Cisco ASR1000-RP2 Software Guide - Page 205
Software Redundancy on the Cisco ASR 1000 Series Routers, Software Redundancy Overview
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Chapter 5 High Availability Overview Software Redundancy on the Cisco ASR 1000 Series Routers Table 5-1 Hardware SPA SIP Hardware Redundancy Overview Support for Dual Hardware Configuration on Cisco ASR 1001 Router Support for Dual Hardware Configuration on Cisco ASR 1002 Router Support for Dual Hardware Configuration on Cisco ASR 1004 Router Support for Dual Hardware Configuration on Cisco ASR 1006 Router Failover Behavior No No No No No standby configurations are available for SPAs. If a SPA fails, that particular SPA is down and unable to forward traffic. In the event of a SPA shutdown, all other SIPs and SPAs on the router continue to be fully operational. No No No No No standby configurations are available for SIPs. If a SIP fails, all SPAs in that SIP are down and unable to forward traffic. In the event of a SIP shutdown, all other SIPs and SPAs on the router continue to be fully operational. Software Redundancy on the Cisco ASR 1000 Series Routers This section covers the following topics: • Software Redundancy Overview, page 5-3 • Second IOS Process on a Cisco ASR 1002 or 1004 Router, page 5-4 • SSO-Aware Protocol and Applications, page 5-6 Software Redundancy Overview On the Cisco ASR 1000 Series Routers, IOS runs as one of many processes within the operating system. This is different than on traditional Cisco IOS, where all processes are run within Cisco IOS. See the "IOS as a Process" section on page 1-7 for more information regarding IOS as a process on the Cisco ASR 1000 Series Router. This architecture allows for software redundancy opportunities that are not available on other platforms that run Cisco IOS software. Specifically, a standby IOS process can be available on the same Route Processor as the active IOS process. This standby IOS process can be switched to in the event of an IOS failure, and can also be used to upgrade subpackage software in some scenarios as the standby IOS process in an ISSU upgrade. OL-16506-10 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 5-3