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Figure 21-12 Selection is normally a mutually exclusive operation. When the need arises to discard mutual exclusivity in order to provide multiple selection, things can become confusing if some of the items can be scrolled out of sight. Earmarking is a solution to this. Put check boxes next to each text item and use them instead of selection to indicate the user s choices. Check boxes are a clearly non mutually exclusive idiom and a very familiar GUI idiom. Users grasp the workings of this idiom right away.

Figure 11.16: Customer equipment connects to the Provider Edge via a SAP. To the customer, the SAP in a VPLS behaves identically to a port on an Ethernet switch.

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List controls can be treated as palettes of goodies to use in a direct-manipulation idiom. If the list were part of a report-writing program, for example, you could click on an entry and drag it to the surface of the report to add a column representing that field. It s not selection in the usual sense, because it is a completely captive operation. Without a doubt, many programs would benefit if they made use of list controls that supported dragging and dropping. Such draggable items can help users gather items into a set. Providing two adjacent list controls, one showing available items and the other showing chosen items, is a common GUI idiom. One or sometimes a bidirectional pair of buttons placed between them allows items to be selected and transferred from one box to the other, as shown in Figure 21-13. It is so much more pleasant when the idiom is buttressed with the capability to just click and drag the desired item from one box to another without having to go through the intermediate steps of selection and function invocation.

Objective In this exercise, you will configure a VPLS service between PE routers. You will also demonstrate the ability of customer equipment to communicate across this VPLS as if it were a simple Ethernet switch.

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Figure 21 13 This dialog from Microsoft Outlook Express would benefit from the capability to drag a contact from the list at the left into the To, Cc, and Bcc lists at the right. Also notice the unfortunate use of horizontal scrollbars in all list fields. In the left-hand field, in particular, ToolTips could show the full row of information in the left-hand box. (Alternately, the dialog could be expanded. There s no practical reason to limit it to this size.)

Validation You will know you have succeeded if the CE devices can ping each other and if traceroute shows the CE devices as being only a single (virtual!) hop away from each other.

Sometimes the need arises to drag an item from a list control to another position in the same list control. (Actually, this need arises far more often than most interaction designers seem to think.) Many programs offer automatic sort facilities for important lists. Windows Explorer, for example, allows sorting files by name, by type, by modification date, and by size. That s nice, but wouldn t it be even better if users could order them by importance Algorithmically, the program could order them by frequency of user access, but that won t always get the right results. Adding in a factor of how recently files were accessed, as well, would get closer but still wouldn t be exactly right. (Microsoft does this with its font picker in some applications, and it works pretty well for this purpose.) Why not let users move what s important to them to a region at the top, and sort those things separately (in alphabetical or whatever order), in addition to sorting the full directory below For example, you might want to rearrange a list of the people in your department in descending order by where they sit. There is no automatic function that will do this;

1. Create a VPLS service. Every service is identified with a numeric name. The actual value isn t as important as the fact that it should be unique within the ISP s domain. Repeat the configuration on both PE1 and PE2, using an identical service number on both routers. Like SDPs, the default state for a service is disabled. Don t forget the no shutdown command!

*B:PE1# configure service *B:PE1>config>service# vpls 22 customer 1 create *B:PE1>config>service>vpls$ no shutdown *B:PE1>config>service>vpls$

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