Switch# show. Cisco 5500 Series WLCs . 2(20)EWA and later releases. The mode sso command can be entered only from within redundancy configuration mode. while restarting the secondary WLC that was in maintenance mode, check the "Bulksync status" of redundancy summary in primary WLC and wait for until it turn as. Step 6. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the to support SSO mode. mode sso. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Redundancy Mode (Configured) = sso Redundancy State = sso Maintenance Mode = Disabled Manual Swact = enabled Communications = Up client count = 115Enters global configuration mode. Step 5. 5. ”. end. Verifies that SSO is enabled. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. NSF and SSO must be configured before attempting an ISSU. Switch # show redundancy Redundant System Information : ----- Available system uptime = 6 days, 9 hours, 23 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = not known Hardware Mode = Simplex Configured Redundancy Mode = SSO Operating Redundancy Mode = SSO Maintenance Mode =. Step 5: exit. HANDY#show redundancy Redundant System Information : ----- Available system uptime = 1 hour, 50 minutes Switchovers system experienced = 2 Standby failures = 0 Last switchover reason = active unit removed Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. When the controller works as a host for spanning tree, ensure that you configure portfast trunk in the uplink switch using. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to privileged EXEC mode. Redundancy may not work due to differences between the Cisco. Maintenance Mode = Disabled. 48. The DHCP high availability features are enabled by default when the redundancy mode of operation is set to SSO. SSO is supported in Cisco IOS Release 12. Redundant System Information :-----Available system uptime = 1 year, 49 weeks, 6 days, 20 hours, 30 minutes Switchovers system experienced = 2 Standby failures = 6 Last switchover reason = active unit removed. Returns to EXEC mode. Step 4. Configuring Route Processor Redundancy SSO Mode configure terminal redundancy mode sso main-cpu standby. Enters redundancy configuration mode. Step 6 . HSRP is SSO aware on interfaces that are configured for HSRP and the standby RP is automatically reset. (Operational) = sso Redundancy Mode. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Stateful Switchover enabled routers will always checkpoint line card. Step 3 Perform write memory. In Cisco Wireless LAN Controllers, high availability is achieved with redundancy. To do this, we will use “redundancy” command under global configuration mode and after that we will select mode with “mode sso” command. Step 6. end. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. If active supervisor fails, then standby sup will perform following in sequence: Layer3 protocol initialized, routing tables. There are two options for Cisco Wireless Controller redundancy solutions, either Backup Controllers or High Availability, depending on the firmware version of WLC's, failover time requirement, and budget. Example: Device(config-red)# mode sso: Configures stateful switchover. Redundancy may not work due to differences between the Cisco. Redundancy-MGNT: 192. Remove SSO HA Configuration: 5. Check if Auto-Boot is Enabled 6. x（Catalyst 9200 スイッチ）コマンドリファレンス. 2(20)EWA and later releases. The mode sso command can be entered only from within redundancy configuration mode. 3SE (Catalyst 3850 Switches) 8 OL-30686-01. and the redundant supervisor engine boots into a partially-initialized state in RPR mode and a fully-initialized state in SSO mode. 除了這些IP地址外. Step 5. Are these switches setup in this manner by default? Can the redundancy be disabled if I am not going to use redundancy? What are the commands to disable redundancy? switch 1 provision ws-c3850-48p. mode sso. High availability SSO is setup and is working good. (Optional) Ensure network. Router# show redundancy Redundant System Information : ----- Available system uptime = 39 minutes Switchovers system experienced = 1 Standby failures = 0 Last switchover reason = user forced Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled. Redundancy Mode = SSO ENABLED. Router(config-red)# end. Active WLC 上で SSO の mode を disable にする. After changing the license boot level in sso, you only need to restart the standby engine. The switch is. Cisco SSO (frequently used with NSF) minimizes the time a network is unavailable to its users following a switchover while continuing to forward IP packets. Router(config-red)# end. And the output of the "show redundancy" is: Hardware Mode = Duplex. If SSO mode cannot be established between the active and standby switches because of an incompatibility in the configuration file, a mismatched command list (MCL) is generated at the active switch and a reload into route processor redundancy (RPR) mode is forced for the standby switch. Configures SSO. configure redundancy mode sso. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. 