Cisco ASR1004-20G-SEC/K9 Software Guide - Page 203
High Availability Overview, Hardware Redundancy Overview on the Cisco ASR 1000 Series Routers, Routers - protection
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5 C H A P T E R High Availability Overview Cisco High Availability (HA) enables network-wide protection by providing fast recovery from faults that may occur in any part of the network. With Cisco High Availability, network hardware and software work together and enable rapid recovery from disruptions to ensure fault transparency to users and network applications. The unique hardware and software architecture of the Cisco ASR 1000 Series Routers is designed to maximize router uptime during any network event, and thereby provide maximum uptime and resilience within any network scenario. This chapter covers the aspects of High Availability that are unique to the Cisco ASR 1000 Series Routers. It is not intended as a comprehensive guide to High Availability, nor is it intended to provide information on High Availability features that are available on other Cisco routers that are configured and implemented identically on the Cisco ASR 1000 Series Routers. The Cisco IOS feature documents and guides should be used in conjunction with this chapter to gather information about High Availability-related features that are available on multiple Cisco platforms and work identically on the Cisco ASR 1000 Series Routers. This section discusses various aspects of High Availability on the Cisco ASR 1000 Series Routers and contains the following sections: • Hardware Redundancy Overview on the Cisco ASR 1000 Series Routers, page 5-1 • Software Redundancy on the Cisco ASR 1000 Series Routers, page 5-3 • Route Processor Redundancy, page 5-5 • Stateful Switchover, page 5-5 • IPsec Failover, page 5-6 • Bidirectional Forwarding Detection, page 5-6 Hardware Redundancy Overview on the Cisco ASR 1000 Series Routers Some models of the Cisco ASR 1000 Series Routers offer hardware redundancy within the same Cisco ASR 1000 Series Router through the following methods: • Allowing two Route Processors (RPs) in the same Cisco ASR 1000 Series Router • Allowing two Enhanced Services Processors (ESPs) in the same Cisco ASR 1000 Series Router No hardware redundancy is supported for the following hardware: OL-16506-10 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 5-1