December 2007
Intermediate to advanced
672 pages
19h 21m
English
book
Router Security Strategies: Securing IP Network Traffic Planes
by Gregg Schudel - CCIE No. 9591, David J. Smith - CCIE No. 1986
Content preview from Router Security Strategies: Securing IP Network Traffic Planes
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Appendix C. Cisco IOS to IOS XR Security Transition
Cisco IOS has been the mainstay for all Cisco routers for more than 20 years. This monolithic operating system, which disassociates the software architecture from hardware, has proven resilient to massive upgrades in both hardware and software technologies over the years. The term monolithic means that Cisco IOS runs as a single image and all processes share the same memory space, and that it uses a non-preemptive scheduler. In support of carrier-class IP networks, including continuous system operation and unprecedented service flexibility, the Cisco IOS XR operating system was pioneered for the Cisco CRS-1 and 12000 series platforms. Cisco IOS XR uses a real-time microkernel operating system ...
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