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Communications Technologies Tips and Tricks (CT³)

Welcome to CT³, your independent source of communication technologies resources, configurations, scripts and utilities.

Design solutions Multihoming Default routing Load sharing Technologies IP routing protocols Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol (EIGRP), Integrated IS-IS, Routing Information Protocol (RIP), Protocol-Independent Multicast (PIM) IP routing IP Version 6 (IPv6), IP multicast, Static routes IP Services Network Address Translation (NAT), Domain Name System (DNS) Quality of Service (QoS), Dynamic Host Configuration Protocol (DHCP) Unified communications Security Access control Virtual Private Networks (VPN) MPLS-based VPN (MPLS/VPN) Wide-area networks Multi-protocol Label Switching (MPLS), MPLS Traffic Engineering (MPLS TE), Frame Relay Embedded network management Cisco IOS Tclsh scripts, Embedded Event Manager (EEM), Embedded Resource Manager (ERM), Embedded Menu Manager (EMM)

Resources Tutorials Cheatsheets Tcl scripts for Cisco IOS EEM applets and Tcl policies for Cisco IOS Sample configurations Utility programs and scripts Recent changes OSPF default routes Conditional OSPF default route origination based on classless IP prefixes EIGRP in MPLS VPN networks BGP Templates on MPLS VPN PE-routers External default route in NSSA area Autoroute (MPLS TE) basics Prevent DoS attacks on MPLS VPN common services Unnumbered Ethernet VLAN interfaces Understanding modern VPN service offerings Add MIB files to Wireshark SNMP decoder Mail multiple printouts from EEM applet DHCP client address change Report interface loss based on OSPF neighbor loss Detect DHCP client address change with EEM applet Regular expressions in Embedded Event Manager applets Send email from EEM applet Queuing Principles in Cisco IOS Multihoming to one ISP