Step 5: end. Switch(config-red)# end. Image Version = Cisco IOS Software, IOS-XE Software, Catalyst 3 850 L3 Switch Software (CAT3850-UNIVERSALK9-M), Version 03. 10. Step 3: end. The show redundancy and show issu state commands verify that redundancy mode is enabled and that SSO and NSF are configured. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. Communications = Up. (Optional) Backup the Startup Config and Running Config files of the controllers. mode sso. 150. Maintenance Mode = Disabled. 0. 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. Usage Guidelines. San Jose, California 95134-1706. These sections describe supervisor engine redundancy using NSF with SSO: About Cisco IOS NSF-Aware and NSF-Capable Support; NSF with SSO Supervisor Engine Redundancy Overview. The SSO/ISSU feature supports only the Cisco ASR 1000 Series Aggregation Services Routers intrachassis (RP-to-RP) SSO, but not the interchassis (Cisco ASR1K-to-Cisco ASR1K) 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. The mode sso command can be entered only from within redundancy configuration mode. Cisco 3504 Controllers. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. and the redundant supervisor engine boots into a partially-initialized state in RPR mode and a fully-initialized state in SSO mode. Maintenance Mode = Disabled. Example: Device(config-red)# mode sso: Configures stateful switchover. On the Cisco 8500 Series Catalyst Edge Platform, Stateful Switchover (SSO) can be used to enable a second IOS process. Step 4. Router(config-red)# end. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. 0. 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, SSO2 つの Cisco Wireless Services Module 2（WiSM2）プラットフォーム間の HA を実現するには、コントローラを単一のシャーシに配置するか、仮想スイッチング システム（VSS）を使用してリダンダンシー VLAN を複数のシャーシ間に拡張することで、複数のシャーシに配置する必要があります。3. The sku on the box for the HA should have this part number: air-ct5508-ha-k9. Solved: Hi, I need help to get a HA SSO setup running. 168. config redundancy mode sso. The default mode for the Cisco uBR10012 universal broadband router is SSO. mode sso. 2(20)EWA and later releases. (NSF) with a stateful switchover (SSO) when a supervisor-level failure occurs. x. 6. Enters redundancy configuration mode. Sets the redundancy configuration mode to SSO on both the active and standby RP. The default standby power supply slot is PS8. Router(config-red)# end. Communications = Up . This example shows how to set the redundancy mode to SSO: Device (config)# redundancy Device (config-red)# mode sso Device (config. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to. 5. Step 5. (Optional) Ensure network connectivity. Maintenance Mode = Disabled . 3. This feature is supported on all controller models supporting HA SSO feature: Cisco 8500 Series Controllers . 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. 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. Example: Device(config-red)# exit: Exits redundancy. Step 2. Example: Device(config-red)# mode sso: Configures stateful switchover. Enters redundancy configuration mode. Step 6 . 0 10. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. On the standby. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. For WLC 1, go to Monitor > Redundancy > Summary: b. Step 2. Example: Device(config-red)# mode sso: Configures stateful switchover. = 0 Last switchover reason = active unit removed Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode =. exit Router(config)# exit. 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. 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. Enter config redundancy mode SSO command to enable SSO. Step 5: redundancy. WLC のステータスや設定を確認する. Router(config)# mode sso. 2016-10-12 10:10 AM 2017-09-01 03:01 AM 更新. 56. 48. Configuring Cisco NSF with SSO • FindingFeatureInformation,page1 • PrerequisitesforNSFwithSSO,page1 • RestrictionsforNSFwithSSO,page2. Enter configuration commands, one per line. Complete these steps in order to check the redundancy status: a. 1. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Check the Current ISSU and Install States 7. This chapter describes how to configure supervisor engine redundancy using Cisco nonstop forwarding (NSF) with stateful switchover (SSO). We have two Cisco WLC 8540 in HA pair. Displays the operating. Step 7: mode sso. The. To do this, we will use “redundancy” command under global configuration mode and after that we will select mode with “mode sso” command. Enter application redundancy 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. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. SSO Dual-Route Processors and Cisco Nonstop Forwarding. 1. SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. With RPR, the backup supervisor engine is partially initialized and must reload. Convert RPR to SSO mode, this will force a reboot on standby supervisor. Enters redundancy configuration mode. Step 5 . 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. 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 = Disabled Communications = Up Current. This mode utilizes two electrical grids, each one powering a half module within each power supply. When the controller works as a host for spanning tree, ensure that you configure portfast trunk in the uplink switch using. Example: Device (config-red)# end Controller # 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 = Disabled Communications. Catalyst 4500 series switches allow a standby supervisor engine to take over if the active supervisor engine fails. 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. SSO pair connected to upstream VSS pair with split links and RP connected back to back. Step 4. >> 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. In the RPR mode, one of the supervisor engines is active and operational, while the second supervisor engine is in the standby mode. Redundancy may not work due to differences between the Cisco IOS releases. Example: Device(config-red)# mode sso: Configures stateful switchover. 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. With NSF/SSO, peer networking devices do not experience routing flaps. Usage Guidelines. This feature is not supported on the C9500-12Q, C9500-16X, C9500-24Q, C9500-40X models of the Cisco Catalyst 9500 Series Switches. Cisco Stateful Switchover (SSO) is one of the redundancy mechanisms used in networking. For more information, see Chapter 1, “Route Processor Redundancy (RPR). 0(22)S. 1. 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. Enabling SSO reboots the controllers to negotiate the HA role as per the configuration performed. Step 4. EMD EARLY DEPLO. To reload a single supervisor in the Quad-Supervisor setup enter the hw-module switch switch-number subslot subslot-number oir power-cycle command in privileged. Note SSO is not supported if the IOS-XE software is running in the LAN Base mode. 39. Redundancy may not work due to differences between the Cisco IOS. 4. Use the power redundancy-mode {combined. (Cisco Controller) >show redundancy summary. 6) once you accessible check the Redundancy summary. Hope that helps! -Bradley Selzer. Step 5. Example: Device(config-red)# end: Exits redundancy configuration mode and. Maintenance Mode = Disabled. 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. They will reboot again. Step 4: show running-config Example:Enters redundancy configuration mode. Usage Guidelines. Configures SSO. Displays the operating redundancy mode. SSO functions in networking devices (usually edge devices) that support dual RPs. Operating Redundancy Mode = RPR. 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. Example: Device(config-red)# mode sso: Enables the redundancy mode of operation to SSO. What is SSO switchover? 5. On the standby controller, re-enter the correct IP addresses corresponding to the management and dynamic interfaces. Cat-6509#show redundancy Redundant System Information : ----- Available system uptime = 10 hours, 12 minutes Switchovers system experienced = 1 Standby failures = 1 Last switchover reason = user initiated Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso!--- This verifies that software has set the. 除了這些IP地址外. Description. Example: Device (config-red)# mode sso: Configures SSO. Router(config-red)# end. Configured Redundancy. A router in SSO redundancy mode checkpoints Layer 2 protocol states and line card operation. SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. LACP and PAGP is not supported in HA mode in releases until, and including, Cisco IOS XE Gibraltar 16. For information about the in-chassis standby supervisors, enter the show redundancy rpr command in privileged EXEC mode on the Cisco StackWise Virtual active supervisor. Information About Redundancy. Redundancy Mode = SSO ENABLED. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. All unsaved configuration will be saved. There is no way i can change it to redundancy mode SSO. When two versions of Cisco IOS images are involved, the command sets supported by two images might differ. . Verifies that SSO is enabled. To do this, we will use “redundancy” command under global configuration mode and after that we will select mode with “mode sso” command. Step 4. 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 noneUse the power redundancy-mode {combined. Redundancy Mode (Operational) = sso Redundancy Mode (Configured) = sso Split Mode = Disabled Manual Swact = Enabled Communications = Up client count = 29 client_notification_TMR = 30000 milliseconds keep_alive TMR = 9000 milliseconds keep_alive count = 1 keep_alive threshold = 18 RF debug mask = 0x0 Configuring BGP. Router(config-red)# end. Redundancy may not work due to differences between the Cisco IOS releases. n+1 redundant Mode—n number of power supply modules are active (n can be one to seven power supply modules). end. If the command is not found in. 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. The mode sso command can be entered only from within redundancy configuration mode. It is not recomended to configure RA (Registration Authority) as it is not validated. 