 make sure the new software revision is loaded: Switch# sho mod Mod Ports Card Type Model Serial No. CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX SAL09858F2K 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX SAL09322F2K 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAL0935896A 0 Supervisor-Other Unknown Unknown 6 Firewall Module WS-SVC-FWM-1 SAD092803DF 0 CSM with SSL WS-X6066-SLB-S-K9 SAD094107YN 8 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX SAL09881F2K Chapter 28: Content Switch Modules in Action Mod MAC addresses Status 0015.2bca.1df4 to 0015.2bca.1e23 12.2(14r)S5 12.2(17d)SXB Ok 0014.a90c.6ce0 to 0014.a90c.6ce7 7.2(1) 3.4(1a) 0014.a97d.b5d4 to 0014.a97d.b5d7 8.1(3) 12.2(17d) SXB Ok (0000.0000.0000 to 0000.0000.0000 Unknown Unknown Unknown 0014.a90c.3a58 to 0014.a90c.3a5f 7.2(1) 2.3(2) 0015.636e.9ea2 to 0015.636e.9ea9 2.1(1) 0014.a9bc.f8b8 to 0014.a9bc.f8bf 7.2(1) 4.1(4)S91 Upgrading the CSM PART VII Quality of Service Quality of Service (QoS), with an emphasis on low-latency queuing (LLQ), is the focus of this section. The first chapter explains QoS, and the second walks you though the steps necessary to deploy LLQ on a WAN link. Finally, I'll show you how congested and converged networks behave, and how LLQ can be tuned. This section is composed of the following chapters: Chapter 29, Introduction to QoS Chapter 30, Designing a QoS Scheme Chapter 31, The Congested Network Chapter 32, The Converged Network CHAPTER 29 Introduction to QoS Quality of Service (QoS) is deployed to prevent data from saturating a link to the point that other data cannot gain access to it. Remember, WAN links are serial links, which means that bits go in one end, and come out the other end, in the same order: regardless of whether the link is a 1.5 Mbps T1 or a 45 Mbps DS3, the bits go in one at a time, and they come out one at a time. QoS allows certain types of traffic to be given a higher priority than other traffic. Once traffic is classified, traffic with the highest priority can be sent first, while lower-