Legitimate copies should be obtained through the Cisco Software Central portal, which requires a valid service contract (SMARTnet).

Verify that your router has sufficient flash memory and RAM to support this IOS image.

: Legitimate downloading requires:

Because it’s an "Adventerprise" image, it supports almost every protocol needed for labbing, including MPLS and advanced IPv6.

Recommended values for emulation to reduce CPU usage are 0x60c09aa0 or 0x60c08728 . MD5 Checksum: 42baf17af10d9a1471bf542f0bfd07c7 . 2. Emulation and Lab Use