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RPR+ on Cisco 7500 Series Routers
Related Features and Technologies
Supported Standards, MIBs, and RFCs
Setting the Config-Register Boot Variable
RPR+ on Cisco 7500 Series Routers
Feature History
This feature module describes Route Processor Redundancy Plus (RPR+) on Cisco 7500 series routers in Cisco IOS Release 12.0(19)ST1. It includes information on the benefits of the new features, supported platforms, related documents, configuration examples, and a command reference.
This document includes the following sections:
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Supported Standards, MIBs, and RFCs
Feature Overview
The RPR+ feature is an enhancement of the RPR feature on Cisco 7500 series routers. RPR+ keeps the Virtual Interface Processors (VIPs) from being reset and reloaded when a switchover occurs between the active and standby route switch processors (RSPs). Because VIPs are not reset and microcode is not reloaded on the VIPs, and the time needed to parse the configuration is eliminated, switchover time is reduced to 30 to 40 seconds.
High System Availability (HSA)
8 to 10 minutes
System default.
RPR
4 to 5 minutes
RPR+
30 to 40 seconds
VIPs supported.
1 Legacy Interface Processors default to RPR. A message similar to the following is displayed during switchover:
1 %HA-2-NO_Quiesce: Slot 11 did not quiesce, it will be disabled and then reloaded.
2 Channelized Interface Processors (CIPs) do not support RPR and RPR+.
Benefits
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Restrictions
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Related Features and Technologies
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Related Documents
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Supported Platforms
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Determining Platform Support Through Feature Navigator
Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.
Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Feature Navigator home page at the following URL:
Supported Standards, MIBs, and RFCs
Standards
No new or modified standards are supported by this feature.
MIBs
No new or modified MIBs are supported by this feature.
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
None
Prerequisites
RPR+ requires a Cisco 7500 series router loaded with two RSP8s or a combination of RSP2s and RSP4s.
Configuration Tasks
See the following sections for the configuration tasks required to run RPR+:
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Copying an Image onto an RSP
Use TFTP to copy a high availability Cisco IOS image onto the active and standby RSPs:
Step 1
Router# copy tftp slotslot-number:
Address or name of remote host []? ip-addressName of file to copy []? imagename<Return>writing filename!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Destination file name? [imagename1] <Return>Accessing file 'imagename' on ip-address.. found !Loading imagename from ip-address (via Ethernet1/0/0): !Uses TFTP to copy a high availability Cisco IOS image onto the Flash memory card of the active RSP.1
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The router prompts you for the IP address of the TFTP server.
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The router prompts you for the name of the image file you are copying to the Flash memory card.
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The router prompts you to enter the name under which you want the file to appear at the destination.
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Step 2
Router# copy tftp slaveslotslot-number:
Address or name of remote host []? ip-addressName of file to copy []? imagename<Return>writing filename!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Destination file name? [imagename1] <Return>Accessing file 'imagename' on ip-address.. found !Loading imagename from ip-address (via Ethernet1/0): !Uses TFTP to copy a high availability Cisco IOS image onto the Flash memory card of the standby RSP.
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The router prompts you for the IP address of the TFTP server.
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The router prompts you for the name of the image file you are copying to the Flash memory card.
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The router prompts you to enter the name under which you want the file to appear at the destination.
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1 Before you copy a file to Flash memory, be sure there is ample space available in Flash memory. Compare the size of the file you are copying to the amount of available Flash memory shown. If the space available is less than the space required by the file you will copy, the copy process will not continue and an error message similar to the following will be displayed;
1 %Error copying tftp://image@server/tftpboot/filelocation/imagename (Not enough space on device).
Setting the Config-Register Boot Variable
Though it is not required, we recommend that you modify the software configuration register boot field so that the system boots the same image that the hw-module slotslot-number image file-spec command specified in the "Configuring RPR+" section.
Step 1
Obtains the current configuration register setting.
Step 2
Router# configure terminal
Enters configuration mode, selecting the terminal option.
Step 3
Router(config)# boot system flash slotslot-number:[imagename]
Specifies the filename of an image stored in Flash memory.
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Step 4
Router(config)# config-register value
Modifies the existing configuration register setting to reflect the way in which you want to load a system image.
value—0x0 to 0xFFFFFFFF
Step 5
Router# Ctrl-Z
Exits configuration mode.
Step 6
Router# reload
Reboots the router to make your changes take effect.
Configuring RPR+
To configure RPR+, enter the commands as shown below:
Verifying RPR+
Use the show redundancy command to verify that RPR+ is enabled:
Router# show redundancyOperating mode is rpr-plus
redundancy mode rpr-plus
hw-module slot 2 image disk0:rsp-pv-mz
hw-module slot 3 image disk0:rsp-pv-mz
The system total uptime since last reboot is 5 days, 19 hours 36 minutes.
The system has experienced 27 switchovers.
The system has been active (become master) for 5 days, 15 hours 14 minutes.
Reason for last switchover:User forced.Troubleshooting Tips
Use the commands in the table below to troubleshoot the RPR+ feature on the Cisco 7500 series routers:
Configuration Examples
This section provides the following configuration example:
Configuring RPR+ Example
In the following example, the active RSP is in slot 2 and the standby RSP is installed in slot 3 of a Cisco 7507 router.
