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Methodologies for selecting the grooming nodes, and strategies for delivering traffic to these sites from the non-grooming nodes, are discussed in Sects. 6.5 and 6.6, respectively.
This section examines how a grooming node should be architected, taking into ac- count cost and scalability issues.
The nodes without a grooming switch typically must backhaul their sub- rate traffic to nearby grooming nodes.
The total subrate traffic tentatively routed on the links incident on a node can then be used as one of the metrics to assist in determining the set of grooming nodes.
For example, a possible goal for an optical-bypass-enabled network design may be to select the grooming nodes such that the non-grooming nodes are able to backhaul their traffic without requiring any regeneration along the backhaul path.
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