Last switchover reason = user_forced. 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. Step 5. 56. end. 2(20)EWA and later releases. Cisco NSF helps to suppress routing flaps in SSO-enabled devices, thus reducing network instability. Step 7: end. Information About Redundancy. HSRP is SSO aware on interfaces that are configured for HSRP and the standby RP is automatically reset. This example shows how to set the redundancy mode to SSO: Device (config)# redundancy Device (config-red)# mode sso Device (config. This step is complete when the chassis configuration is synchronized, as indicated by the Bulk sync succeeded message. 10. Redundancy Mode (Configured) = sso . Usage Guidelines. 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. 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. Example: Device(config-red)# mode sso: Configures stateful switchover. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. 102. Step 2: mode sso. This mode does not provide power redundancy. † Software. SSO is supported in Cisco IOS Release 12. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. 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. ホット スタンバイ WLC の設定. mode sso. Router# copy running-config startup-config 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. In our example we are using the following IP addresses: WLC Active. (See the “Performing a Software Upgrade” section on page 8-12. Note Enabling SSO initiates a controller reboot. 5 and the other is running 3. 4. C6807-XL#show redundancy Redundant System Information :----- Available system uptime = 21 hours, 41 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none Hardware Mode = Simplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled. The default mode for the Cisco 7500 series routers is HSA. Check if Auto-Boot is Enabled 6. Router# configure terminal. 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. Check if Switches are in SSO Mode 5. The processing of mirroring this information between route processors is known as checkpointing. This chapter describes how to configure supervisor engine redundancy using Cisco nonstop forwarding (NSF) with stateful switchover (SSO). End with CNTL/Z. 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. To do this, we will use “redundancy” command under global configuration mode and after that we will select mode with “mode sso” command. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. Step 2: mode sso Example: Switch (config-red)# mode sso Configures SSO. 3. What is redundancy mode Cisco? 4. 1. Operating Redundancy Mode = sso Maintenance Mode = Disabled Communications = Up Current Processor Information :----- Active Location = slot 2. +1 is the power supply module reserved for redundancy. High Availability SSO Deployment Guide for Cisco Catalyst 9800 Series Wireless Controllers, Cisco IOS XE Amsterdam 17. Example: Router(config-red)# mode sso. This command supports Route Processor Redundancy Plus (RPR+) with the Cisco uBR10012 router. After this the WLC will reboot and come back as Primary and Standby WLC again. Example: Device(config-red)# exit: Exits redundancy. Step 6. mode sso. Standby として動作していた WLC のポートを変更するか、コンフィグの初期化する. Step 5. Step 4. mode sso. Exits configuration mode and returns to the. When two versions of Cisco IOS images are involved, the command sets supported by two images might differ. Usage Guidelines. end. A router in SSO redundancy mode checkpoints Layer 2 protocol states and line card operation. %HA-5-MODE:Operating mode is sso, configured mode is sso. Copy the New Image to be Upgraded / Downgraded ISSU Workflows - Actual Upgrade One Step Work Flow Three Step Work Flow Post ISSU Checklist Action. 1 onwards, the method to configure the gateway IP. Switch# show running-config. Hi! A custommer of mine tried to configure HA AP-SSO with two 5508 controllers. redundancy. The DHCP high availability features are enabled by default when the redundancy mode of operation is set to SSO. exit 6. Since we couldnt afford downtime I rebooted standby controller that was in maintenance mode and it was able to boot in sso redundant mode. config redundancy mode sso. 0 を. configure interface address management 10. You usually will find the two redundancy terms together, as "SRM with SSO. 2. their Capwap tunnel, APs and clients get disconnected. HA_CONFIG_SYNC-6-BULK_CFGSYNC_SUCCEED: Bulk Sync succeeded Switchover Process Restrictions. Enter configuration commands, one per line. We have two Cisco WLC 8540 in HA pair. Stateful Switchover is particularly useful in conjunction with Nonstop. You can configure an n+1 redundant mode. End with CNTL/Z. Check if Auto-Boot is Enabled 6. configure redundancy mode ssoEnters redundancy configuration mode. Step 5. When this command is entered, the standby supervisor module is reloaded and begins to work in SSO mode. ※ このドキュメントでは AireOS 8. Redundancy may not work due to differences between the Cisco IOS releases. 5) Bring up only one Gig interface and try to access it. Catalyst 4500 series switches allow a standby supervisor engine to take over if the active supervisor engine fails. Note Enabling SSO initiates a controller reboot. Hardware redundancy on the Cisco ASR 1000 Series Routers gives users the following benefits: A failover option—If a processor fails, the standby processor immediately becomes the active processor with little or no delay. 