Network Warrior, 2nd Edition

Chapter 34. The Converged Network

In this chapter, you’ll see a converged network in action. While the network will be very simple, the principles shown will scale to networks and links of almost any size.

Figure 34-1 shows the network we’ll use for the examples in this chapter. R1 and R2 each have two Ethernet networks attached: one with an IP phone and one with a personal computer. The routers are connected with a T1 that terminates into S0/1 on each.

Figure 34-1. Simple converged network

Configuration

The interface we’ll be concentrating on is S0/1 on R1. Here is the configuration:

interface Serial0/1
 ip address 192.168.1.1 255.255.255.0
 service-policy output WAN

The service-policy statement maps the policy map named WAN to the interface. Here is the configuration for the policy map:

policy-map WAN
  class Voice-RTP
    priority 128
  class Voice-Control
   bandwidth percent 5
  class HTTP
   bandwidth percent 10
  class class-default
   fair-queue

The policy map references four classes: Voice-RTP, Voice-Control, HTTP, and the special class class-default. Remember that class-default is a special class name used when you’re building the default class. The default class is where packets not matching any other class are queued. The queues are designed as follows:

Voice-RTP

Packets in this class will be put into the strict priority queue. The queue will be sized for 128 Kbps. This is roughly the size ...