-based CLI mechanism, the RP IPs will be configured similar to the 16.12 release.

The following occurs when the RMI based HA pairing is done on a brand-new system:

  • RP IPs are derived from RMI IPs and used in HA pairing.

  • Exec-mode RP-based CLIs are blocked.

Already Paired Controllers

If the controllers are already in an HA pair, the existing exec-mode RP-based CLIs will continue to be used. You can enable RMI to migrate to the RMI based HA pairing.

If the controllers are already paired and RMI is configured, it will overwrite the RP IPs with the RMI derived IPs. The HA pair will not be disturbed immediately but the controllers will pick up the new IP when the next reload happens. RMI feature mandates a reload for the feature to be effective. When both controllers reload, they would come up as a pair with the new RMI derived RP IPs.

The following occurs when the RMI configuration is done:

  • The RP IPs derived from the RMI IPs are overwritten, and used for HA pairing.

  • If the active and standby already exists due to prior HA pairing through the exec-mode RP-based CLI mechanism, the pair will not be interrupted.

  • Whenever the pair reloads later, the new RP IPs are used.

  • Exec-mode RP-based CLIs are blocked.

Upgrading from Cisco IOS XE 16.1.x to a Later Release

A system that is being upgraded can choose to:

  • Migrate with the existing RP IP configuration intact—In this case, the existing RP IP configuration will continue to be used. The exec-mode RP-based CLIs are used for future modifications.

  • Migrate after clearing the HA configuration—In this case, you can choose between the old (exec-mode RP-based CLIs) and new RMI based RP configuration methods.


Note

In case the older configuration is retained, the RMI configuration updates the RP IPs with the IPs derived from the RMI IPs.

Downgrade Scenario


Note

The downgrade scenario given below is not applicable for Cisco IOS XE Amsterdam 17.1.x.

The downgrade scenario will have only the exec-mode RP-based CLIs. The following are the two possibilities:

  • If the upgraded system used the RMI based RP configuration.

  • If the upgraded system continued to use the exec-mode RP-based CLIs.


Note

In the above cases, the downgraded system uses the exec-mode RP-based CLIs to modify the configuration. However, the downgraded system will continue to use the new derived RP IPs.


Note

When you downgrade the Cisco Catalyst 9800 Series Wireless Controller to any version below 17.1 and if the mDNS gateway is enabled on the WLAN/RLAN/GLAN interfaces, the mdns-sd-interface gateway goes down after the downgrade.

To enable the mDNS gateway on the WLAN/RLAN/GLAN interfaces in 16.12 and lower versions, use the following commands:

wlan test 1 test

mdns-sd gateway

To enable the mDNS gateway on the WLAN/RLAN/GLAN interfaces from version 17.1 onwards, use the following command:

mdns-sd-interface gateway

Gateway Monitoring

From Cisco IOS XE Amsterdam 17.2.1 onwards, the method to configure the gateway IP has been modified. The ip default-gateway gateway-ip command is not used. Instead, the gateway IP is selected based on the static routes configured. From among the static routes configured, the gateway IP that falls in the same subnet as the RMI subnet (the broadest mask and least gateway IP) is chosen. If no matching static route is found, gateway failover will not work (even if management gateway-failover is enabled).

Prerequisites for RMI based HA Pairing

In RMI based HA pairing, it is mandatory to configure the Redundancy Management IP address and Peer Redundancy Management IP address before HA pairing happens. Both the interfaces must be in the same subnet as the Wireless Management Interface. If controller1 is configured with 9.10.90.147 as the Redundancy Management IP and controller2 with 9.10.90.149, you need to execute the following command in controller1 for redundancy mode:

redun-management interface Vlan vlan-interface-no chassis chassis-number address ip-address chassis chassis-number address ip-address


Note

The redun-management command needs to be configured on both the controllers prior to HA pairing. Here, the IP addresses 9.10.90.147 and 9.10.90.149 refer to the RMI IPs.

The chassis redundancy ha-interface GigabitEthernet interface-number command needs to be defined in Cisco Catalyst 9800-CL Cloud Wireless Controller. 


Device# conf t
Device(config)# redun-management interface Vlan Vlan90 chassis 1 address 9.10.90.147 chassis 2 9.10.90.149

Configuring Redundancy Management Interface (GUI)

Procedure

Step 1

In the Administration > Device > Redundancy window, perform the following:

  1. Set the Redundancy Configuration toggle button to Enabled to activate redundancy configuration.

  2. In the Redundancy Pairing Type field, select RMI+RP to perform RMI+RP redundancy pairing as follows:

    • In the RMI IP for Chassis 1 field, enter RMI IP address for chassis 1.

    • In the RMI IP for Chassis 2 field, enter RMI IP address for chassis 2.

    • From the HA Interface drop-down list, choose one of the HA interface.

      Note 

      You can select the HA interface only for Cisco Catalyst 9800 Series Wireless Controllers.

    • Set the Management Gateway Failover toggle button to Enabled to activate management gateway failover.

    • In the Gateway Failure Interval field, enter an appropriate value. The valid range is between 6 and 12 (seconds). The default is 8 seconds.

  3. In the Redundancy Pairing Type field, select RP to perform RP redundancy pairing as follows:

    • In the Local IP field, enter an IP address for Local IP.

    • In the Netmask field, enter the subnet mask assigned to all wireless clients.

    • From the HA Interface drop-down list, choose one of the HA interface.

      Note 

      You can select the HA interface only for Cisco Catalyst 9800 Series Wireless Controllers.

    • In the Remote IP field, enter an IP address for Remote IP.

  4. In the Keep Alive Timer field, enter an appropriate timer value. The valid range is between 1 and 10 (x100 milliseconds).

  5. In the Keep Alive Retries field, enter an appropriate retry value. The valid range is between 3 and 10 seconds.

  6. In the Active Chassis Priority field, enter a value.

Step 2

Click Apply.

Configuring a Redundancy Management Interface IP Address (CLI)

Procedure

  Command or Action Purpose
Step 1

chassis redundancy ha-interface GigabitEthernet interface-number

Example:

Device# chassis redundancy ha-interface GigabitEthernet 3

Creates an HA interface for your controller.

interface-number : GigabitEthernet interface number. The range is from 1 to 32.

Note 

This step is applicable only for Cisco Catalyst 9800-CL Series Wireless Controllers. The chosen interface is used as the dedicated interface for HA communication between the 2 controllers.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.
Step 3

redun-management interface vlan vlan-interface-number chassis chassis-number address ip-address chassis chassis-number address ip-address

Example:

Device(config)# redun-management interface Vlan 200 
chassis 1 address 9.10.90.147 chassis 2 address 9.10.90.149

Configures Redundancy Management Interface.

  • vlan-interface-number : VLAN interface number. The valid range is from 1 to 4094.

    Note 

    Here, the vlan-interface-number is the same VLAN as the Management VLAN. That is, both must be on the same subnet.

  • chassis-number : Chassis number. The valid range is from 1 to 2.

  • ip-address : Redundancy Management Interface IP address.

Note 

Each controller must have a unique chassis number for RMI to form the HA pair. The chassis number can be observed as SWITCH_NUMBER in the output of show romvar command. Modification of SWITCH_NUMBER is currently not available through the web UI.

The no redun-management interface vlan chassis command will disable the HA pair.

Step 4

end

Example:

Device(config)# end

Returns to privileged EXEC mode.

Note 

To save the configuration, use the write memory command.

Configuring Gateway Monitoring (CLI)

Procedure

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.
Step 2

[no] management gateway-failover enable

Example:

Device(config)# management gateway-failover enable

Enables gateway monitoring. (Use the no form of this command to disable gateway monitoring.)

Step 3

end

Example:

Device(config)# end

Returns to privileged EXEC mode.

Note 

To save the configuration, use the write memory command.

Configuring Gateway Monitoring Interval (CLI)

Procedure

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.
Step 2

management gateway-failover interval interval-value

Example:

Device(config)# management gateway-failover interval 6

Configures the gateway monitoring interval.

interval-value - Refers to the gateway monitoring interval. The valid range is from 6 to 12. Default value is 8.

Step 3

end

Example:

Device(config)# end

Saves the configuration and exits configuration mode and returns to privileged EXEC mode.

Gateway Reachability Detection

Information About Gateway Reachability Detection

Gateway Reachability Detection feature mimimizes the downtime on APs and clients when the gateway reachability is lost on the active controller.

Both active and standby controllers keep track of gateway reachability. The gateway reachability is detected by sending Internet Control Message Protocol (ICMP) and ARP requests periodically to the gateway.

Both active and standby controllers use the RMI IP as the source IP. The messages are sent at 1 second interval. If it takes 8 (or configured value) consecutive failures in reaching the gateway, the controller declares the gateway as non-reachable. It takes approximately 8 seconds to detect if a controller has lost gateway reachability.

