C2691-advipservicesk9-mz.124-17.image |best| ⇒ <Simple>

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。

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: This segment indicates the type of software or feature set that the image is intended for. C2691-advipservicesk9-mz.124-17.image

: Advanced routing protocols (OSPF, EIGRP, BGP), IPv6 support, and Quality of Service (QoS).

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: It includes: and EIGRP (Enhanced Interior Gateway Routing

and EIGRP (Enhanced Interior Gateway Routing Protocol) for dynamic interior routing.

| Problem | Likely Cause | Solution | |---------|--------------|----------| | Router boots only to ROMmon | Bad image or insufficient DRAM | Upgrade RAM; verify checksum of image | | BGP won't establish | TCP mss mismatch | ip tcp adjust-mss 1440 on interface | | Crypto commands missing | Non-k9 image loaded | Check show version – look for k9 | | High CPU in GNS3 | Incorrect idle-pc | Use idlepc get in GNS3 console | | %SYS-2-MALLOCFAIL | Memory fragmentation | Add memory-size iomem 25 and reload | C2691-advipservicesk9-mz.124-17.image

While the Cisco 2691 was declared End-of-Life (EoL) by Cisco years ago, you will still encounter C2691-advipservicesk9-mz.124-17.image in specific environments: