1 course number presentation_id © 2001, cisco systems, inc. all rights reserved. cisco 7500 high...
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1Course NumberPresentation_ID © 2001, Cisco Systems, Inc. All rights reserved.© 2001, Cisco Systems, Inc. All rights reserved.© 2001, Cisco Systems, Inc. All rights reserved.
Cisco 7500 High Availability
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Cisco 7500 Before HA – High System Availability
• Cold standby solution before HA
• Active RSP and Standby RSP Previously referred to as Master RSP and Slave RSP
• Upon failure, system resets and previous Standby RSP becomes Active
• Allows automatic system recovery
• Can take 8 to 10 minutes depending on configuration
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Cisco 7500 High Availability Features
• Single Line Card Reload (SLCR)
• Route Processor Redundancy (RPR)
• Fast Software Upgrade (FSU)
• Route Processor Redundancy Plus (RPR+)
• IOS High Availability –
Stateful SwitchOver & Non-Stop Forwarding
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Single Line Card Reload
Route Switch Processors
VIPVIPVIP VIP
• When a VIP crashes, it is isolated from the rest of the system and reloaded
• The rest of the system continues forwarding packets with little interruption
• SLCR supports VIP4, VIP2, VIP-based IP, and legacy IP
• SLCR can handle up to two simultaneous line card crashes
Rest of system only minimally
affected
Crash isolated, line card recovery
accelerated
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Single Line Card Reload (cont.)
• SLCR is supported in 12.0(13)S, 12.0(14)ST, 12.1(4)T and 12.1(5)E
• SLCR is disabled by default, and needs to be manually configured
• SLCR can be configured with the following command
Router(config)# service single-slot-reload-enable
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Route Processor Redundancy
Route Switch Processors
VIPVIPVIP VIP
• Accelerates switchover to Standby RSP when Active RSP fails
• Same IOS image on Active and Standby RSPs
• Full software image pre-initialized on Standby RSP, which takes over from Active RSP (after a crash, redundancy force-switchover, or OIR removal of Active RSP)
• Switchover resets all line cards and parses config from NVRAM
• Reduces recovery time from 8-10 minutes (HSA) to 4-5 minutes
• Supports RSP2, RSP4/RSP4+, and RSP8
Standby RSP pre-initialized for speedy cutover
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• RPR is supported in 12.0(16)ST
• RPR requires two RSP8s or any combination of RSP2s and RSP4s
RSP2/2, RSP2/4, RSP4/4, RSP8/8
Same RSP combination support as HSA
• Default redundancy mode is HSA, so RPR needs to be manually configured
Route Processor Redundancy (cont.)
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RPR Configuration Commands
• Router(config)# hw-module slot<RSP slot#> image <file-spec>
specifies IOS image for each RSP in RPR re-initializations, required for both RSPs, no tftp/rcp, not related to “boot system flash“ command which is used at reload
• Router(config)# redundancy
enters redundancy mode
• Router(config-r)# mode rpr
sets redundancy mode to RPR
• Router(config)# slave auto-sync config
just in case auto-sync (on by default) has been disabled
• Router# copy running-config startup-config
saves configuration
• Router# hw-module sec-cpu reset (slave reload also works)
resets and reloads Standby RSP with specified image
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Fast Software Upgrade
Route Switch Processors
VIPVIPVIP VIP
• An “application” of RPR to accelerate software upgrade
• Preload Standby RSP with upgraded IOS image, initialize, and switchover
• Reduces downtime of SW upgrade operation to 4-5 minutes
• Requires the Active and Standby images to be FSU-compatible
Standby RSP loaded with new software image
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FSU Configuration Commands
• Router(config)# hw-module slot<RSP slot#> image <file-spec>
specifies IOS image for each RSP in RPR re-initializations, required for both RSPs, no tftp/rcp, not related to “boot system flash“ command which is used at reload
• Router(config)# redundancy
enters redundancy mode
• Router(config-r)# mode rpr
sets redundancy mode to RPR, there is no FSU mode