Router# copy tftp slot0:rsp-pv-mzRouter# copy tftp slaveslot0:rsp-pv-mzRouter# configure terminalRouter(config)# hw-module slot 2 image slot0:rsp-pv-mzRouter(config)# hw-module slot 3 image slot0:rsp-pv-mzRouter(config)# redundancyRouter(config-r)# mode rpr-plusRouter(config-r)# endRouter# hw-module sec-cpu resetRouter# show running-configversion 12.0service timestamps debug uptimeservice timestamps log uptimeno service password-encryptionservice single-slot-reload-enable!hostname Router1!boot system rcp://path/to/image/rsp-boot-mzboot system tftp://path/to/image/rsp-boot-mzboot bootldr bootflash:rsp-boot-mzenable password password!redundancymode rpr-plus !--indicates Redundancy mode has been configured for RPR+!hw-module slot 2 image slot0:rsp-pv-mzhw-module slot 3 image slot0:rsp-pv-mzip subnet-zeroip rcmd remote-username router1ip cef distributedip host iphost 192.168.0.1mpls traffic-eng auto-bw timers!!controller T3 6/0/0clock source line!!interface Ethernet0/0/0ip address 10.0.0.1 255.255.0.0no ip directed-broadcastip route-cache distributedno keepalive...exec-timeout 0 0history size 40transport preferred nonetransport input noneline aux 0line vty 0 4login!endCommand Reference
This section documents the modified commands used to configure the RPR+ feature. All other commands used with this feature are documented in the Route Processor Redundancy and Fast Software Upgrade on Cisco 7500 Series Routers feature module and in the Cisco IOS Release 12.0 command reference publications.
hw-module sec-cpu reset
To reset and reload the standby RSP with the specified Cisco IOS image and execute the image, use the hw-module sec-cpu reset command in privileged EXEC mode.
hw-module sec-cpu reset
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
12.0(16)ST
This command was introduced.
12.0(19)ST1
This command was enabled in privileged EXEC mode.
Usage Guidelines
Before using this command, you must use the hw-module slot image configuration command to specify a high availability Cisco IOS image to run on the standby RSP. After the high availability image is loaded in the active RSP, use the hw-module sec-cpu reset command to reset and reload the standby RSP with the specified Cisco IOS image and execute the image. To load the standby RSP with the bundled micro-IOS contained in the active RSP image, use the no form of the hw-module slot image command followed by the hw-module sec-cpu reset command.
Examples
The following example shows a Cisco 7513 router with the standby RSP loaded in slot 7. The standby RSP is reset and reloaded with the rsp-pv-mz high availability Cisco IOS image. Both RSPs have slot 0 Flash memory cards:
Router(config)# hw-module slot 7 image slot0:rsp-pv-mzRouter(config)# endRouter# hw-module sec-cpu resetRelated Commands
hw-module slot image
Specifies a high availability Cisco IOS image to run on an active or standby RSP.
mode (redundancy)
To configure the high availability mode, use the mode command in redundancy configuration mode. To use the default redundancy mode, use the no form of this command.
mode {hsa | rpr | rpr-plus}
no mode {hsa | rpr | rpr-plus}
Syntax Description
hsa
Selects High System Availability redundancy mode.
rpr
Selects RPR redundancy mode.
rpr-plus
Selects RPR+ redundancy mode.
Defaults
High System Availability redundancy mode
Command Modes
Redundancy configuration
Command History
12.0(16)ST
This command was introduced.
12.0(19)ST1
The rpr-plus keyword was added.
Usage Guidelines
The mode selected by the mode command in redundancy configuration mode must be fully supported by the image that has been set into both the active and standby RSPs. A high availability image must be installed into the RSPs before RPR+ can be configured. Use the hw-module slot image command to specify a high availability image to run on the standby RSP.
If the mode cannot be set on both RSPs, HSA is the default mode. A Cisco 7507 or Cisco 7513 router that has only one RSP installed operates in single Route Processor mode.
Examples
The following example enters redundancy configuration mode and sets RPR+ as the redundancy mode for a Cisco 7500 series router.
Router(config)# redundancyRouter(config-r)# mode rpr-plusRouter(config-r)# endRelated Commands
Glossary
Active RSP—The RSP that controls and runs the routing protocols, and presents the system management interface.
FSU—Fast Software Upgrade. A mechanism to upgrade the Cisco IOS software images on RSPs and line cards without reinitializing the entire system. When FSU is configured, the router is in RPR redundancy mode.
HSA—High System Availability. HSA enables a system to reset and use a standby RSP in the event of a failure of the active RSP.
RPR—Route Processor Redundancy. An alternative to HSA that reduces unplanned downtime.
RPR+—Route Processor Redundancy Plus. An enhancement to RPR in which the standby RSP is fully initialized. An RPR+ switchover does not involve line card reset or line card software reload for VIPs. Legacy Interface Processors are reset and reloaded during switchover.
RSP—Route Switch Processor. The Route Processor on the Cisco 7500 series router.
Standby RSP—The RSP that waits ready to take over the functions of the active RSP in the event of unplanned or planned downtime.
Copyright © 2005 Cisco Systems, Inc. All rights reserved.
