Second, if the combined WAN circuit rate is significantly below 100 Mbps, enable egress shaping on the Catalyst switches (when supported).
If there is no hope of engaging queuing on the network procedures because the combined WAN circuit rates are far below those of Fast Ethernet, enable shaping on platforms that support this feature.
For example, if a branch router is using two ATM-IMA T1 links (3 Mbps combined throughput) to connect the branch to the WAN, the branch switch could be configured to shape all WAN-destined traffic to 3 Mbps or could be configured to shape on a per-application basis to smaller increments
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