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GRP Redundant Processor Support 1

GRP Redundant Processor Support

Feature Summary

The GRP redundant processor feature allows you to install two gigabit route processors (GRPs) in a

Cisco 12000 series router. One GRP functions as the primary processor. The primary GRP supports

all normal GRP operation. The other GRP functions as the secondary processor. The secondary GRP

monitors the primary and will take over normal GRP operations if it detects a failure in the primary

GRP.

The GRP redundant processor feature is not a hot standby system wherein the secondary GRP

duplicates the state of the primary. The beneﬁt of having the secondary GRP monitor the primary,

rather than duplicate the primary, is that a software failure is unlikely to affect both processors. The

tradeoff is that network services will be disrupted while the secondary GRP takes over and the router

recovers. The recovery happens faster, however, than if the router performed a cold restart.

The primary and secondary GRP can be placed in any available card slot in the router chassis. You

may want to consider physical access and cable locations when choosing where to place the GRPs.

Each GRP must have the resources to run the router on its own, which means all GRP resources are

duplicated. In other words, each GRP has its own Flash device, Ethernet, serial, and console port

connections. The console port connections do not use a “Y” cable. Instead, you connect a separate

terminal console cable and monitor to each GRP.

You can access the secondary GRP resources while it is in standby mode. For example, you can use

the copy EXEC command to transfer an image to the secondary GRP ﬂash device. (Refer to “Device

Access,” later in this publication.) By default, the startup-conﬁg on the secondary GRP is always

synchronized to the startup-conﬁg on the primary.

There are two common ways to use GRP redundant processor support. You can run identical Cisco

IOS software on both GRPs, which protects against GRP hardware failure. Alternatively, you can

run different Cisco IOS images on each GRP. This method is useful, say, when you want to run a

newer Cisco IOS image on one GRP and revert to an older Cisco IOS image if you encounter

problems.

Beneﬁts

The GRP is no longer a single point of hardware failure. Any permanent hardware failure in the

primary GRP is recovered by the secondary GRP, which increases the level of network service and

reliability demanded by customers.

The GRP redundant processor feature is implemented with no impact on the GSR per-line switching

performance, where packet routing is performed by Cisco express forwarding (CEF) in the line

cards.

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Sommario

Pagina 1 - Feature Summary

GRP Redundant Processor Support 1GRP Redundant Processor SupportFeature SummaryThe GRP redundant processor feature allows you to install two gigabit

Pagina 2 - Supported MIBs and RFCs

Configuration Tasks10Cisco IOS 11.2(15)GS2Conﬁgure Redundancy on the Installed GRPTo conﬁgure the installed GRP for redundancy operation, perform the

Pagina 3 - Functional Description

Install the New GRP and Boot to ROM Monitor Prompt GRP Redundant Processor Support 11Install the New GRP and Boot to ROM Monitor PromptTo this point,

Pagina 4 - Device Access

Configuration Tasks12Cisco IOS 11.2(15)GS2Boot the Primary and Secondary GRPs in SequenceFor the ﬁnal phase of preparing your router to operate with r

Pagina 5

Verify and Update Cisco IOS Software on Secondary GRP GRP Redundant Processor Support 13Verify and Update Cisco IOS Software on Secondary GRPAfter the

Pagina 6 - Additional GRPs

Configuration Tasks14Cisco IOS 11.2(15)GS2Note We recommend that you maintain identical ﬁles in the primary and secondary Flash devices.Although not s

Pagina 7 - Conﬁguration Tasks

Configure A Preferred Primary GRP Redundant Processor Support 15Conﬁgure A Preferred PrimaryThe arbitration process determines which GRP will become t

Pagina 8 - Conﬁguration Tasks Overview

Configuration Tasks16Cisco IOS 11.2(15)GS2Monitor and Maintain GRP Redundant Processor Operation Task ListTo monitor and maintain GRP redundant proces

Pagina 9 - Install Firmware Upgrades

Alphanumeric LED Messages GRP Redundant Processor Support 17Alphanumeric LED MessagesTable 2 shows additional alphanumeric LED messages that may be di

Pagina 10

Command Reference18Cisco IOS 11.2(15)GS2Command ReferenceThis section documents new or modiﬁed commands. All other commands used with this feature are

Pagina 11

auto-sync GRP Redundant Processor Support 19auto-syncUse the auto-sync main-CPU redundancy conﬁguration command to deﬁne whether thestartup-conﬁg, boo

Pagina 12 - Verify Redundant Operation

Platforms2Cisco IOS 11.2(15)GS2RestrictionsThis section describes situations you must avoid and other considerations relevant to using GRPredundant pr

Pagina 13

Command Reference20Cisco IOS 11.2(15)GS2hw-module boot systemUse the hw-module boot system global conﬁguration command to deﬁne system boot parameters

Pagina 14

hw-module boot system GRP Redundant Processor Support 21You can also enter several boot system commands to provide a fail-safe method for booting your

Pagina 15 - Conﬁgure A Preferred Primary

Command Reference22Cisco IOS 11.2(15)GS2hw-module conﬁg-registerUse the hw-module conﬁg-register global conﬁguration command to deﬁne different system

Pagina 16

hw-module secondary reload GRP Redundant Processor Support 23hw-module secondary reloadUse the hw-module secondary reload EXEC command to reload the d

Pagina 17 - Conﬁguration Example

Command Reference24Cisco IOS 11.2(15)GS2main-cpuUse the main-cpu redundancy conﬁguration command to enter main-CPU conﬁguration mode.main-cpuSyntax De

Pagina 18 - Command Reference

redundancy GRP Redundant Processor Support 25redundancyUse the redundancy global conﬁguration command to enter redundancy conﬁguration mode.redundancy

Pagina 19

Command Reference26Cisco IOS 11.2(15)GS2redundancy force-failoverUse the redundancy force-failover EXEC command to force the secondary GRP to become t

Pagina 20 - Syntax Description

redundancy prefer GRP Redundant Processor Support 27redundancy preferUse the redundancy prefer EXEC command to deﬁne which card slot in a Cisco 12000

Pagina 21 - Related Commands

Command Reference28Cisco IOS 11.2(15)GS2show bootUse the show boot EXEC command to display GRP boot information.show bootSyntax DescriptionThis comman

Pagina 22 - Cisco IOS 11.2(15)GS2

show boot GRP Redundant Processor Support 29Related Commandshw-module conﬁg-registerredundancy preferCONFGEN variable = 419 Conﬁguration sequence numb

Pagina 23

Booting and System Images GRP Redundant Processor Support 3Functional DescriptionThis section provides additional information on GRP redundant process

Pagina 24

Command Reference30Cisco IOS 11.2(15)GS2show redundancyUse the show redundancy EXEC command to display redundancy status information.show redundancy [

Pagina 25

show redundancy GRP Redundant Processor Support 31The following example displays arbitration GRP redundancy information in the Cisco 12000:show redund

Pagina 26

Command Reference32Cisco IOS 11.2(15)GS2The following example displays all GRP redundancy information from the Cisco 12000:show redundancy allPrimary

Pagina 27

show redundancy GRP Redundant Processor Support 33Table 4 describes selected ﬁelds from the show redundancy command output. Not all ﬁelds aredescribed

Pagina 28

Debug Commands34Cisco IOS 11.2(15)GS2Debug CommandsThis section describes debug commands and test commands useful for troubleshooting the GRPredundanc

Pagina 29

Functional Description4Cisco IOS 11.2(15)GS2Choosing the correct primary GRP is important. If only one of the two GRPs has a valid startup-conﬁg, that

Pagina 30 - Examples

Local Ethernet GRP Redundant Processor Support 5Note When the startup conﬁguration is updated with copy [tftp | rcp | ... ] startup-conﬁg, andauto-syn

Pagina 31

Functional Description6Cisco IOS 11.2(15)GS2The failover event is logged, and can be viewed via the show redundancy arbitration EXECcommand.Field Diag

Pagina 32

Using GRP Redundancy for Hardware and Software Protection GRP Redundant Processor Support 7Note More than two GRPs installed in a chassis is not suppo

Pagina 33

Configuration Tasks8Cisco IOS 11.2(15)GS2You must have a version of Cisco IOS software installed that supports the GRP redundant processorfeature in a

Pagina 34 - Debug Commands

Verify Cisco IOS Software Version on the Installed GRP GRP Redundant Processor Support 9Verify Cisco IOS Software Version on the Installed GRPTo verif