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In the Web world, the most common form of overview area is textual: the ubiquitous breadcrumb display (see Figure 11-9). Again, most breadcrumbs provide not only a navigational aid, but a navigational control as well: They not only show where in the data structure a visitor is, but they give him tools to move to different nodes in the structure in the form of links. This idiom has lost some popularity as Web sites have moved away from strictly hierarchical organizations to more associative organizations, which don t lend themselves as neatly to breadcrumbs.

There are some additional factors to consider for VLANs when they are examined from the perspective of a service provider. A restriction of Ethernet VLANs is the limited number of VIDs. With 12 bits used to define the VID, there are only 212 = 4,096 possibilities. Because VLANs 0 and 4095 are reserved, a Provider Edge (PE) router (connection to the customer) is really only capable of supporting 4,094 VLANs not a significant number if it is compared with the expanding rates of networks. While 4,094 might seem sufficient, a single PE router might support hundreds or even thousands of customers, and the number of available VIDs can quickly evaporate.

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Figure 11-9 A typical breadcrumb display from Amazon.com. Users see where they ve been and can click anywhere in the breadcrumb trail to navigate to that link.

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One of the solutions to this restriction is VLAN stacking, also known as Q-in-Q. VLAN stacking allows the service provider to use Layer 2 protocols to connect customer sites. In Figure 4.20, three customers are connected through a common switch using VLAN stacking.

Figure 4.20 Service providers can stack VLAN ID information in order to support multiple customers with overlapping VLANs over the same provider backbone.

A final interesting example of an overview tool is the annotated scrollbar. Annotated scrollbars are most useful for scrolling through text. They make clever use of the linear nature of both scrollbars and textual information to provide location information about the locations of selections, highlights, and potentially many other attributes of formatted or unformatted text. Hints about the locations of these items appear in the track that the thumb of the scrollbar moves in, at the appropriate location. When the thumb is over the annotation, the annotated feature of the text is visible in the display (see Figure 11-10). Microsoft Word uses a variant of the annotated scrollbar; it shows the page number and nearest header in a ToolTip that remains active during the scroll.

Customer 1 VLAN 10-300 10-300 data CE Customer 2 VLAN 10-300 10-300 data CE Customer 3 VLAN 10-300 10-300 data CE Customer 1 VLAN 20 Customer 2 VLAN 200 Customer 3 VLAN 35 Customer 3 VLAN 10-300 10-300 data CE Customer 1 VLAN 10-300 10-300 data CE Customer 2 VLAN 10-300 10-300 data CE

Figure 11-10 An annotated scrollbar from Microsoft Word 2007 provides useful context to a user as he navigates through a document.

/ / If the node that sent this message is also selected / / for visualization, update its log in 'real time' if (Integer.parseInt((String) i d L i s t . g e t S e l e c t e d I t e m 0 ) magorigin)

At the PE, the administrator has assigned a VLAN to represent the customer on that port. When the customer traffic arrives at the PE device, the PE switch simply inserts another VLAN tag in the frame in front of the first VLAN tag. It is this second or stacked VLAN tag that takes the customer traffic through the provider network. At the egress port of the PE equipment, the second or stack VLAN tag is removed, and the traffic is forwarded out the port. This VLAN stacking allows Customers 1, 2, and 3 to use the same VLAN tags in their network. In theory, the service provider can support 4,094 customers, with each customer supporting 4,094 VLANs within their own network. Let s examine how this magic is accomplished by taking a look at the frames that support it. In Figure 4.21, Customer 1 has sent a frame to the PE switch with a VLAN tag of 100. The PE switch inserts a second VLAN tag of 20. This tag number represents Customer

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