Note • The two Gigabit Ethernet interfaces on the redundant supervisor engine are always active unless you enter the fabric switching-mode allow dcef-only command. 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. Verifies that SSO is enabled. Step 2 Enter the redundancy config-sync ignore mismatched-commands EXEC command at the active standby supervisor engine. (Optional) Ensure network connectivity. 130，称为WLC1; 第二个地址为IP地址10. Enters redundancy configuration mode. SSO is supported in Cisco IOS Release 12. 2(20)EWA and later releases. SSO is supported in Cisco IOS-XE Release 3. This command has no. Note After configuring SSO mode, the standby RP will automatically reset. 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. Example: Device(config-red)# mode sso: Configures stateful switchover. The switch is supports route processor redundancy (RPR). 2. mode SSO 5. 2(20)EWA and later releases. The mode sso command can be entered only from within redundancy configuration mode. What is RPR redundancy?. Operating Redundancy Mode = rpr. 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. CiscoStackWiseVirtualRedundancy 15 SSORedundancy 15 NonstopForwarding 16 MultichassisEtherChannels 16 MECMinimumLatencyLoadBalancing 16 MECFailureScenarios 17. (Optional) Ensure network. The VSS runs stateful switchover (SSO) between the VSS active and standby supervisor engines (see Figure 5. You usually will find the two redundancy terms together, as "SRM with SSO. The first two octets are always 169. If controller1 is configured with 9. What is redundancy mode SSO? 2. 2(20)EWA and later releases. Step 4. main. The sku on the box for the HA should have this part number: air-ct5508-ha-k9. 1. Configured Redundancy Mode = sso. 61 /24. If you perform an online insertion and removal (OIR) of the module, the switch resets during the stateful switchover and the. 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. Example: Device(config-red)# end: Exits redundancy configuration mode and. 3. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Redundancy Mode = SSO ENABLED. Router# configure terminal. 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. • 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. 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. Step 5. 5. 3 and 7. Usage Guidelines. Stateful Switchover enabled routers will always checkpoint line card. Cisco 3504 Controllers. With NSF/SSO, peer networking devices do not experience routing flaps. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. A router in SSO redundancy mode checkpoints Layer 2 protocol states and line card operation. Redundancy Mode (Configured) = sso Redundancy State = sso Maintenance Mode = Disabled Manual Swact = enabled Communications = Up client count = 115Operating Redundancy Mode = RPR. 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. mode sso. The mode sso command can be entered only from within redundancy configuration mode. 2(20)EWA and later releases. HSRP is SSO aware on interfaces that are configured for HSRP and the standby RP is automatically reset. 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. exit 6. Step 4: show running-config Example: Enters redundancy configuration mode. 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. The device supports fault resistance by allowing a standby switch to take over if the active device becomes unavailable. Configures SSO. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Redundancy may not work due to differences between the Cisco IOS releases. client count = 109 . Hardware Mode = Duplex Configured Redundancy Mode = sso Operating Redundancy Mode = sso. Cisco IOS Nonstop Forwarding (NSF) always runs with stateful switchover (SSO) and provides redundancy for Layer 3 traffic. Configures SSO. mode sso. Step 5: exit. redundancy mode sso ! ip cef distributed mpls ldp graceful-restart mpls label protocol ldp ip vrf vpn1 rd 100:1 route-target export 100:1 route-target import 100:1 no mpls aggregate-statistics ! interface Loopback0 ip address 10. SSO Operation SSO is supported in Cisco IOS Release 12. Wrong handling can happen and. 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. Step 3. Once you get them on the same version, you will be able to get to SSO. Switch(config)# redundancy Switch(config-red)# mode sso Switch(config-red)# end Switch# show redundancy Redundant System Information : -----Available system uptime = 2 days, 2 hours, 39 minutes Switchovers system experienced = 0. ホット スタンバイ WLC の設定. We have an SSO HA implementation with 2x 5520 (both AIR-CT5520-K9), software version 8. 3. With NSF/SSO, peer networking devices do not experience routing flaps. Check if There is Sufficient Available Memory on Flash 4. 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. Specify a standby slot, by entering the power redundancy-mode redundant n+1 standby-PSslot command. 2SXF OL-3999-08 8. end. With NSF/SSO, peer networking devices do not experience routing flaps. Step 4: mode sso. 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. Router(config-red)# end. Complete these steps in order to check the redundancy status: a. 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. Step 6. When this command is entered, the standby switch is reloaded and begins to work in SSO 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 = 23 hours, 52 minutes Image Version = Cisco IOS Software [Fuji], Catalyst L3 Switch Software. 05-25-2012 08:56 AM - edited 03-07-2019 06:54 AM. 48. 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 this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. 5. 10. x（Catalyst 9200 スイッチ）コマンドリファレンス. configure redundancy unit secondary. I Think that the righ status of SSO Configuration must be like: Hardware Mode = Duplex. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Reason: Software version. 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. Step 6. When an RP is active and the other RP is standby, SSO enables the standby RP to take over if the active RP fails. 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. 150. 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. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. 0. Cisco StackWise Virtual operates stateful switchover (SSO) between the active and standby switches. 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. Maintenance Mode = Disabled. This chapter consists of these sections:. When we simulate a problem by powering off the Active Controller, the standby controller will reboot, all of our APs loose. 90. They will reboot again. 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. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. 0. Usage Guidelines. Redundancy may not work due to differences between the Cisco. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. From Cisco IOS XE Amsterdam 17. Note SSO is not supported if the IOS-XE software is running in the LAN Base 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. This feature is supported on all controller models supporting HA SSO feature: Cisco 8500 Series Controllers . 0. For more information, see Chapter 1, “Route Processor Redundancy (RPR). 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. Router# show running-config. 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. SSO-The show module command displays Hot. SSO is supported in Cisco IOS Release 12. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating. Step 4. end. Switchover Process Restrictions † If any changes to the fabric configuration happen simultaneously with an RP switchover, the chassis is reset and all line cards are reset. Connect redundancy ports together on primary/secondary. 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. 0SG and later releases. 2. Example: Device(config-red)# mode sso: Configures stateful switchover. 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. SSO functions in networking devices (usually edge devices) that support dual RPs. In specific Cisco networking devices that support dual RPs, SSO takes advantage of RP redundancy to increase network availability. 151. 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 =. Maintenance Mode = Disabled. Redundancy may not work due to differences between the Cisco. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. Configured Redundancy. 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. end. ATM SSO is not configurable and runs by default on networking devices configured with ATM and Redundancy Mode SSO. Step 6 . If the command is not found in. To disable Cisco StackWise Virtual, use the no form of this command. Learn more about how Cisco is using Inclusive Language. 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. Redundancy Mode (Operational) = 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. Example: Device (config-red)# mode sso: Configures SSO. 2(20)EWA and later releases. Redundancy Mode Support in Cisco IOS Releases Platform Mode 12. Enter config redundancy mode SSO command to enable SSO. Sets the redundancy configuration mode to SSO on both the active and standby RP. In software, supervisor engine redundancy is enabled by running the redundant supervisor engine in route processor redundancy (RPR) or stateful switchover (SSO) operating mode. Sw-4510R (config-red)#>redundancy Sw-4510R (config-red)#mode sso Changing to sso mode will. Router(config-red)# mode sso. 39. 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. 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. Check if Auto-Boot is Enabled 6. 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. client count = 149 client_notification_TMR = 30000 milliseconds. When this command is entered, the standby switch is reloaded and begins to work in SSO mode. Step 6. The mode sso command can be entered only from within redundancy configuration mode. Stateful Switchover is particularly useful in conjunction with Nonstop Forwarding. Step 5. Current Processor Information :----- Active Location = slot 1 Current Software state = ACTIVE. 133 voor de tweede, WLC2 genoemd. 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 =. If the command is not found in the Catalyst 4500 Command Reference, it is located in the larger Cisco IOS library. (Operational) = sso Redundancy Mode (Configured) = sso Redundancy State = sso Maintenance Mode = Disabled Manual Swact = enabled Communications = Up client count = 115 client_notification_TMR = 30000 milliseconds RF debug mask = 0x0 Device# show. If it is in ROMMON, try boot with manual "boot" command. 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. ”. The Supervisor 7-E card has four uplink ports on its front panel. 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. hw-switch switch 1 logging onboard message level 3. Redundant System Information :----- Available system uptime = 44 weeks, 2 days, 6 hours, 12 minutes. 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. RPR+-The show module command displays Warm. 除了這些IP地址外. Remove SSO HA Configuration: 5. end. SSO works with Cisco NSF, which helps reduce the switchover downtime on Layer 3. 2(20)EWA and later releases. Router(config-red)# end. Redundancy may not work due to differences between the Cisco IOS. Example: Device(config-red)# mode sso: Configures stateful switchover. 2(20)EWA and later releases. To. 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 software will prompt to reboot the Standby Supervisor (in slot 5) - confirm to reboot - exit configuration mode and save the configuration. HA_CONFIG_SYNC-6-BULK_CFGSYNC_SUCCEED: Bulk Sync succeeded Switchover Process Restrictions. The New High Availability feature i. When a redundant supervisor engine runs in SSO mode, the redundant supervisor engine. EMD EARLY DEPLO. 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. 3. #sh redundancy Redundant System Information :-----Available system uptime = 6 days, 17 hours, 12 minutes Switchovers system experienced = 0 Standby failures = 0 Last switchover reason = none Hardware Mode = Simplex Configured Redundancy Mode = sso Operating Redundancy Mode = Non-redundant Maintenance Mode =. Note After configuring SSO mode, the standby RP will automatically reset. Step 4. 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. This feature also functions in an nonstop forwarding (NSF) and stateful switchover (SSO) environment. The NSF/SSO—L2VPN Pseudowire Redundancy feature enables you to set up your network to detect a failure in the network and reroute the L2 service to another endpoint that can continue to provide service. +1 is the power supply module reserved for redundancy. Step 3. SSO also synchronizes critical state information. NSF and SSO must be configured before attempting an ISSU. Book Contents Book Contents. Step 5. Step 2. 0. Both RPs must run the same Cisco IOS image. Step 5. Last switchover reason = user_forced. Configuration Examples for DHCP High Availability. Step 2: mode sso . Enters redundancy configuration mode. Step 5: end. 39. Check the Boot Mode 3. Step 2: mode sso Example: Switch (config-red)# mode sso Configures SSO. In this article, we take a look at how to configure High Availability Stateful Switchover (HA SSO) on the Cisco 9800 WLCs running IOS-XE using Redundancy Management Interfaces (RMI) in addition to the Redundancy Ports (RP). The default mode for the Cisco 7304 router and Cisco 10000 series routers is SSO. Step 5: Enabling SSO reboots the controllers to negotiate the HA role as per the configuration performed. On the Cisco 8500 Series Catalyst Edge Platform, Stateful Switchover (SSO) can be used to enable a second IOS process. Step 3: end Example: Switch (config-red)# end Returns to EXEC mode. 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. 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. Example: Device(config-red)# end: Exits redundancy configuration mode and returns to privileged EXEC mode. Enter configuration commands, one per line. SSO pair connected to upstream VSS pair with split links and RP connected back to back. Router(config)# mode sso. What is redundancy mode? 3. 5. %HA-5-MODE:Operating mode is sso, configured mode is sso. 4. Example: Device (config-red)# mode sso: Configures SSO. Enter configuration commands, one per line. † Software. SSO HSRP alters the behavior of HSRP when a device with redundant Route Processors (RPs) is configured for stateful switchover (SSO) redundancy mode. 0 !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)# end: Exits redundancy configuration mode and returns to. The processing of mirroring this information between route processors is known as checkpointing. Step 3. 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. Device # 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 =. RTR02-Sec#sh redundancy. Redundancy may not work due to differences between the Cisco IOS releases. auto-sync config-register. To set the redundancy mode to stateful switchover (SSO), use the mode sso command in redundancy configuration mode. We will definitely upgrade are fus code. Connected to network with 4x10G links. 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. It is setup in the below settings but I am not running a pair of these switches. The primary will reboot to enable sso and pull the config from the current active (secondary in this case) unit xml on boot. configure redundancy mode sso. 6. show redundancy >>>>>> check here for mode you have configured. 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. On the standby. Step 2: mode sso Example: Switch (config-red)# mode sso Configures SSO. A redundancy VLAN is connected to the redundant port on Cisco WiSM2 through the backplane. Usage Guidelines. Step 5: exit. This mode utilizes two electrical grids, each one powering a half module within each power supply. 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. The routing protocols have been enhanced with NSF-capability and. 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 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. With RPR, the backup supervisor engine is partially initialized and. Cisco 5500 Series WLCs . Enabling SSO reboots the controllers to negotiate the HA role as per the configuration performed. Uptime in current state = 4 days, 21 hours, 27 minutesYes you need the RP in order to build SSO. Example: Device (config-red)# mode sso: Configures SSO. In case of n+1 redundancy, access points are configured with primary, secondary, and tertiary controllers. 48. RPR redundancy mode is used. 10. Enters global configuration mode. Enters redundancy configuration mode. Step 1. Enters redundancy configuration mode. exit Router(config)# exit. Note • The two Gigabit Ethernet interfaces on the redundant supervisor engine are always active unless you enter the fabric switching-mode allow dcef-only command. configure redundancy mode ssoEnters redundancy configuration mode. SSO HSRP. 63 /22. When a standby supervisor engine runs in SSO mode, the standby 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. • 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 you configure the controller for HA SSO, the Cisco 600 Series OfficeExtend Access Points are not supported. Enters redundancy configuration mode. 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. 6. Example: Device(config-red)# mode sso: Configures stateful switchover. 56. The mode sso command can be entered only from within redundancy configuration mode. Configure SSO redundancy mode at this time. 0. 12. Step 3 Router# show running-config Verifies that SSO is enabled. Step 5. Step 4. Usage Guidelines. 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 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. 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. Sets the redundancy configuration mode to SSO on both the active and standby RP. Step 3:. Supervisor engine redundancy allows OIR of the redundant supervisor engine for maintenance. Here is the output from the standby while booting up:. Step 2 Router(config-red)# mode sso Configures SSO. Configuring Cisco NSF with SSO • FindingFeatureInformation,page1 • PrerequisitesforNSFwithSSO,page1 • RestrictionsforNSFwithSSO,page2. Switch# show running-config. 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. Redundancy may not work due to differences between the Cisco IOS releases. Enters redundancy configuration mode. 131. Local State = ACTIVE. The active pseudowire. Exits redundancy configuration mode and returns the switch to privileged EXEC mode. 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.