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1 Course Number Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. Cisco 7500 High Availability.

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Presentation on theme: "1 Course Number Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. Cisco 7500 High Availability."— Presentation transcript:

1 1 Course Number Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. Cisco 7500 High Availability

2 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 2 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 2 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 2 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

3 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 3 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 3 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 3 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

4 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 4 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 4 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 4 Single Line Card Reload Route Switch Processors 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

5 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 5 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 5 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 5 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

6 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 6 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 6 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 6 Route Processor Redundancy Route Switch Processors 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

7 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 7 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 7 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 7 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.)

8 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 8 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 8 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 8 RPR Configuration Commands Router(config)# hw-module slot image 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

9 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 9 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 9 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 9 Fast Software Upgrade 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

10 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 10 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 10 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 10 FSU Configuration Commands Router(config)# hw-module slot image 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

11 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 11 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 11 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 11 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 seconds Supports RSP2, RSP4/RSP4+, and RSP8 Route Switch Processors VIP Standby RSP pre-initialized for speedy cutover No need to reload the VIPs

12 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 12 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 12 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 12 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.)

13 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 13 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 13 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 13 RPR+ Configuration Commands Router(config)# hw-module slot image 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

14 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 14 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 14 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 14 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

15 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 15 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 15 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 15 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.

16 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 16 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 16 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved. 16 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

17 17 Cisco Confidential © 2001, Cisco Systems, Inc. All rights reserved.


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