Gateway monitoring with native IPv6 uses ICMP Neighbour Discovery protocols and ICMPv6 ECHO to check gateway reachability.

Therefore, you can monitor only the IPv6 gateway when RMI IPv6 is configured.

This means that only one IPv4 or IPv6 gateways can be monitored.


Note

If the standby controller loses gateway, the standby moves to the standby recovery mode.

If the active controller loses gateway, the active reloads and standby becomes active.

Migrating to RMI IPv6

From RMI IPv4

  1. Unconfigure the RMI IPv4 using the following CLIs:

    
Device# conf t
Device(config)# no redun-management interface <vlan_name> chassis 1 address <ip_address1> chassis 2 address <ip_address2>

    Note

    This CLI unconfigures RMI on both the controllers.

  2. Note

    Take a backup of the running config on active before you reload the controller.

    Reload the controller.

  3. Copy the backed up config to the running config on the box which would have lost all the config.

  4. Configure the RMI IPv6 on both the controllers. For information on the CLI, see Configuring a Redundancy Management Interface IP Address (CLI).

  5. Reload the controller.

From HA Pairing (Without RMI)

For information on HA pairing, see Configuring Redundancy Management Interface (GUI).

Monitoring the Health of Standby Controller

The Standby Monitoring feature allows you to monitor the health of a system on a standby controller using programmatic interfaces and CLIs. This feature allows you to monitor parameters such as CPU, memory, interface status, power supply, fan failure, and the system temperature. Standby Monitoring is enabled when Redundancy Management Interface (RMI) is configured, no other configuration is required. The RMI itself is used to connect to the standby and perform standby monitoring. Standby Monitoring feature cannot be dynamically enabled or disabled.

To enable standby console, ensure that the following configuration is in place:

redundancy
main-cpu
secondary console enable

Note

The Standby Monitoring feature is not supported on a controller in the active-recovery and the standby-recovery modes.

The Standby Monitoring feature supports only the following traffic on the RMI interface of the standby controller:

  • Address Resolution Protocol (ARP)

  • Internet Control Message Protocol (ICMP)

  • TCP Traffic (to or from) ports: 22, 443, 830, and 3200

  • UDP RADIUS ports:1645 and1646

  • UDP Extended RADIUS ports: 21645 to 21844

Feature Scenarios

  • To monitor the health of the standby directly from the standby controller using Standby RMI IP.

  • To get syslogs from the standby controller using the Standby RMI IP.

Use Cases

  • Enabling SNMP agent and programmatic interfaces on the standby controller: You can directly perform an SNMP query or programmatic interface query to the standby’s RMI IP and active controller.

  • Enabling syslogs on the standby controller: You can directly get the standby syslogs from the standby controller.

Monitoring the Health of Standby Parameters using SNMP

Standby Monitoring using Standby RMI IP

When an SNMP agent is enabled on standby, you can directly perform an SNMP query to the standby’s RMI IP. From 17.5 onwards, you can query the following MIB on standby:

Table 4. MIB Name and Notes

MIB Name

Notes

IF-MIB

This MIB is used to monitor interface statistics of the standby controller using the standby RMI IP.

Note

If an SNMP agent is enabled on active then by default the SNMP is enabled on standby.

Standby Monitoring using Active

CISCO-LWAPP-HA-MIB

The CISCO-LWAPP-HA-MIB monitors the health parameters of the standby controller, that is, memory, CPU, port status, power statistics, peer gateway latencies, and so on.

You can query the following MIB objects of CISCO-LWAPP-HA-MIB:

Table 5. MIB Objects and Notes

MIB Objects

Notes

cLHaPeerHotStandbyEvent

This object can be used to check if the standby has turned hot-standby or not.

cLHaBulkSyncCompleteEvent

This object represents the time when the bulksync completed.

CISCO-PROCESS-MIB

The CISCO-PROCESS-MIB monitors CPU and process statistics. It can be used to monitor CPU or memory related BINOS processes. Standby CISCO-PROCESS-MIB can be monitored using the active controller.

ENTITY-MIB

The ENTITY-MIB is used to monitor hardware details of the active and standby controller using the active controller.


Note

The standby Route Processor (RP) sensors are appended in the Active RP sensors.

Standby IOS Linux Syslogs

The Standby logs are relayed using the same method as on the active IOS for wireless controllers.

From 17.5 release onwards, the external logging of syslogs from standby IOS is enabled. As BINOS processes on standby also forwards the syslogs to IOS, all syslogs generated on standby is forwarded to the configured external server.


Note

RMI IP is used for logging purpose.

Note

The following is the expected behavior when HA pair is configured with RMI IPv6, Active has dual stack, and logging is configured on IPv4:

Standby tries to send syslogs to IPv4 server as logging is only configured on IPv4 even though IPv4 is not supported by standby.

Monitoring the Health of Standby Controller Using Programmatic Interfaces

You can monitor parameters such as CPU, memory, sensors, and interface status on a standby controller using programmatic interfaces such as NetConf and RestConf. The RMI IP of the standby controller can be used for access to the following operational models:

The models can be accessed through .

  • Cisco-IOS-XE-device-hardware-oper.yang

  • Cisco-IOS-XE-process-cpu-oper.yang

  • Cisco-IOS-XE-platform-software-oper.yang

  • Cisco-IOS-XE-process-memory-oper.yang

  • Cisco-IOS-XE-interfaces-oper.yang

For more information on the YANG models, see the Programmability Configuration Guide, Cisco IOS XE Amsterdam 17.3.x.

Monitoring the Health of Standby Controller Using CLI

This section describes the different commands that can be used to monitor the standby device.

You can connect to the standby controller through SSH using the RMI IP of the standby controller. The user credentials must have been configured already. Both local authentication and RADIUS authentication are supported.


Note

The redun-management command needs to be configured on both the controllers, primary and standby, prior to high availability (HA) pairing.

Monitoring Port State

The following is a sample output of the show interfaces interface-name command: 

Device-standby# show interfaces GigabitEthernet1        

GigabitEthernet1 is down, line protocol is down                                 
Shadow state is up, true line protocol is up
  Hardware is CSR vNIC, address is 000c.2909.33c2 (bia 000c.2909.33c2)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1000Mbps, link type is force-up, media type is Virtual
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:06, output 00:00:24, output hang never
  Last clearing of "show interface" counters never
  Input queue: 30/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 389000 bits/sec, 410 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     3696382 packets input, 392617128 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     18832 packets output, 1218862 bytes, 0 underruns
     Output 0 broadcasts (0 multicasts)
     0 output errors, 0 collisions, 2 interface resets
     3 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

The following is a sample output of the show ip interface brief command: 

Device# show ip interface brief

Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet1       unassigned      YES unset  down                  down    
GigabitEthernet0       unassigned      YES NVRAM  administratively down down    
Capwap1                unassigned      YES unset  up                    up      
Capwap2                unassigned      YES unset  up                    up      
Capwap3                unassigned      YES unset  up                    up           
Capwap10               unassigned      YES unset  up                    up      
Vlan1                  unassigned      YES NVRAM  down                  down    
Vlan56                 unassigned      YES unset  down                  down    
Vlan111                111.1.1.85      YES NVRAM  up                    up

Monitoring CPU / Memory

The following is a sample output of the show process cpu sorted 5sec command: 

Device-standby# show process cpu sorted 5sec

CPU utilization for five seconds: 0%/0%; one minute: 0%; five minutes: 0%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process 
  10     1576556      281188       5606  0.15%  0.05%  0.05%   0 Check heaps      
 232      845057    54261160         15  0.07%  0.05%  0.06%   0 IPAM Manager     
 595         177         300        590  0.07%  0.02%  0.01%   2 Virtual Exec     
 138     1685973   108085955         15  0.07%  0.08%  0.08%   0 L2 LISP Punt Pro 
 193       19644      348767         56  0.07%  0.00%  0.00%   0 DTP Protocol     
   5           0           1          0  0.00%  0.00%  0.00%   0 CTS SGACL db cor 
   4          24          15       1600  0.00%  0.00%  0.00%   0 RF Slave Main Th 
   6           0           1          0  0.00%  0.00%  0.00%   0 Retransmission o 
   7           0           1          0  0.00%  0.00%  0.00%   0 IPC ISSU Dispatc 
   2      117631      348801        337  0.00%  0.00%  0.00%   0 Load Meter       
   8           0           1          0  0.00%  0.00%  0.00%   0 EDDRI_MAIN

To check CPU and memory utilization of binos processes, use the following command:

Device-standby# show platform software process slot chassis standby R0 monitor 

top - 23:24:14 up 8 days, 3:38, 0 users, load average: 0.69, 0.79, 0.81 
Tasks: 433 total, 1 running, 431 sleeping, 1 stopped, 0 zombie 
%Cpu(s): 1.7 us, 2.8 sy, 0.0 ni, 95.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 32059.2 total, 21953.7 free, 4896.8 used, 5208.6 buff/cache 
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 26304.6 avail Mem 

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23565 root 20 0 2347004 229116 130052 S 41.2 0.7 5681:44 ucode_pkt+
2306 root 20 0 666908 106760 46228 S 5.9 0.3 15:06.14 smand 
22807 root 20 0 3473004 230020 152120 S 5.9 0.7 510:56.90 fman_fp_i+
1 root 20 0 14600 11324 7424 S 0.0 0.0 0:31.07 systemd 
2 root 20 0 0 0 0 S 0.0 0.0 0:00.28 kthreadd 
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp 
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker/0+
7 root 20 0 0 0 0 I 0.0 0.0 0:00.49 kworker/u+
8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu+
9 root 20 0 0 0 0 S 0.0 0.0 0:03.26 ksoftirqd+
.
.
.
32258 root 20 0 57116 3432 2848 S 0.0 0.0 0:00.00 rotee
32318 root 20 0 139560 9500 7748 S 0.0 0.0 0:55.67 pttcd
32348 root 20 0 31.6g 3.1g 607364 S 0.0 9.8 499:12.04 linux_ios+
32503 root 20 0 3996 3136 2852 S 0.0 0.0 0:00.00 stack_snt+
32507 root 20 0 3700 1936 1820 S 0.0 0.0 0:00.00 sntp

Monitoring Hardware

The following is a sample output of the show environment summary command:


Note

The command displays both active and standby hardware details.

Note

The show environment summary command displays data only for physical appliances such as Cisco Catalyst 9800-80 Wireless Controller, Cisco Catalyst 9800-40 Wireless Controller, Cisco Catalyst 9800-L Wireless Controller, and Cisco Catalyst 9800 Embedded Wireless Controller for Switch. The command does not display data for Cisco Catalyst 9800 Wireless Controller for Cloud. 

Device# show environment summary


Number of Critical alarms:  0
Number of Major alarms:     0
Number of Minor alarms:     0

 Slot        Sensor          Current State   Reading        Threshold(Minor,Major,Critical,Shutdown)
 ----------  --------------  --------------- ------------   ---------------------------------------
 P0          Vin             Normal          231  V AC   	na
 P0          Iin             Normal          2    A      	na
 P0          Vout            Normal          12   V DC   	na
 P0          Iout            Normal          30   A      	na
 P0          Temp1           Normal          25   Celsius	(na ,na ,na ,na )(Celsius)
 P0          Temp2           Normal          31   Celsius	(na ,na ,na ,na )(Celsius)
 P0          Temp3           Normal          37   Celsius	(na ,na ,na ,na )(Celsius)
 R0          VDMB1: VX1      Normal          1226 mV     	na
 R0          VDMB1: VX2      Normal          6944 mV     	na
 R0          VDMB1: VX3      Normal          1226 mV     	na
 R0          VDMB1: VX4      Normal          1000 mV     	na
 R0          VDMB1: VP1      Normal          1789 mV     	na
 R0          VDMB1: VP2      Normal          2555 mV     	na
 R0          VDMB1: VP3      Normal          2556 mV     	na
 R0          VDMB1: VP4      Normal          1049 mV     	na
 R0          VDMB1: VH       Normal          11993mV     	na
 R0          VDMB2: VX2      Normal          4975 mV     	na
 R0          VDMB2: VX3      Normal          853  mV     	na
 R0          VDMB2: VX4      Normal          907  mV     	na
 R0          VDMB2: VX5      Normal          1008 mV     	na
 R0          VDMB2: VP1      Normal          1787 mV     	na
 R0          VDMB2: VP2      Normal          3323 mV     	na
 R0          VDMB2: VH       Normal          12003mV     	na
 R0          VDMB3: VX1      Normal          968  mV     	na
 R0          VDMB3: VX2      Normal          1002 mV     	na
 R0          VDMB3: VX5      Normal          5090 mV     	na
 R0          VDMB3: VP1      Normal          2492 mV     	na
 R0          VDMB3: VP2      Normal          1196 mV     	na
 R0          VDMB3: VP3      Normal          1512 mV     	na
 R0          VDMB3: VP4      Normal          1509 mV     	na
 R0          VDMB3: VH       Normal          11998mV     	na
 R0          Temp: DMB IN    Normal          26   Celsius	(45 ,55 ,65 ,70 )(Celsius)
 R0          Temp: DMB OUT   Normal          40   Celsius	(70 ,75 ,80 ,85 )(Celsius)
 R0          Temp: Yoda 0    Normal          54   Celsius	(95 ,105,110,115)(Celsius)
 R0          Temp: Yoda 1    Normal          62   Celsius	(95 ,105,110,115)(Celsius)
 R0          Temp: CPU Die   Normal          43   Celsius	(100,110,120,125)(Celsius)
 R0          Temp: FC FANS   Fan Speed 70%   26   Celsius	(29 ,39 ,0  )(Celsius)
 R0          VDDC1: VX1      Normal          1005 mV     	na
 R0          VDDC1: VX2      Normal          7084 mV     	na
 R0          VDDC1: VX3      Normal          950  mV     	na
 R0          VDDC1: VP1      Normal          1800 mV     	na
 R0          VDDC1: VP2      Normal          2493 mV     	na
 R0          VDDC1: VP3      Normal          3325 mV     	na
 R0          VDDC1: VH       Normal          12019mV     	na
 R0          VDDC2: VX2      Normal          751  mV     	na
 R0          VDDC2: VX3      Normal          749  mV     	na
 R0          VDDC2: VX5      Normal          5076 mV     	na
 R0          VDDC2: VP1      Normal          1009 mV     	na
 R0          VDDC2: VP2      Normal          1008 mV     	na
 R0          VDDC2: VP3      Normal          1197 mV     	na
 R0          VDDC2: VP4      Normal          1514 mV     	na
 R0          VDDC2: VH       Normal          12003mV     	na
 R0          Temp: DDC IN    Normal          25   Celsius	(55 ,65 ,75 ,80 )(Celsius)
 R0          Temp: DDC OUT   Normal          35   Celsius	(75 ,85 ,95 ,100)(Celsius)
 P0          Stby Vin        Normal          230  V AC   	na
 P0          Stby Iin        Normal          2    A      	na
 P0          Stby Vout       Normal          12   V DC   	na
 P0          Stby Iout       Normal          32   A      	na
 P0          Stby Temp1      Normal          24   Celsius	(na ,na ,na ,na )(Celsius)
 P0          Stby Temp2      Normal          29   Celsius	(na ,na ,na ,na )(Celsius)
 P0          Stby Temp3      Normal          35   Celsius	(na ,na ,na ,na )(Celsius)
 R0          Stby VDMB1: VX1 Normal          1225 mV     	na
 R0          Stby VDMB1: VX2 Normal          6979 mV     	na
 R0          Stby VDMB1: VX3 Normal          1226 mV     	na
 R0          Stby VDMB1: VX4 Normal          999  mV     	na
 R0          Stby VDMB1: VP1 Normal          1791 mV     	na
 R0          Stby VDMB1: VP2 Normal          2560 mV     	na
 R0          Stby VDMB1: VP3 Normal          2558 mV     	na
 R0          Stby VDMB1: VP4 Normal          1050 mV     	na
 R0          Stby VDMB1: VH  Normal          11977mV     	na
 R0          Stby VDMB2: VX2 Normal          5005 mV     	na
 R0          Stby VDMB2: VX3 Normal          854  mV     	na
 R0          Stby VDMB2: VX4 Normal          878  mV     	na
 R0          Stby VDMB2: VX5 Normal          1008 mV     	na
 R0          Stby VDMB2: VP1 Normal          1789 mV     	na
 R0          Stby VDMB2: VP2 Normal          3312 mV     	na
 R0          Stby VDMB2: VH  Normal          11977mV     	na
 R0          Stby VDMB3: VX1 Normal          972  mV     	na
 R0          Stby VDMB3: VX2 Normal          1001 mV     	na
 R0          Stby VDMB3: VX5 Normal          5060 mV     	na
 R0          Stby VDMB3: VP1 Normal          2497 mV     	na
 R0          Stby VDMB3: VP2 Normal          1199 mV     	na
 R0          Stby VDMB3: VP3 Normal          1510 mV     	na
 R0          Stby VDMB3: VP4 Normal          1511 mV     	na
 R0          Stby VDMB3: VH  Normal          11982mV     	na
 R0          Stby Temp: DMB INormal          22   Celsius	(45 ,55 ,65 ,70 )(Celsius)
 R0          Stby Temp: DMB ONormal          32   Celsius	(70 ,75 ,80 ,85 )(Celsius)
 R0          Stby Temp: Yoda Normal          43   Celsius	(95 ,105,110,115)(Celsius)
 R0          Stby Temp: Yoda Normal          45   Celsius	(95 ,105,110,115)(Celsius)
 R0          Stby Temp: CPU DNormal          33   Celsius	(100,110,120,125)(Celsius)
 R0          Stby Temp: FC FAFan Speed 70%   22   Celsius	(29 ,39 ,0  )(Celsius)
 R0          Stby VDDC1: VX1 Normal          1005 mV     	na
 R0          Stby VDDC1: VX2 Normal          7070 mV     	na
 R0          Stby VDDC1: VX3 Normal          949  mV     	na
 R0          Stby VDDC1: VP1 Normal          1814 mV     	na
 R0          Stby VDDC1: VP2 Normal          2501 mV     	na
 R0          Stby VDDC1: VP3 Normal          3331 mV     	na
 R0          Stby VDDC1: VH  Normal          11993mV     	na
 R0          Stby VDDC2: VX2 Normal          752  mV     	na
 R0          Stby VDDC2: VX3 Normal          750  mV     	na
 R0          Stby VDDC2: VX5 Normal          5052 mV     	na
 R0          Stby VDDC2: VP1 Normal          1009 mV     	na
 R0          Stby VDDC2: VP2 Normal          994  mV     	na
 R0          Stby VDDC2: VP3 Normal          1195 mV     	na
 R0          Stby VDDC2: VP4 Normal          1514 mV     	na
 R0          Stby VDDC2: VH  Normal          11993mV     	na
 R0          Stby Temp: DDC INormal          22   Celsius	(55 ,65 ,75 ,80 )(Celsius)
 R0          Stby Temp: DDC ONormal          28   Celsius	(75 ,85 ,95 ,100)(Celsius)

