| Feature | Throughput (without encryption) | With AES-256 (DMVPN) | | :--- | :--- | :--- | | Fast Ethernet (FE) | 98 Mbps | 45 Mbps | | Gigabit (via HWIC) | 190 Mbps (max bus limit) | 40 Mbps | | BGP table (full internet) | Unstable (CPU 99%) | Not recommended | | OSPF (100 routes) | < 15% CPU | 25% CPU |
Router(config)# ip ssh version 2 Critics argue that 15.2 is too heavy for the 2800’s CPU (a RISC Qorlo at ~300-400 MHz). However, empirical tests show:
| Router Model | DRAM Required | Flash Required | Suitable for this image? | | :--- | :--- | :--- | :--- | | | 512 MB | 128 MB | Yes (with upgrades) | | Cisco 2811 | 512 MB (768 MB recommended) | 128 MB | Yes | | Cisco 2821 | 512 MB | 128 MB | Yes | | Cisco 2851 | 512 MB | 128 MB | Yes | c2800nm adventerprisek9 mz 152 1 full
This filename is more than just a string of characters; it is a roadmap to the router's capabilities. This article provides an exhaustive analysis of this specific IOS version, covering its feature set, hardware compatibility, security implications, and a step-by-step upgrade procedure. Before evaluating performance or features, one must understand the nomenclature. Cisco’s IOS naming convention is methodical. Here is the breakdown of c2800nm-adventerprisek9-mz.152-1.full :
Router# copy tftp: flash: Address or name of remote host [255.255.255.255]? 192.168.1.100 Source filename? c2800nm-adventerprisek9-mz.152-1.full Destination filename? [c2800nm-adventerprisek9-mz.152-1.full] Accessing tftp://192.168.1.100/c2800nm-adventerprisek9... [OK] Router# configure terminal Router(config)# no boot system Router(config)# boot system flash:c2800nm-adventerprisek9-mz.152-1.full Router(config)# config-register 0x2102 (boots into IOS; 0x2101 for ROMmon) Router(config)# end Step 5: Save and Reload Router# write memory Router# reload Do not interrupt the power during reload. The first boot will take 3-5 minutes as the image decompresses. Part 5: Common Pitfalls and Troubleshooting Even experienced engineers encounter problems with this specific image. Problem A: "Processor memory (RAM) 256 MB, insufficient for 15.x" Solution: The router will cycle with error: *** System received a Software forced crash *** . You cannot bypass this. Source a DRAM upgrade (e.g., Cisco MEM2851-512U512). Problem B: Feature License Missing After booting adventerprisek9 , you might see: %LICENSE-3-NO_LICENSE_FOUND: No feature license found for feature ipseck9... | Feature | Throughput (without encryption) | With
Router# license accept end user agreement Router# license boot level adventerprisek9 Older 2800 routers with this image default to SSH v1.99. To enforce secure v2:
The "full" image size is approximately 54–58 MB. The base flash on many 2800 series routers is only 64 MB. After formatting, you may have insufficient space. Always verify available flash with show flash: before attempting the upgrade. This article provides an exhaustive analysis of this
The adventerprisek9 requires a license file stored in flash: . Fortunately, for the 2800 series end-of-life devices, Cisco released universal images. Enter: