Networking World

Performance
Performance means how many packets per second the router could forward. For example, a Cisco 2600 series routers can forward an estimated 15,000 packets per second

Feature Upgradability
Router processors are rarely upgradeable, so this concerns to RAM and Flash.

Feature Expandability
Number of WAN and LAN interfaces supported by the router.

Software features
For example, you might need a router to support a certain interfaces for future or features like VOIP,QOS etc

Integrated services
This refers to functionality supported by a router that previously required separate boxes. For example, by adding a 16- or 32-port switching module in a router negates the need for an Ethernet switch; having a firewall, VPN server, and IDS/IPS sensor in a router can negate the need for a firewall, VPN concentrator, and dedicated IDS/IPS appliance.

Manageability
The router supports GUI interface, or is it command line only? Is there an interface available that allows you to manage multiple routers.

Redundancy
Redundancy is a critical feature for the network? Redundancy examples include hot-swappable power supplies or high-availability routing protocols such as HSRP or VRRP.

Support and reliability

Cisco traditionally offers a high level of support.