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Quality of Service Every switch or router can offer some form of Quality of Service However, for the effective transport of voice and video the QoS performance must be quite rigorous Video and voice lose significant quality and become almost impossible to transport unless the network can guarantee tight controls on delay and delay variation Networks of Ethernet switched introduce queuing delay that makes accurate delivery of video and voice unpredictable Reliability A legacy of the voice network is a standard restoration time of < 50ms This evolved to ensure that a failure of a voice circuit could be correct in a time rapid enough to be undetectable to the human ear during a voice call Ethernet switching and routing have restoration mechanisms including Spanning Tree and Rapid Spanning tree that restore in under a minute for large networks, which is fine for many data applications but not within the tolerance required for voice and video However, when voice and video are transported on Ethernet networks it becomes a required characteristic of Carrier Ethernet Management Ethernet has historically used Simple Network Management Protocol (SNMP) Management Information Bases (MIB) to communicate Ethernet network fault information This protocol however, is insufficient for the detailed link-by-link and endto-end fault detection and management required on large nationwide networks that may involve multiple service providers The definition of new protocols and specifications to provide this type of visibility is important for Carrier Ethernet support Scalability Historically, carriers had to offer bandwidth in very coarse increments TDM jumps from 15 Mbps to 45 Mbps This discontinuity in bandwidth introduced inefficiency into the WAN data network that Carrier Ethernet is designed to overcome In addition, scalability implies a need to span large geographies and support millions of customers on the same network, all while potentially keeping each customer data separate All five of these characteristics indicate areas where definitions, specifications, standards, and new approaches are required to make Ethernet packets and Ethernet services efficient and effective on large public networks The IEEE 80217 working group created the RPR standard to address these service provider requirements RPR and Multiservice Support As mentioned in point C above and discussed in greater detail later in this chapter, RPR provides 4 classes of service It also contains a ring wide protocol that makes each switch aware of the state of every link on the ring The practical result of these two mechanisms is that delay and delay variation on the RPR become irrelevant even for voice and video applications Hence, RPR networks support any data or circuit application with whatever performance is required for the application RPR and Quality of Service These same mechanisms ensure quality of service (see Table 121) An RPR ring is deterministic The performance of services put on a ring is.

fnmerge( )

In this section, we re going to create a graphing user control. The control will have a place to enter names and values that will appear in a list and will automatically be graphed as they re entered (figure 14.8). Because of the nature of the graph, we ll be using mostly Rectangle shapes, but we could do line charts using lines or pie charts using ellipses and arcs. In theory, this control could be integrated into the Desktop Wiki application as an alternative type of data to store.

void fnmerge(char *path, const char *drive, const char *dir, const char *fname, const char *ext) int fnsplit(const char *path, char *drive, char *dir, char *fname, char *ext)

The prototypes for fnmerge( ) and fnsplit( ) are in <dirh> These functions are not defined by the ANSI/ISO C/C++ standard The fnmerge( ) function constructs a filename from the specified individual components and puts that name into the string pointed to by path For example, if drive is C:, dir is \CBuilder5\, fname is TEST, and ext is C, the filename produced is C:\CBuilder5\TESTC The fnsplit( ) decomposes the filename pointed to by path into its component parts The array size needed for each parameter is shown here, along with a macro defined in <dirh> that can be used in place of the actual number:

Resilient Packet Ring (RPR)

Figure 14.8 We re building the graphing control in a standalone application first. In the online version, we ve integrated this control into the Wiki application.

260 3 256 256 256

The fnsplit( ) function puts the colon after the drive specifier in the string pointed to by drive It puts the period preceding the extension into the string pointed to by ext Leading and trailing backslashes are retained The two functions fnmerge( ) and fnsplit( ) are complementary the output from one can be used as input to the other The fnsplit( ) function returns an integer than has five flags encoded into it The flags have these macro names associated with them (defined in <dirh>):

To get started, create a new WPF application, and add a user control called GraphHolder. This will hold the Add a value stuff on the left and a swappable control on the right that holds our various graphing displays. The next section will go into the implementation of the control.