BGP Route Aggregation is not only an important topic to learn for the CCIE exam, its what keeps the internet routing tables manageable. The basic idea is simple, instead of BGP advertising lots of different prefixes, we can summarize individual prefixes as an aggregate. In this series of articles we will be looking at BGP Route Aggregation using various methods that you should be familiar with before attempting the CCIE lab.

In our last article on filtering Routes in OSPF we looked at filtering routes within an OSPF area. In this article we will be filtering routes between areas using the area filter-list command. OSPF route filtering is an important concept to be familiar with for any CCIE candidate. We will be looking at the area filter-list command first. Part 3 will then look at some of the more obtuse ways of filtering using the area range and summary-address commands. Part of being a CCIE is knowing multiple ways of configuring the same task…just in case those evil proctors decide to restrict which of those methods you can and can’t do!

Knowing the OSPF Network Types and how they work with different frame relay topologies is one of those things that you should know inside out if you are attempting the CCIE lab. This five part series of tutorials are designed to take you through all the different OSPF network types and demonstrate how they interact with Frame-Relay over various partial-mesh topologies.

In my previous tutorials we looked at the different OSPF Network types and also how they interact with each other. In this tutorial we will be looking at implementing OSPF over a partial mesh Frame-Relay network with multiple hubs and spokes. This is the last of the OSPF Network Types and Frame Relay series of articles….unless I find something cool!

In addition to knowing all the different OSPF Network Types and how they relate to Frame-Relay, a CCIE candidate must be familiar with the different methods of filtering routes in OSPF. This two part series of tutorials will focus on filtering routes in OSPF, both within an area and between areas. This tutorial will focus on filtering routes within an area using distribute-lists, access-lists and using a route-map.

In our previous article on IPv6 tunnels, we looked at manual GRE and IPv6IP Tunnels in order to provide connectivity for IPv6 networks segregated by an IPv4 network. By tunneling IPv6 over IP, we can migrate our internal networks to IPv6 and still have communication between these networks, even though we are seperated by an IPv4 network. In this article we will be using another method to provide connectivity for IPv6 networks segregated by an IPv4 network: The Automatic 6to4 Tunnel! Mastering IPv6 is not only an important part of a CCIE candidates journey, but will become increasingly important as the global pool of IPv4 addresses diminishes….

Time based ACLS are useful when you want to restrict traffic based on time of day. For example, you might employ time based ACLs if you wanted to only allow web surfing during a particular time of day or allow access to a server during work hours. We will be exploring these scenarios in this tutorial.