1. The following guidelines and restrictions apply to supervisor engine redundancy: •If SSO mode cannot be established between the active and standby supervisor engines because of an incompatibility in the configuration file, a mismatched command list (MCL) is generated at the active supervisor engine and a reload into RPR. Router# show redundancy states. Step 2. x. Router# show redundancy Redundant System Information : ----- Available system uptime = 39 minutes Switchovers system experienced = 1 Standby failures = 0 Last switchover reason = user forced Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled. end. 2(20)EWA and later releases. To do this, we will use “redundancy” command under global configuration mode and after that we will select mode with “mode sso” command. Cisco SSO (frequently used with NSF) minimizes the time a network is unavailable to its users following a switchover while continuing to forward IP packets. Catalyst 4500/4500-X series switches' VSS does not support route processor redundancy (RPR) mode. Description. mode SSO 5. Cisco SSO Operation. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Enter configuration commands, one per line. The mode sso command can be entered only from within redundancy configuration mode. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the switches in the stack to support SSO mode. This command has no. What is stateful switch over? Stateful Switchover (SSO) is a redundancy feature that allows a Cisco device with two route processors to synchronise router configuration and control plane state information. If I enter SSO mode on the second node I got an error: >config redundancy mode sso WARNING: 1. 255. The primary will reboot to enable sso and pull the config from the current active (secondary in this case) unit xml on boot. Example: Device(config-red)# end: Exits redundancy configuration mode and. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating. 1. Step 2. Configured Redundancy. show redundancy >>>>>> check here for mode you have configured. Note Use the show redundancy and show issu state commands throughout the upgrade to verify the status of the upgrade. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. . Cisco 5520 wireless LAN controller has a failover RP Port. Step 5: end. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine. Step 2: mode sso. SSO pair connected to upstream HSRP active and standby and RP connected via upstream setNow, let’s focus on Cisco SSO Configuration and learn how to configure SSO on Cisco routers. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating mode. 61 /24. With RPR, the backup supervisor engine is partially initialized and. Step 2. The First Sign Of Life (FSOL) triggers that are supported on SSO include DHCP proxy (where the iWAG acts as the DHCP proxy server) and DHCP. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. The mode sso command can be entered only from within redundancy configuration mode. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to privileged EXEC mode. (Optional) Backup the Startup Config and Running Config files of the controllers. . Example: Router(config)# exit Example: Router # Enters redundancy configuration mode. Step 5. The Broadband High Availability Stateful Switchover feature allows you to configure subscriber redundancy policies that tune the synchronization process. Running the Supervisor card in RPR or SSO operating mode enables Supervisor redundancy. Step 4. Step 4: mode sso. Step 4. Further, if the active RP fails, no change occurs to the HSRP group itself and traffic continues to be forwarded through the current active gateway device. HSRP is SSO aware on interfaces that are configured for HSRP and the standby RP is automatically reset. Configuration Examples for DHCP High Availability. Table 13-5 Redundancy Modes, Platform Support, and. What is SSO switchover? 5. Configures SSO. SSO is supported in Cisco IOS Release 12. x [S2C-build-v16x_throttle-4064-/. When two versions of Cisco IOS images are involved, the command sets supported by two images might differ. Switch(config-red)# mode sso. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. mode sso. To enable Cisco StackWise Virtual on a switch, use the stackwise-virtual command in the global configuration mode. reload Table 7-3 Software Redundancy Options for Cisco ASR 1002 and 1004 Routers Router Default HA Setting Options with 2 GB or DRAM Options with 4 GB or DRAM Cisco ASR 1002 Router None None None, RPR, SSO Cisco ASR 1004 Router None None None, RPR, SSO3) Issue the reset system. 12. Enters redundancy configuration mode. Check if Auto-Boot is Enabled 6. Router# copy running. 1. 3. main-cpu. 6. Redundancy may not work due to differences between the Cisco IOS. Enters redundancy configuration mode. Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled Communications = Up Current Processor Information :-----Active Location = slot 5 Current Software state = ACTIVE Uptime in current state = 6 days, 5 hours, 28 minutes Image Version = Cisco IOS Software, Catalyst L3 Switch Software Cisco NSF は、SSO 対応のデバイスにおけるルーティング フラップを抑止することによって、ネットワークの安定性を保ちます。 Cisco NSF と SSO により、スイッチオーバー後にルーティング プロトコル情報が復元される間も、既知のルートでデータ パケットの. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. The show redundancy and show issu state commands verify that redundancy mode is enabled and that SSO and NSF are configured. Redundancy may not work due to differences between the Cisco IOS releases. Step 5. Connected to network with 4x10G links. 