BGP Table Statistics: Graphs and reports on the number of BGP routes, network blocks, and the IP and IPv6 address spaces.
Cisco - QoS Technical Tips: Provides tips directly from Cisco's Technical Assistance Center (TAC) engineers to help you with Quality of Service (QoS) issues.
Cisco IP Routing: Technologie overview about BGP, EIGRP, IGRP, IS-IS, OSPF and RIP.
Howstuffworks "How Routers Work": Routers are such a vital component of the Internet that the Internet literally could not exist without them. Find out exactly how routers work and why they are so important!
Interior Gateway Protocols: Tutorial slide presentation on interior routing protocols like RIP and OSPF.
Internetwork Design Guide: This publication provides internetworking design and implementation information and helps you identify and implement practical internetworking strategies that are both flexible and scalable
Introduction to LAN Protocols: This document introduces the various media-access methods, transmission methods, topologies, and devices used in a local-area network (LAN).
Overview of Routing between Virtual LANs: This document provides an overview of virtual LANs (VLANs). It describes the encapsulation protocols used for routing between VLANs and provides some basic information about designing VLANs.