Cisco ASR1002-10G-VPN/K9 Software Guide - Page 206

Software Redundancy on the Cisco ASR 1000 Series Routers Chapter 5 High Availability Overview On the Cisco ASR 1006 Router, the second IOS process can run only on the standby Route Processor. Two IOS processes on the same Router Processor are not possible for any Cisco ASR 1000 Series Router that supports dual RP hardware redundancy configurations since the second Route Processor can support a standby IOS process. An overview of software redundancy is shown in Table 5-2. Table 5-2 Software Redundancy Overview Router Support for Two IOS Processes on Same Route Processor Support for a Second IOS Process on Standby Route Processor Explanation Cisco ASR 1001 Yes Router1 N/A The Cisco ASR 1001 Router only supports one RP, so dual IOS processes run on the lone RP. Cisco ASR 1002 Yes Router N/A The Cisco ASR 1002 Router only supports one RP, so dual IOS processes run on the lone RP. Cisco ASR 1004 Yes Router N/A The Cisco ASR 1004 Router only supports one RP, so dual IOS processes run on the lone RP. Cisco ASR 1006 No Router Yes The Cisco ASR 1006 Router supports a second Route Processor, so the second IOS process can only run on the standby Route Processor. 1. If a critical process, such as the ESP or the SIP fails on the Cisco ASR 1001 Router, then the entire chassis reloads. Second IOS Process on a Cisco ASR 1002 or 1004 Router For Cisco ASR 1002 and 1004 routers, Route Processor Redundancy and Stateful Switchover can be used to switch between IOS processes. RPR and SSO need to be configured by the user, however, because a second IOS process is not available by default on Cisco ASR 1002 and 1004 routers. Table 5-2 summarizes the software redundancy opportunities available with the second IOS process for the Cisco ASR 1002 and 1004 routers. Table 5-3 Software Redundancy Options for Cisco ASR 1002 and 1004 Routers Router Cisco ASR 1002 Router Cisco ASR 1004 Router Default HA Setting None None Options with 2 GB or DRAM None None Options with 4 GB or DRAM None, RPR, SSO None, RPR, SSO ISSU cannot be used to upgrade consolidated packages on Cisco ASR 1002 or 1004 Routers, and only a few subpackages can be upgraded individually using ISSU through the use of dual IOS processes on the same Route Processor. See the "Route Processor Redundancy" section on page 5-5 for more information on which subpackages can be upgraded using ISSU in a dual RP setup. Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 5-4 OL-16506-10