Chapter 22: WAN Configuration Guide320 SmartSwitch Router User Reference ManualThe following command line displays an example for PPP:Packet EncryptionPacket encryption allows data to travel through unsecured networks. You can enablepacket encryption for PPP ports, however, both ends of a link must be configured to usepacket encryption.The following command line displays an example:WAN Quality of ServiceIncreasing concentrations of audio, video, and data traffic are now presenting thenetworking industry with the significant challenge of employing the most effective use ofWAN Quality-of-Service (QoS) as possible to ensure reliable end-to-end communication.For example, critical and time-sensitive traffic such as audio should have higher levels ofbandwidth allocated than less time-sensitive traffic such as file transfers or e-mail. Simplyadding more and more bandwidth to a network is not a viable solution to the problem.WAN access is extremely expensive, and there is a limited (albeit huge) supply. Therefore,making the most effective use of existing bandwidth is now a more critical issue than everbefore.The fact that IP communications to the desktop are clearly the most prevalent used todayhas made it the protocol of choice for end-to-end audio, video, and data applications. Thismeans that the challenge for network administrators and developers has been to constructtheir networks to support these IP-based audio, video, and data applications along withtheir tried-and-true circuit-based applications over a WAN.In addition, these audio, video, and data traffic transmissions hardly ever flow at a steadyrate. Some periods will see relatively low levels of traffic, and others will temporarilysurpass a firm’s contracted Committed Information Rate (CIR). Carrier-based packet-switched networks such as Frame Relay and ATM are designed to handle these temporarypeaks in traffic, but it is more cost- and resource- efficient to employ effective QoSconfiguration(s), thus relaxing the potential need to up your firm’s CIR. By applying someof the following sorts of attributes to interfaces on your network, you can begin to shapeyour network’s QoS configuration to use existing bandwidth more effectively.ppp set payload-compress port se.4.2ppp set payload-encrypt transmit-key 0x123456789abcdef receive-key0xfedcba987654321 port se.4.2, mp.1
