The Longest Match Routing Rule

Routing to any destination is always done on a longest match basis: A router that has to decide between two different length prefixes of the same network will always follow the longer mask. Suppose, for example, that a router has the following two entries in its routing table: 198.32.1.0/24 via pat...

Classful Routing: Summarization at Boundary Routers

A question arises from the preceding discussion: How does a RIP process interpret the subnet of a major network if it has no interfaces attached to that network? Without an interface on the class A, B, or C  network of the destination, the router has no way of knowing the correct subnet mask to...

Cisco VPN Client Interface

The Cisco VPN Client for Windows supports two interfaces: CLI and GUI. This book will focus on the GUI interface of the 4.6 client. Once you have installed the client, go to Start > Programs > Cisco VPN Software Client > VPN Client to access the GUI. Sometimes the application is referred to...

OSPF Router Types

When an OSPF network grows beyond a single area, you need to be aware of the role played by each OSPF router in a topology. Specifically, four OSPF router types exist:

QoS over MPLS

For this example, we will take a relatively simple view that the PE router will trust the CE router's DSCP/IP Precedence settings and map them to the MPLS EXP traffic priority field in a simple way. So we will focus on the configuration required on the PE and P routers to make use of this informati...

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