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. The mode sso command can be entered only from within redundancy configuration mode. If the. mode sso. auto-sync running-config. Book Contents Book Contents. x. The mode sso command can be entered only from within redundancy configuration mode. Note After configuring SSO mode, the standby RP will automatically reset. 254. 2(20)EWA and later releases. Enters redundancy configuration mode. Is there anything I can do to force it out of maintenance mode? show redundancy summary Redundancy Mode = SSO ENABLED Local State = MAINTENANCE Peer State = UNKNOWN - Communication Down Unit = Secondary Redundancy State = Non Redundant Maintenance Mode = Enabled Maintenance cause= Secondary unit has. Connect the network ports. 0SG and later releases. While implementing Nonstop Forwarding (NSF) technology in systems using SSO. Step 4. Step 5: Enabling SSO reboots the. Step 5. Configuration Examples for DHCP High. In Cisco Wireless LAN Controllers, high availability is achieved with redundancy. 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. 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. 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. The VSS runs stateful switchover (SSO) between the VSS active and standby supervisor engines (see Figure 5. 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. configure redundancy mode sso. 131. end. It is not necessary to configure the IP address for the redundancy VLAN because the IP address is automatically generated. The state of these features is preserved between both the active and standby. Communications = Up. Router# copy running-config. Check if Switches are in SSO Mode 5. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. 1. show redundancy Redundant System Information :-----Available system uptime = 11 hours, 31 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none. The first two octets are always 169. Redundancy may not work due to differences between the Cisco. 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. Supervisor engine redundancy allows OIR of the redundant supervisor engine for maintenance. Redundancy may not work due to differences between the Cisco IOS. 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. High availability SSO is setup and is working good. 151. x. Redundancy may not work due to differences between the Cisco IOS. 2(20)EWA and later releases. In case of n+1 redundancy, access points are configured with primary, secondary, and tertiary controllers. end. Cisco recommends that you are familiar with stacking, stackwise-virtual (SVL), and "bundle" Vs "install" boot mode related concepts on Catalyst 9K switches. Example: Device(config-red)# mode sso: Enables the redundancy mode of operation to SSO. RF debug mask = 0x0. Step 5. This command supports Route Processor Redundancy Plus (RPR+) with the Cisco uBR10012 router. General Restrictions Two RPs must be installed in the chassis, each running the same version of the Cisco IOS software. 2. 3. 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. Active WLC 上で SSO の mode を disable にする. † Software. Router(config)# redundancy. Step 6. Learn more about how Cisco is using Inclusive Language. 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. Step 2 Enter the redundancy config-sync ignore mismatched-commands EXEC command at the active standby supervisor engine. Verify the redundancy status using command : show redundancy summary 5. Maintenance Mode = Disabled. 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. Step 4: show running-config Example: 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. Connected to network with 4x10G links. 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. With NSF/SSO, peer networking devices do not experience routing flaps. 168. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine. 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. Sets the redundancy configuration mode to SSO on both the active and standby RP. Step 2: mode sso . Example: Device(config-red)# end: Exits redundancy configuration mode and. Check if Switches are in SSO Mode 5. To disable Cisco StackWise Virtual, use the no form of this command. Device(config-red)# mode sso: Configures stateful switchover. SSO provides RP redundancy by establishing one of the RPs as the active processor and the other RP as the standby processor. The switch is supports route processor redundancy (RPR). Step 8: exit. To set the redundancy mode to stateful switchover (SSO), use the mode sso command in redundancy configuration mode. end. Redundancy Mode (Operational) = Non-redundant Redundancy Mode (Configured) = sso Redundancy State = Non Redundant Maintenance Mode = Disabled Manual Swact = disabled (system is simplex (no peer unit)) Communications = Down Reason: Simplex mode client count = 103 client_notification_TMR = 30000 milliseconds RF debug mask = 0x0Go to solution. And it has to be Layer 2 between the 2 RPs, so either directy connected or through a VLAN. 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. Step 3. (Operational) = sso Redundancy Mode. You can use the switch switch-number role command to set the active and standby switch in 1:1 stack mode. If peer unit's management and/or redundancy management entries are present as mobility members please remove them before enabling redundancy. 3 allows the AP to establish CAPWAP tunnel with Active WLC and share mirror copy of AP database with Standby WLC. 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. 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 5: end. Router(config)# mode sso. Command Modes. Local State = MAINTENANCE. It designates one of the RPs as the active RP and the other as the standby. The system has experienced 4 switchovers. Configured Redundancy Mode = sso Operating Redundancy Mode = sso Maintenance Mode = Disabled Communications = Up Current Processor Information :----- Active Location = slot 1/2 Current Software state = ACTIVE Uptime in current state = 36 minutes Image Version = Cisco IOS Software, s2t54 Software (s2t54-ADVENTERPRISEK9-M),SSO is supported in Cisco IOS Release 12. Enter configuration commands, one per line. Redundancy may not work due to differences between the Cisco IOS. Note Enabling SSO initiates a controller reboot. config redundancy mode sso on primary. CiscoStackWiseVirtualRedundancy 15 SSORedundancy 15 NonstopForwarding 16 MultichassisEtherChannels 16 MECMinimumLatencyLoadBalancing 16 MECFailureScenarios 17. Cisco SSO Operation. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. 2 (11)BC3. Image Version = Cisco IOS Software, Catalyst L3 Switch Software (CAT9K_IOSXE), Experimental Version 16. Usage Guidelines. We have an SSO HA implementation with 2x 5520 (both AIR-CT5520-K9), software version 8. Cisco 3504 Controllers. hw-switch switch 1 logging onboard message level 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. 2(20)EWA and later releases. insrc-redundant. cisco Systems, Inc. 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. 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. When you configure the controller for HA SSO, the Cisco 600 Series OfficeExtend Access Points are not supported. Example: Device (config-red)# mode sso: Configures SSO. Enters redundancy configuration mode. redundancy Router(config)# redundancy. Check if There is Sufficient Available Memory on Flash 4. † Software upgrade. ASR は2種類のRP redundancy modeがあります。 RPR Route Processor Redundancy とSSO Stateful Switchover になります。 RPR を使用すると、スタンバイ RP を設定することができます。RPR を設定する場合、 スタンバイ RP はブートアップ時に Cisco IOS ソフトウェアをロードし、スタンバイ モードで自身を初期化します. Step 6. Step 2: mode sso. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Usage Guidelines. 2. And the output of the "show redundancy" is: Hardware Mode = Duplex. 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 =. When a failover occurs, the standby device seamlessly takes over, starts performing traffic forwarding services, and maintains a dynamic routing table. Step 2: mode sso. 59. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. On primary controller, disable SSO using the command: Config redundancy mode disable The Active and Standby WLCs. Router(config)# mode sso. I try to setup HA with SSO with 2x WLC 5520 version 8. If a VSS does not meet the requirements for SSO redundancy, it will be incapable of establishing a relationship with the peer switch. Step 5. running with image version 8. Sets the redundancy configuration mode to SSO on both the active and standby RP. The redundancy port and the redundancy VLAN in Cisco WiSM2 are assigned an automatically generated IP address in which the last two octets are obtained from the last two octets of the RMI. SSO is supported in Cisco IOS-XE Release 3. Switch# show. Inbox redundancy with Stateful Switchover (SSO) mechanism provides redundancy within the same device. Router# configure terminal. SSO HSRP. Example: Device (config-red)# mode sso: Configures SSO. SSO Operation. The new High Availability (HA) feature (that is, AP SSO) set within the Cisco Unified Wireless Network software release version 7. To. There are three modes in redundancy for the standby supervisor when native Cisco IOS Software is used: RPR-The show module command displays Cold. 3SE (Catalyst 3850 Switches) 8 OL-30686-01. 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. Redundant System Information :----- Available system uptime = 44 weeks, 2 days, 6 hours, 12 minutes. 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. 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 switches in the stack to support SSO mode. Step 4. Configures SSO. (See the “Performing a Software Upgrade” section on page 8-12. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Operating Redundancy Mode = RPR. If it is in ROMMON, try boot with manual "boot" command. IP-adres 10. End with CNTL/Z. Copy the New Image to be Upgraded / Downgraded ISSU Workflows - Actual Upgrade One Step Work Flow Three Step Work Flow Post ISSU Checklist Action. A redundancy VLAN is connected to the redundant port on Cisco WiSM2 through the backplane. Router # Answer: In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating mode. %HA-5-MODE:Operating mode is sso, configured mode is sso. Step 5. This feature is supported on all WLC models supporting HA SSO feature: Cisco 8500 Series WLCs . 5 and the other is running 3. .