1. The default standby power supply slot is PS8. I try to setup HA with SSO with 2x WLC 5520 version 8. Router(config-red)# end. 2. If a switch is configured for SSO mode, then stand-by supervisor engine stops at " FIB table synchronization". When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Communications = Up. To re-enable SSO, execute the command Config redundancy sso on the primary and secondary controllers. The software upgrade procedure supported by supervisor engine redundancy allows you to reload the Cisco IOS software image on the redundant supervisor engine, and once complete, reload the active supervisor engine. config redundancy mode sso. Information About Redundancy. 4) Once WLC is back verify the Boot image version is matching with the Primary. Redundant System Information : Available system uptime = 53 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = noneCisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Cupertino 17. This feature is supported on all controller models supporting HA SSO feature: Cisco 8500 Series Controllers . n+1 redundant Mode—n number of power supply modules are active (n can be one to seven pput ower supply modules). Step 4: mode sso. With RPR, the backup supervisor engine is partially initialized and must reload. 255 ! interface GigabitEthernet1/0/4 ip vrf forwarding vpn1 ip address 10. With NSF/SSO, peer networking devices do not experience routing flaps. Step 2. Supervisor Module Redundancy. In SSO mode . 5. What is redundancy mode Cisco? 4. The system has experienced 4 switchovers. In specific Cisco networking devices that support dual RPs, SSO takes advantage of RP redundancy to increase network availability. Example: Device(config-red)# mode sso: Configures stateful switchover. SSO on the other hand is fully initialized. SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. Example: Device(config-red)# mode sso: Enables the redundancy mode of operation to SSO. It designates one of the RPs as the active RP and the other as the standby. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine. In this CCNP ENCOR lesson, we will focus on this redundancy mechanism. The SSO HSRP feature enables the Cisco IOS HSRP subsystem software to detect that a standby RP is installed and the system is configured in SSO redundancy mode. Redundancy may not work due to differences between the Cisco IOS releases. Go to solution. Example: Device(config-red)# mode sso: Configures stateful switchover. Step 4 Router# show redundancy states Displays the operating redundancy. Router(config)# redundancy. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Step 5 . Router#show redundancy Redundant System Information : ----- Available system uptime = 6 days, 4 hours, 17 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. Example: Device(config-red)# mode sso: Configures stateful switchover. Step 4: mode sso. their Capwap tunnel, APs and clients get disconnected. 2(20)EWA and later releases. ※ このドキュメントでは AireOS 8. Usage Guidelines. The following are the ways in which Cisco StackWise Virtual's redundancy model differs from that of the standalone mode: The Cisco StackWise Virtual active and standby switches are hosted in separate switches and use a StackWise Virtual link to exchange information. If the router is configured for SSO mode, and the active RP fails before the standby is ready to switch over, the router will recover through a full system reset. This mode utilizes two electrical grids, each one powering a half module within each power supply. insrc-redundant. In the RPR mode, one of the supervisor engines is active and operational, while the second supervisor engine is in the standby mode. Connect with console to it and check which state it is in. CiscoStackWiseVirtualRedundancy 15 SSORedundancy 15 NonstopForwarding 16 MultichassisEtherChannels 16 MECMinimumLatencyLoadBalancing 16 MECFailureScenarios 17. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the supervisor modules to support SSO mode. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. debug redundancy {infra | facilitator. For WLC 2, go to Console connection: Note Once SSO is enabled, the Standby WLC can be accessed via console connection or via SSH on the service port and on the redundant management interface. Example: Router(config)# end. 130，称为WLC1; 第二个地址为IP地址10. You can also manually initiate a switchover by entering the redundancy force switch-over command on the Cisco StackWise Virtual active supervisor in privileged EXEC mode. Enter configuration commands, one per line. 170 West Tasman Drive. 133，稱為WLC2。. † Software upgrade. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. To enter the redundancy main configuration submode and enable the standby switch, use the main-cpu command in redundancy configuration mode. Step 5. If it is in ROMMON, try boot with manual "boot" command. Router# configure terminal Router(config)# redundancy Router(config)# mode SSO Router(config)# exit. We have two Cisco WLC 8540 in HA pair. Enters redundancy configuration mode. One switch is running 3. 0 10. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. 90. The mode sso command can be entered only from within redundancy configuration mode. Configured Redundancy Mode = RPR. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine. In case of n+1 redundancy, access points are configured with primary, secondary, and tertiary controllers. Further, if the active RP fails, no change occurs to the HSRP group itself and traffic continues to be forwarded through the current active gateway device. (Cisco Controller) >show redundancy summary Redundancy Mode = SSO ENABLED Local State = ACTIVE Peer State = UNKNOWN - Communication Down. n+1 redundant Mode—n number of power supply modules are active (n can be one to seven power supply modules). Route Processor Redundancy (RPR) refers to the provision of support for the redundancy feature. Here are the steps: Step 1 Clear the offending configuration (that caused an MCL) while the standby supervisor engine is in standby cold (RPR) state. Enters global configuration mode. 2. Step 5: exit. Cisco NSF with SSO allows for the forwarding of data packets to continue along known routes while the routing protocol information is being restored following a switchover. after reboot ASR can used single processer but, when I show redundancy configure still mode sso I used in config t and redundancy and default-exit and enter and save non reboot after then show config again config in redundacy mode none Bias-Free Language. mode SSO 5. = 0 Last switchover reason = active unit removed Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine. 90. Router# show redundancy Operating mode is sso redundancy mode sso hw-module slot 6 image disk0:rsp-pv-mz hw-module slot 7 image disk0:rsp-pv-mz Active in slot 6 Standby in slot 7 The system total uptime since last reboot is 2 weeks, 23 hours 41 minutes. If a switch is configured for SSO mode, then stand-by supervisor engine stops at " FIB table synchronization" and waits for active supervisor to fail. Maintenance Mode = Disabled. >> configure the IP of the redundancy management interface with: config interface address redundancy-management <new IP > <new IP for the peer redundancy management interface> This needs to be done on both of them using the console connection and then enable the SSO again as: >> config redundancy mode sso. Once you get them on the same version, you will be able to get to SSO. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. The SSO HSRP feature enables the Cisco IOS HSRP subsystem software to detect that a standby RP is installed and the system is configured in SSO redundancy mode. Standby failures = 3. For more information, see Chapter 1, “Route Processor Redundancy (RPR). cisco Systems, Inc. Command Modes. Example: Router(red-config)# exit: Exits to global configuration mode. 2(20)EWA and later releases. Example: Router(config-red-app-grp)#name cube-ha. Step 4: mode SSO Example: Router(config)# mode SSO Configures SSO. SSO provides RP redundancy by establishing one of the RPs as the active processor and the other RP as. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine. Router(config-red)# end. When we simulate a problem by powering off the Active Controller, the standby controller will reboot, all of our APs loose. Step 1. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. = Non-redundant Redundancy Mode (Configured) = sso Redundancy State = Non. Sw-4510R (config-red)#>redundancy Sw-4510R (config-red)#mode sso Changing to sso mode will. show redundancy Redundant System Information :-----Available system uptime = 11 hours, 31 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none. This example shows how to set the redundancy mode to SSO: Device(config)# redundancy Device(config-red)# mode sso Device(config-red)# policy config-sync prc reload. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Step 4 Router# show redundancy states Displays the operating redundancy mode. 133 voor de tweede, WLC2 genoemd. The device supports fault resistance by allowing a standby switch to take over if the active device becomes unavailable. This chapter describes how to configure supervisor engine redundancy using Cisco nonstop forwarding (NSF) with stateful switchover (SSO). Configured Redundancy Mode = sso. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Example: Device#. Note Enabling SSO initiates a controller reboot. Book Contents Book Contents. (Cisco Controller) >show redundancy summary. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Switch(config-red)# end. Connect redundancy ports together on primary/secondary. Router (config-red)# mode sso. redundancy 4. Usage Guidelines. San Jose, California 95134-1706. The software upgrade procedure supported by supervisor engine redundancy allows you to reload the Cisco IOS software image on the redundant supervisor engine, and once complete, reload the active supervisor engine once. Operating Redundancy Mode = sso. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. Are these switches setup in this manner by default? Can the redundancy be disabled if I am not going to use redundancy? What are the commands to disable redundancy? switch 1 provision ws-c3850-48p. The default mode for the Cisco uBR10012 universal broadband router is SSO. 10. Router (config-red)# end. LACP and PAGP is not supported in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16. This feature is supported on all controller models supporting HA SSO feature: Cisco 8500 Series Controllers . HA_CONFIG_SYNC-6-BULK_CFGSYNC_SUCCEED: Bulk Sync succeeded Switchover Process Restrictions. It is setup in the below settings but I am not running a pair of these switches. RTR02-Sec#sh redundancy. config redundancy mode sso. 0. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating. Example: Device(config-red)# mode sso: Configures stateful switchover. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the switches in the stack to support SSO mode. This feature is not supported on the C9500-12Q, C9500-16X, C9500-24Q, C9500-40X models of the Cisco Catalyst 9500 Series Switches. 168. SRM is inherent with SSO, which brings up the standby route processor. My routers only show redundancy mode as none. +1 is the power supply module reserved for redundancy. You can configure an n+1 redundant mode. If any of those mismatched commands are executed on the active switch, the standby. Step 2: mode sso. The available power is the total power capacity of all power supplies. A redundancy VLAN is connected to the redundant port on Cisco WiSM2 through the backplane. Upgrade the current active Supervisor. Step 5. Enters redundancy configuration mode. Introduction; Whats New in Cisco IOS XE Dublin 17. The SSO feature takes advantage of RP redundancy by establishing one of the RPs as the active RP while the other RP is designated as the standby RP, and then synchronizing critical state. The configuration on the active controller is synched to the standby controller via the redundant port. Redundancy Mode (Configured) = sso . Usage Guidelines. Step 6. Device# show redundancy Redundant System Information : ----- Available system uptime = 6 days, 5 hours, 28 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. † Software. Router(config)# redundancy. 3 and 7. The redundancy explained in this article is 1:1, which means that one of the units operates in Active state while the other operates in Hot Standby state. Step 4. Redundancy may not work due to differences between the Cisco IOS releases. +1 is the power supply module reserved for redundancy. 03. The New High Availability feature i. SSO HSRP. Maintenance Mode = Disabled . Step 5. After rebooting the primary controller changed into Maintanence Mode. SSO is supported in Cisco IOS Release 12. With RPR+, the redundant supervisor engine is fully initialized and configured, which shortens the. Permanent Virtual Circuits For ATM to support forwarding during and after switchover, ATM permanent virtual circuits (PVCs) must remain up not only within the networking device, but also within the ATM network. I will show you how to make a wireless-controller-cluster. On primary controller, disable SSO using the command: Config redundancy mode disable The Active and Standby WLCs. Enters redundancy configuration mode. Example: Device(config-red)# mode sso: Configures stateful switchover. Verifies that SSO is enabled. Exits configuration mode and returns to the. Both controllers reboot and pair up in the SSO mode. Enters redundancy configuration mode. The mode sso command can be entered only from within redundancy configuration mode. You usually will find the two redundancy terms together, as "SRM with SSO. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the switches in the stack to support SSO mode. 3. Note Enabling SSO initiates a controller reboot. Step 6. Step 8: exit. Example: Device (config-red)# endWith SSO redundancy, the StackWise Virtual standby switch is always ready to assume control if a fault occurs on the StackWise Virtual active switch. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. 39. A router in SSO redundancy mode checkpoints Layer 2 protocol states and line card operation. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating mode. SSO checkpointing is the process of mirroring information between RPs. 4 allows the access point (AP) to establish a CAPWAP tunnel with the Active WLC and share a mirror copy of the AP database with the Standby WLC. mode sso. The SSO HSRP feature enables the Cisco IOS HSRP subsystem software to detect that a standby RP is installed and the system is configured in SSO redundancy mode. Wrong handling can happen and. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine starts up in a fully-initialized state and synchronizes with the persistent configuration and the running configuration of the active supervisor engine. Cisco Employee. Initiate a switchover using the command redundancy force-switchover. The SSO HSRP feature enables the Cisco IOS HSRP subsystem software to detect that a standby RP is installed and the system is configured in SSO redundancy mode. On the Cisco 8500 Series Catalyst Edge Platform, Stateful Switchover (SSO) can be used to enable a second IOS process. Enter config redundancy mode SSO command to enable SSO. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Note After configuring SSO mode, the standby RP will automatically reset. 10. If the HA unit is not an HA sku, then you need a minimum of 50 ap license. Step 2: mode sso.