Cisco Systems 4000 manual Main Memory Requirements

Memory Systems

Note For more information, see product bulletin number 419, “Memory Options for Cisco 4000 Series,” on the Web at http://www.cisco.com. This bulletin contains information such as minimum memory requirements for each Cisco IOS image, current shared memory requirements, and sample configurations.

Main Memory Requirements

The amount of main memory required by a Cisco 4000 series router is affected by the size of the network and by the access list configurations. However, it is difficult to quantify the exact main memory requirements based only on network size. Use the following guidelines to determine approximate main memory requirements.

Note If your memory requirements fall near the upper end of one of the available main memory options, consider installing the next larger memory option to allow for network growth.

Main memory requirement guidelines for Cisco 4000 series routers are as follows:

•The 4 MB of main memory standard in the Cisco 4000-M will only suffice on routers with knowledge of very small networks and which run very few protocols.

•The 8 MB of main memory standard in the Cisco 4500-M and the 16 MB of main memory standard in the Cisco 4700-M generally suffices on routers running Cisco IOS Release 10.2.

•16 MB of main memory, optional in the Cisco 4500-M and standard in the Cisco 4700-M, generally suffices on routers using Cisco IOS Release 10.3 or later.

•The 64 MB main memory option for the Cisco 4700-M is recommended for routers using Border Gateway Protocol (BGP).

Overview of the Cisco 4000 Series Routers 1-13