0. Router# copy running-config. Hope that helps! -Bradley Selzer. 2(20)EWA and later releases. 255 ! interface GigabitEthernet1/0/4 ip vrf forwarding vpn1 ip address 10. In case of n+1 redundancy, access points are configured with primary, secondary, and tertiary controllers. The show redundancy and show issu state commands verify that redundancy mode is enabled and that SSO and NSF are configured. Configured Redundancy Mode = sso. Step 7: mode sso. Enter application redundancy mode. Router# configure terminal Router(config)# redundancy Router(config)# mode SSO Router(config)# exit Router# reload Stateful Switchover. This feature is supported on all WLC models supporting HA SSO feature: Cisco 8500 Series WLCs . %HA-5-MODE:Operating mode is sso, configured mode is sso. After changing the license boot level in sso, you only need to restart the standby engine. end. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant 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. Switch(config-red)# end. LACP and PAGP is not supported in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16. 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. Step 5:. 2. What is redundancy mode SSO? 2. On the standby controller, re-enter the correct IP addresses corresponding to the management and dynamic interfaces. 2. The following example displays verification that the system is in SSO mode and that slot A—RP A is the active R, and slot B—RP B is the standby RP. Cisco Employee. x. 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. 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. In dit voorbeeld is de stateful switchover (SSO) met hoge beschikbaarheid (HA) geconfigureerd tussen twee 9800-CL-instanties, die dezelfde Cisco IOS-softwareversie uitvoeren, die geconfigureerd zijn met gescheiden WMI's en met GUI die toegankelijk is op. (RTU Evaluation License by now) - Network Connection beween the WLC5520: LAG. mode sso. • With a Supervisor Engine 720, if all the installed switching modules have DFCs, enter the fabric switching-mode allow dcef-only command to disable the Ethernet ports. Service-Port: 192. (Operational) = sso Redundancy Mode. San Jose, California 95134-1706. SSO refers to the implementation of Cisco IOS software that allows applications and features to maintain a defined state between an active and standby Route Processor (RP). Configures SSO. Enters redundancy configuration mode. Example: Device(config-red)# mode sso: Configures stateful switchover. Check the Current ISSU and Install States 7. 10. Step 2: mode sso Example: Switch (config-red)# mode sso Configures SSO. Step 5. HTH,. Step 3. The switch is. Check the Current ISSU and Install States 7. The Cisco Nexus 9504, 9508,. 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. 48. Configuraties. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to privileged EXEC mode. main-cpu. 101. How To Configure Route Processor Redundancy. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. 150. Cisco ASR1006 supports the stateful failover from an active Enhanced Services Processor (ESP) to a standby and from an active Route Processor to a standby on the same box. end. SSO HSRP. 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. EMD EARLY DEPLO. Example: Device(config-red)# mode sso: Configures stateful switchover. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. config redundancy mode sso. Router# copy running. The available power is the total power capacity of all power supplies. Note After configuring SSO mode, the standby RP will automatically reset. The mode sso command can be entered only from within redundancy configuration mode. (Operational) = sso Redundancy Mode. Note Enabling SSO initiates a controller reboot. If a switch is configured for SSO mode, then stand-by supervisor engine stops at " FIB table synchronization". In this step, the VSS standby chassis reboots, reloads with the new image, and initializes as the VSS standby chassis in SSO redundancy mode, running the new image. Cisco IOS Nonstop Forwarding (NSF) always runs with stateful switchover (SSO) and provides redundancy for Layer 3 traffic. 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. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Step 4. (Optional) Ensure network. Step 6: mode sso. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the to support SSO mode. Redundancy may not work due to differences between the Cisco IOS releases. 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. 0. This made the standby WLC to go into maintenance mode. 0. Step 5. SSO pair connected to upstream VSS pair with RP connected via the upstream set of switches in order to detect gateway down scenario. Configure redundancy with RMI + RP pairing. 9800 WLC-1# show redundancy Redundant System Information : ----- Available system uptime = 1 hour, 35 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 = Disabled Communications = Up Current. Note After configuring SSO mode, the standby RP will automatically reset. The feature is enabled by default when the redundancy mode of operation is set to SSO. Step 4. To reload the standby switch if a parser return code (PRC) failure occurs during configuration synchronization, use the policy config-sync reload command in redundancy configuration. auto-sync standard. Once the WLCs are back up then go ahead and reconfigure the HA AP-SSO on the Controller by issuing the following command: Controller>config redundancy mode sso. SSO Operation. 6. Router# show redundancy Redundant System Information :-----Available system uptime = 1 hour, 0 minutes Switchovers system experienced = 0 Standby failures = 1 Last switchover reason = none Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled. Example: Device(config-red)# mode sso: Configures stateful switchover. The mode sso command can be entered only from within redundancy configuration mode. Step 3:. (Optional) Backup the Startup Config and Running Config files of the controllers. Step 5: exit. Redundant System Information :----- Available system uptime = 44 weeks, 2 days, 6 hours, 12 minutes. SSO is supported in Cisco IOS Release 12. ATM SSO is not configurable and runs by default on networking devices configured with ATM and Redundancy Mode 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. To reload the standby switch if a parser return code (PRC) failure occurs during configuration synchronization, use the policy config-sync reload command in redundancy configuration. RF debug mask = 0x0. 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. x. The Cisco RF Gateway 10 Supervisor Engine 7-E uplink ports are not recommended for data or management traffic in Supervisor Redundancy Mode. Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled Communications = Up Current Processor Information :----- Active Location = slot 1 Current Software state = ACTIVE Uptime in current state = 30 minutes Image Version = Cisco IOS Software [Fuji], Catalyst L3 Switch Software. 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. 2(20)EWA and later releases. I have 2x 5508 in SSO mode. Cisco HA architecture is based on redundant Route Processors and the NSF and SSO features, such that ports stay active and calls do not drop, eliminating network disruption during upgrades. Sets the redundancy configuration mode to SSO on both the active and standby RP. Enters redundancy configuration mode. = Non-redundant Redundancy Mode (Configured) = sso Redundancy State = Non Redundant. Cisco StackWise Virtual Redundancy. mode sso. Step 3. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. The mode sso command can be entered only from within redundancy configuration mode. 0. 1 Disabling SSO on HA Pair 1 On primary controller, disable SSO using the command: config. SSO checkpointing is the process of mirroring information between RPs. 2. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. %HA-5-MODE:Operating mode is sso, configured mode is sso. 在本示例中，高可用性 (HA)状态切换 (SSO)配置在运行相同Cisco IOS软件版本的两个9800-CL实例之间，这些实例已配置有独立的WMI，且可在以下位置访问 GUI: 第一个地址为IP地址10. 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. 12 255. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. 39. Step 3. When we simulate a problem by powering off the Active Controller, the standby controller will reboot, all of our APs loose. Redundancy Mode (Operational) = sso Redundancy Mode (Configured) = sso Redundancy State = sso Maintenance Mode = Disabled Manual Swact = enabled Communications = Up. Table 13-5 Redundancy Modes, Platform Support, and. 56. Check the Boot Mode 3. 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 5. 0. Configured Redundancy Mode = RPR. cisco Systems, Inc. This feature is not supported on the C9500-12Q, C9500-16X, C9500-24Q, C9500-40X models of the Cisco Catalyst 9500 Series Switches. There is no way i can change it to redundancy mode SSO. When an RP is active and the other RP is standby, SSO enables the standby RP to take over if the active RP fails. Verifies that SSO is enabled. Router(config)# redundancy. Dans cet exemple, la commutation avec état (SSO) haute disponibilité (HA) est configurée entre deux instances 9800-CL, qui exécutent la même version du logiciel Cisco IOS, qui ont été configurées avec des WMI séparés et avec une interface utilisateur graphique accessible à l'adresse. end. (Cisco Controller) >show redundancy summary Redundancy Mode = SSO ENABLED Local State = ACTIVE Peer State = UNKNOWN - Communication Down. Active WLC 上で SSO の mode を disable にする. Example: Router(red-config)# exit: Exits to global configuration mode. ※ このドキュメントでは AireOS 8. 1. Switches can run multiple route processors (supervisors) in 3 modes: RPR (Route Processor Redundancy) RPR+ (Route Processor Redundancy plus) SSO (Stateful Switchover) While RPR was the 1 st one to be introduced, RPR+ came in later and the latest offering was SSO. auto-sync startup-config. ) To minimize down time during software changes on the supervisor engine, load the new image onEnters redundancy configuration mode. • With a Supervisor Engine 720, if all the installed switching modules have DFCs, enter the fabric switching-mode allow dcef-only command to disable the Ethernet ports on both supervisor engines, which ensures that all modules. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Communications = Up. SSO HSRP. Sw-4510R (config-red)#>redundancy Sw-4510R (config-red)#mode sso Changing to sso mode will. Before you begin the ISSU process, verify the redundancy mode for the system. Cisco 5520 wireless LAN controller has a failover RP Port. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine. redundancy 4. For Enterprise Services or IP Base mode, use ISSU to upgrade software for both RPR and SSO redundant mode. Step 3: end . Example: Device(config-red)# mode sso: Configures stateful switchover. This feature is supported on all controller models supporting HA SSO feature: Cisco 8500 Series Controllers . SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. show redundancy states. 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. The system has experienced 4 switchovers. Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled Communications = Up. 05 Model Number : C9606R Model Number : C9606R: CAT9600#sh redundancy Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Active Location = Switch 2 Current Software state = ACTIVE Standby Location = Switch 1 Current Software state = STANDBY HOT: CAT9600#show license summary With Stateful Switchover (SSO), Cisco IOS routers with dual RPs can synchronize router configuration and control plane state information. First you can completely configure the first WLC as you wish. Step 5. 0. The mode sso command can be entered only from within redundancy configuration mode. Hardware Mode = Duplex. show redundancy Redundant System Information :-----Available system uptime = 11 hours, 31 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none. . Enabling SSO reboots the controllers to negotiate the HA role as per the configuration performed. Step 4: mode sso. The default mode for the Cisco 7304 router and Cisco 10000 series routers is SSO. Configurations. Configuration Examples for DHCP High. SRM is inherent with SSO, which brings up the standby route processor. Configured Redundancy Mode = SSO. n+1 redundant Mode—n number of power supply modules are active (n can be one to seven pput ower supply modules). Router> enable. Switchovers system experienced = 5. 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. Step 4 Router# show redundancy states Displays the operating redundancy. SSO pair connected to upstream VSS pair with split links and RP connected back to back. 0 を. 2. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the to support SSO mode. exit Router(config)# exit. 12. End with CNTL/Z. Step 4. In this CCNP ENCOR lesson, we will focus on this redundancy mechanism. 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. 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. Step 2 Router(config-red)# mode sso Configures SSO. @Ivan Shirshin wrote: Hi, It is likely standby sup is stuck in boot or ROMMON mode as it is showing Other status in the outputs above. Maintenance Mode = Disabled. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Example: Device(config-red)# mode sso: Configures stateful switchover. Switch# show running-config. Router(config)# mode sso. Step 6. (Cisco Controller) >show redundancy summary. NSF Operation. HA_CONFIG_SYNC-6-BULK_CFGSYNC_SUCCEED: Bulk Sync succeeded Switchover Process Restrictions. 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 =. Follow these guidelines when configuring your system to SSO mode: You must use identical Cisco IOS images on the to support SSO mode. 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. Configuration, forwarding, and state information are synchronized from the StackWise Virtual active switch to the redundant switch at startup, and whenever changes to the StackWise Virtual. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. With NSF/SSO, peer networking devices do not experience routing flaps. Once you get them on the same version, you will be able to get to SSO. 05-25-2012 08:56 AM - edited 03-07-2019 06:54 AM. Connect the network ports. 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. 2(20)EWA and later releases. On primary controller, disable SSO using the command: Config redundancy mode disable The Active and Standby WLCs. Check if Switches are in SSO Mode 5. Router# copy running. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. Cisco Public HA SSO behavior Redundancy Port (RP) BRKEWN-2846 19 Redundancy Port (RP) • Syncs configuration and AP/Client databases between Active and Standby • Monitors status of the chassis • Possible single point of. In Cisco Wireless LAN Controllers, redundancy is achieved in two ways— n+1 and AP SSO redundancy. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. 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. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Enters redundancy configuration mode. HSRP is SSO aware on interfaces that are configured for HSRP and the standby RP is automatically reset. 10. The routing protocols have been enhanced with NSF-capability and. #sh redundancy Redundant System Information :-----Available system uptime = 1 year, 7 weeks, 1 day, 2 hours, 8 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none. 48. I tried to switch on SSO mode on both wlc 5520. 2016-10-12 10:10 AM 2017-09-01 03:01 AM 更新. 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 5. SSO is supported in Cisco IOS Release 12. Enters redundancy configuration mode. SSO pair connected to upstream HSRP active and standby and RP connected via upstream set Now, let’s focus on Cisco SSO Configuration and learn how to configure SSO on Cisco routers. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Note Enabling SSO initiates a controller reboot.