Chapter 2. Policy-Based Network Management
Routers have become quite complex when compared to their original task of simply routing. To name a few features: routers now provide QoS, firewall, packet-encryption, tunneling, filtering and web-caching capabilities. These features require that multiple routers be configured similarly in order to be able to deliver a consistent level of capabilities. If QoS packet coloring and queuing features, for example, are not implemented consistently through your network, packets will not be colored and queued similarly as they travel through the network.
Likewise, Layer 2 LAN switches have become more complex since their original bridging intentions. Some Catalyst switches now make forwarding decisions based ...
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