Verifying the Gateway-Monitoring Configuration

To verify the status of the gateway-monitoring configuration on an active controller, use the following command:

Device# show redundancy states

my state = 13 -ACTIVE
peer state = 8 -STANDBY HOT
Mode = Duplex
Unit = Primary
Unit ID = 1

Redundancy Mode (Operational) = sso
Redundancy Mode (Configured) = sso
Redundancy State = sso
Maintenance Mode = Disabled
Manual Swact = enabled
Communications = Up

client count = 129
client_notification_TMR = 30000 milliseconds
RF debug mask = 0x0
Gateway Monitoring = Disabled
Gateway monitoring interval = 8 secs

To verify the status of the gateway-monitoring configuration on a standby controller, use the following command:

Device-stby# show redundancy states

my state = 8 -STANDBY HOT
peer state = 13 -ACTIVE
Mode = Duplex
Unit = Primary
Unit ID = 2

Redundancy Mode (Operational) = sso
Redundancy Mode (Configured) = sso
Redundancy State = sso
Maintenance Mode = Disabled
Manual Swact = cannot be initiated from this the standby unit
Communications = Up

client count = 129
client_notification_TMR = 30000 milliseconds
RF debug mask = 0x0
Gateway Monitoring = Disabled
Gateway monitoring interval = 8 secs

Verifying the RMI IPv4 Configuration

To verify the interface configuration for an active controller, use the following command:

Device# show running-config interface vlan management-vlan

Building configuration...

Current configuration : 109 bytes
!
interface Vlan90
ip address 9.10.90.147 255.255.255.0 secondary
ip address 9.10.90.41 255.255.255.0
end

To verify the interface configuration for a standby controller, use the following command:

Device-stby# show running-config interface vlan 90

Building configuration...
 
Current configuration : 62 bytes
!
interface Vlan90
ip address 9.10.90.149 255.255.255.0
end

To verify the chassis redundancy management interface configuration for an active controller, use the following command:

Device# show chassis rmi

Chassis/Stack Mac Address : 000c.2964.1eb6 - Local Mac Address
Mac persistency wait time: Indefinite
			H/W Current
Chassis# Role      Mac Address     Priority  Version  State  IP             RMI-IP
--------------------------------------------------------------------------------------------------------
*1       Active    000c.2964.1eb6  1         V02      Ready  169.254.90.147 9.10.90.147
2        Standby   000c.2975.3aa6  1         V02      Ready  169.254.90.149 9.10.90.149

To verify the chassis redundancy management interface configuration for a standby controller, use the following command:

Device-stby# show chassis rmi

Chassis/Stack Mac Address : 000c.2964.1eb6 - Local Mac Address
Mac persistency wait time: Indefinite
                                             H/W   Current
Chassis#   Role    Mac Address     Priority Version  State  IP              RMI-IP
------------------------------------------------------------------------------------------------
1         Active   000c.2964.1eb6     1      V02     Ready  169.254.90.147  9.10.90.147
*2        Standby  000c.2975.3aa6     1      V02     Ready  169.254.90.149  9.10.90.149

To verify the ROMMON variables on an active controller, use the following command:

Device# show romvar | include RMI

RMI_INTERFACE_NAME = Vlan90
RMI_CHASSIS_LOCAL_IP = 9.10.90.147
RMI_CHASSIS_REMOTE_IP = 9.10.90.149

To verify the ROMMON variables on a standby controller, use the following command:

Device-stby# show romvar | include RMI

RMI_INTERFACE_NAME = Vlan90
RMI_CHASSIS_LOCAL_IP = 9.10.90.149
RMI_CHASSIS_REMOTE_IP = 9.10.90.147

To verify the switchover reason, use the following command:

Device# show redundancy switchover history

Index  Previous  Current  Switchover             Switchover
       active    active   reason                 time
-----  --------  -------  ----------             ----------
   1       2        1     Active lost GW         17:02:29 UTC Mon Feb 3 2020

Verifying the RMI IPv6 Configuration

To verify the chassis redundancy management interface configuration for both active and standby controllers, use the following command: 

Device# show chassis rmi

Chassis/Stack Mac Address : 00a3.8e23.a540 - Local Mac Address
Mac persistency wait time: Indefinite
Local Redundancy Port Type: Twisted Pair
                                             H/W   Current
Chassis#   Role     Mac Address    Priority Version State     IP             RMI-IP
---------------------------------------------------------------------------------------------
  1        Standby  706d.1536.23c0    1      V02     Ready  169.254.254.17   2020:0:0:1::211
 *2        Active   00a3.8e23.a540    1      V02     Ready  169.254.254.18   2020:0:0:1::212

To verify the RMI related ROMMON variables for both active and standby controllers, use the following command

Device# show romvar | i RMI

RMI_INTERFACE_NAME = Vlan52
RMI_CHASSIS_LOCAL_IPV6 = 2020:0:0:1::212
RMI_CHASSIS_REMOTE_IPV6 = 2020:0:0:1::211

Information About Auto-Upgrade

The Auto-Upgrade feature enables the standby controller to upgrade with the software image of the active controller so that both controllers form an HA pair.


Note

  • This feature supports the active controller in INSTALL mode.

  • This feature supports Cisco Catalyst 9800 Series Wireless Controller software versions 17.5.1 and later.

  • This feature is triggered in the standby controller only when the active image is in committed state.

Use Cases

The following are the use cases and functionalities supported by the Auto-Upgrade feature:

  • Handling software version mismatch: During an upgrade, if one of the redundancy port is upgraded to a newer version, and the other one is not upgraded at the same time, the active port tries to copy its packages to the other port using the Auto-Upgrade feature. You can enable Auto-Upgrade in this situation using configuration or by manually running the software auto-upgrade enable privileged EXEC command.

    The auto-upgrade configuration is enabled by default.


    Note

    Auto-upgrade upgrades the mismatched redundancy port only when both the active redundancy port and the mismatched redundancy port are in INSTALL mode.

  • HA pair: If one of the controller is not upgraded successfully, use Auto-Upgrade to upgrade the controller on the newly deployed HA pair, which can each be a different version.

  • SMUs (APSP, APDP, and so on): If the SMUs that are successfully installed on the active controller when the standby controller was offline. In this scenario, when the standby controller comes up online, the Auto-Upgrade copies this SMU to the standby controller and installs it.

Configuring Auto-Upgrade (CLI)

Procedure

  Command or Action Purpose
Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.
Step 2

software auto-upgrade enable

Example:

Device(config)# software auto-upgrade enable

Enables the Auto-Upgrade feature. (This feature is enabled by default.)

If you disable this feature using the no form of this command, you need to manually auto upgrade using the install autoupgrade command in privileged EXEC mode.

Step 3

end

Example:

Device(config)# end

Returns to privileged EXEC mode.

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