In the case of a WAN aggregation router supporting over 100 Mbps of WAN circuits, as in the case of a WAG running one or more OC-3 ports (at 155 Mbps each), multiple Fast Ethernet connections can be used to connect to the WAG from the distribution-layer switch to achieve the same net effect.
The point is to bring back, as much as possible, the choke point into network reporting and engage hardware queuing there instead of overwhelming the software-based policing and queuing policies within the WAN aggregation router.
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