C3745-adventerprisek9-mz.124-25d.bin May 2026

| Parameter | Value | | :--- | :--- | | Maximum BGP routes | ~100,000 (with 256 MB RAM) | | Concurrent IPsec tunnels | ~500 (CPU bound) | | OSPF neighbors per router | ~120 | | Routing table entries | ~25,000 IPv4 (hardware limit on real 3745) | | NetFlow exports | Up to 2 exporters, 50 flows/sec max | | Boot time in GNS3 | ~25 seconds (modern i7, NVMe) |

In the networking community, this specific file is legendary because it became the "Gold Standard" c3745-adventerprisek9-mz.124-25d.bin

To start developing these features, you must first add the image to an emulator like GNS3 : | Parameter | Value | | :--- |

The "c3745-adventerprisek9-mz.124-25d.bin" is a comprehensive IOS image suitable for a Cisco 3745 router in an enterprise environment. Upgrading or installing this IOS requires careful planning, especially concerning hardware compatibility, sufficient resources, and network impact. Always follow best practices, and consider having a rollback plan in place. on real hardware: The 3745 has no hardware

on real hardware: The 3745 has no hardware acceleration for crypto . All encryption (IPsec, SSH) is done in software on the 250 MHz PowerPC CPU. For IPsec, throughput maxes around 10-15 Mbps of 3DES or AES128.