• Router(config)# slave auto-sync config
just in case auto-sync (on by default) has been disabled
• Router# copy running-config startup-config
saves configuration
• Router# hw-module sec-cpu reset (slave reload also works)
resets and reloads, will flag error if Standby image not FSU-compatible with Active
• Router# redundancy force-switchover
forces switchover to Standby RSP, this command works on rpr, rpr-plus, and sso
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Route Processor Redundancy +
• Further accelerates switchover to Standby RSP
• Same IOS image on Active and Standby RSPs
• Full software image pre-initialized on Standby RSP, which takes over from Active RSP (after a crash, redundancy force-switchover, or OIR removal of Active RSP)
• Running-config is sync’d on Standby RSP, switchover does not reset line cards and does not parse config from NVRAM
• Reduces recovery time down to 30-40 seconds
• Supports RSP2, RSP4/RSP4+, and RSP8
Route Switch Processors
VIPVIPVIP VIP
Standby RSP pre-initialized for speedy cutover
No need to reload the VIPs
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• RPR+ is supported in 12.0(19)ST1
• RPR requires two RSP8s or any combination of RSP2s and RSP4s
RSP2/2, RSP2/4, RSP4/4, RSP8/8
Same RSP combination support as HSA
• Default redundancy mode is HSA, so RPR+ needs to be manually configured
• Standby RSP in RPR+ keeps a running-config which is auto-sync’d to running-config of Active RSP to further accelerate switchover
• RPR+ requires same image on Active and Standby RSPs, otherwise it will fall back to RPR even if configured as RPR+
• RPR+ supports VIPs, and up to two legacy IPs if SLCR is configured (the legacy IPs will be reset by RPR+), otherwise it falls back to RPR
• Pulling out an Active RSP to force a switchover will fall back to RPR
Route Processor Redundancy+ (cont.)
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RPR+ Configuration Commands
• Router(config)# hw-module slot<RSP slot#> image <file-spec>
specifies IOS image for each RSP in RPR re-initializations, required for both RSPs, no tftp/rcp, not related to “boot system flash“ command which is used at reload
• Router(config)# redundancy
enters redundancy mode
• Router(config-r)# mode rpr-plus
sets redundancy mode to RPR+
• Router(config)# slave auto-sync config
just in case auto-sync (on by default) has been disabled
• Router# copy running-config startup-config
saves configuration
• Router# hw-module sec-cpu reset (slave reload also works)
resets and reloads Standby RSP with specified image
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• Based on RPR+
• Standby RSP in SSO maintains the states of key routing and interface protocols and more
BGP, OSPF, IS-IS, PPP, ATM, FR, HDLC, NAT, …..
• To be available in 12.0(22)S which will support all HA features
• Router(config)# redundancy
enters redundancy mode
• Router(config-r)# mode sso
sets redundancy mode to SSO
• NSF requires routing peers to cooperate in maintaining routing protocol states on the network
Stateful SwitchOver & Non-Stop Forwarding
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To Verify High Availability Operation
Router# show redundancy
Operating 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 ...
The system has experienced 2 switchovers.
The system has been active (become master) for ...
Reason for last switchover:User forced.
Note: It takes a few minutes after resetting the Standby RSP for it to become fully initialized and sync’d to function in the configured redundancy mode.
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• Make sure the Standby RSP config is sync’d with the Active RSP
• Always do hw-module sec-cpu reset after changing HA modes
• redundancy force-switchover will automatically check that the startup-configs on the Active and Standby RSPs are the same, otherwise it will issue a warning message/prompt
• Use of Y-cable for console access is recommended
• Direct console access to Standby RSP works, but do not issue any commands or config changes to Standby RSP
• For crash diagnosis, crashinfo can be obtained from bootflash on standby (previously active) RSP after switchover
• Wait one minute between OIR operations
Notes on HA Operations
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