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 of two 64 Kbps ...