Cisco ASR1002-5G-SHA/K9 Software Guide - Page 23
IOS as a Process, Process, Purpose, Affected FRUs, SubPackage, Mapping
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Chapter 1 Software Packaging and Architecture Processes Overview Table 1-2 Individual Processes (continued) Process Purpose Affected FRUs SubPackage Mapping Forwarding Manager Manages the downloading of configuration to each of the ESPs and the communication of forwarding plane information, such as statistics, to the IOS process. RP (one per software RPControl redundancy instance per RP). Maximum of two instances per RP. ESP (one per ESP) ESPBase Pluggable Services The integration point between platform policy application, such as authentication and the IOS process. RP (one per software redundancy instance per RP). Maximum of two instances per RP. RPControl Shell Manager Provides all user interface features and handling related to features in the nonIOS image of the consolidated package, which are also the features available in diagnostic mode when the IOS process fails. RP (one instance per RP) RPControl SPA driver process Provides an isolated process SPA (one instance per SIPSPA driver for a specific SPA. SPA per SIP) CPP driver process Manages the CPP hardware ESP (one instance per ESPBase forwarding engine on the ESP. ESP) CPP HA process Manages HA state for the CPP ESP (one instance per ESPBase hardware forwarding engine. ESP) CPP SP process Performs high-latency tasks for the CPP-facing functionality in the ESP instance of the Forwarding Manager process. ESP (one instance per ESPBase ESP) IOS as a Process In almost all previous Cisco router platforms, an overwhelming majority of the internal software processes are run using Cisco IOS memory. The Cisco ASR 1000 Series Routers introduce a distributed software architecture that moves many operating system responsibilities out of the IOS process. In this architecture, IOS, which previously was responsible for almost all of the internal software processes, now runs as one of many Linux processes while allowing other Linux processes to share responsibility for running the router. This architecture allows for better allocation of memory so the router can run more efficiently. Furthermore, the Cisco ASR 1000 Series Routers has a command-line interface in diagnostic mode that can be accessed in certain scenarios even if the IOS process fails. See the "Understanding the Diagnostic Mode" section on page 2-7 for information on diagnostic mode. OL-16506-10 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 1-7