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Each switch is completely backward compatible with all of the layer 2 media modules that the switch currently supports. Layer 3 traffic is routed by sending that traffic to the supervisor module. The supervisor module routes all traffic from layer 2 media modules as described in the next section, "Routing with Layer 2 and Layer 3 Modules."
Note: Layer 2 traffic that does not require routing is bridged independently of the layer 3 traffic based on the MAC address or VLAN information.
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