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On a 50-series layer 3 module, each fabric port has two Forwarding Engines, one for layer 3 traffic, and one for layer 2 traffic. All layer 3 traffic will be associated with one Forwarding Engine and all the layer 2 traffic will be associated with the other Forwarding Engine.
Example, the twelve-port 10/100 layer 3 50-series media module, layer 3 traffic is coming in the first port and the last port, (ports 1,12). Using the 80-series even distribution, the first six ports are associated with one FE and the second six ports with the second FE, and distributed across both fabric ports.
This is different for the 50-series modules. The twelve port layer 3 50-series media module, all twelve ports are associated with one Forwarding Engine for layer 3 traffic and one Forwarding Engine for layer 2 traffic. In addition only one fabric port is used for all twelve ports.
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