Multilayer Switching (MLS) combines Layer 2, Layer 3, and Layer 4 switching technologies to forward packets at wire speed using hardware. Cisco supports MLS for both Unicast and Multicast traffic flows. In Unicast transmission, a flow is a unidirectional sequence of packets between a source and destination pair that shares the same protocol and Transport Layer information. These flows are based only on Layer 3 address information. In Multicast transmission, a flow is a unidirectional sequence of packets between a Multicast source and the members of a destination Multicast group. Multicast flows are based on the IP address of the . . .
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