!!install!!: C2691-advipservicesk9-mz.124-17.image

: At least 192MB (though 128MB may work for basic labs).

Network simulators like GNS3 utilize Dynamips to emulate real Cisco hardware using actual binary images. The 2691 image is highly favored over standard 2600 series images because:

Router# reload

Enables robust security features including IP Security (IPsec) VPNs, stateful firewalls, and complex access control lists (ACLs).

The is a legacy but highly significant Cisco IOS software image designed for the Cisco 2691 Multiservice Router series. Running on IOS Version 12.4(17), this "Advanced IP Services" image is a comprehensive operating system tailored for enterprise-edge applications, offering a robust blend of routing, security, and voice capabilities. C2691-advipservicesk9-mz.124-17.image

The advipservicesk9 feature set is the heart of this image, equipping the C2691 with enterprise-grade capabilities that make it an excellent choice for complex lab simulations. It includes:

支持可存活远程地点电话（SRST），为IP语音通信提供本地冗余支持，即使与总部之间的WAN链路中断，分支机构的内部通话也不会受影响。 : At least 192MB (though 128MB may work for basic labs)

Emulation allows you to build multi-router topologies with BGP, OSPF, and MPLS without buying physical hardware.