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The second page of the wizard asks for the developer to choose a data source, and then the report is created Once the report has been generated, the design surface opens in the Design tab in the main work area In the Details pane is a list of all measures, dimensions, and named sets Developers can simply drag and drop items from the Details pane and then drop them into the three panels at the bottom of the Design tab, which includes Series, Bottom Axis, and Background With most typical charts, the bottom axis will represent time and the series will contain one or more measures Figure 5-26 shows an example of an Analytic Chart showing the order quantity for eight quarters The Order Quantity measure has been placed in the Series panel The DateCalendar hierarchy has been added to the Bottom Axis panel After adding the hierarchy, the members have to be selected by the designer Otherwise only the default member is chosen, which is usually the All member In order to choose the individual members, developers can right-click on the dimension in the Bottom Axis panel and choose Select Members or click the drop-down indicator to the right of the hierarchy Either will open up a dialog box which lets the developer expand the

You have seen how much fun it is building routing tables by hand Imagine doing this for 1,000 routers What happens if there is a failure in the network We would have to figure it out and send out new tables For this reason, networks use dynamic routing, whereby they learn who their neighbors are and build their own routing table from that information Two basic methods for doing this are used in the Internet Routing Information Protocol (RIP) was the original mechanism for sending routing table updates Its operation is very simple Each router packs up its routing table into packets and sends these packets to all of its neighbors The neighboring routers then pick through the received table to look for better routes to destination networks than it already has If it finds better routes, it puts them in its table The process repeats itself Clearly, if we do this once per day, then old or invalid routes will remain in the table for at least a day The more dynamic we want our network to be, the more often we should do the update Unfortunately, this consumes lots of network bandwidth when done too often Every half a minute (30 seconds) to a few minutes seems to be a reasonable range The irony here is that larger networks have a greater probability of something changing so they have to do it more often than smaller networks There are a couple of problems with RIP when the network gets big The tables grow exponentially, and therefore it takes more and more router processing power to handle the table updates The second problem is that good news travels fast, but bad news (unavailability of routes) travels slowly RIP works fine in small networks To handle the problem of exponentially growing routing tables, we break the network into routing domains These are called autonomous systems The basic idea is that all the routers within a routing domain or autonomous system can exchange routing tables as usual All routes to locations outside their domain are sent to the boundary router (frequently called a gateway router or simply gateway) The boundary router is also part of the local domain, and is part of the exterior domain It uses a different protocol to exchange routing tables with its peers called Boundary Gateway Protocol (BGP) This keeps the volume of traffic between routing areas or autonomous systems manageable Figure 29-14 depicts these routing domains The Internet terminology (using gateway for router) is shown on the top of each figure, while the ISO standard terminology is placed below each figure.

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