List of Figures

Figure 1: Router Architecture

Figure 2: Routing and Forwarding Table Updates

Figure 3: Data Flow Through an M40e Router

Figure 4: Data Flow Through a T640 Routing Node

Figure 5: Process for Diagnosing Problems in Your Network

Figure 6: Network with a Problem

Figure 7: Levels in an IS-IS Network Topology

Figure 8: IS-IS Network Topology with Details

Figure 9: IS-IS Network Topology

Figure 10: Multi-Area OSPF Network Topology

Figure 11: OSPF Network Topology with Details

Figure 12: OSPF Network Topology

Figure 13: LSA Flooding Scopes

Figure 14: BGP Configuration Topology

Figure 15: BGP Network Topology

Figure 16: BGP Network Topology

Figure 17: Topology for ping and traceroute Command Examples

Figure 18: Chassis MIB Tree

Figure 19: System Application MIB Tree

Figure 20: Chassis MIB Tree

Figure 21: System Application MIB Tree

Figure 22: Three Areas Where a Software Crash Can Occur