IP multicast Multilayer Switching (MLS)
IP multicast Multilayer Switching (MLS) Feature that provides high-performance, hardware-based, Layer 3 switching of IP multicast traffic for routers connected to Catalyst 5000 series LAN switches. An IP multicast flow is a unidirectional sequence of packets between a multicast source and the members of a destination multicast group. Flows are based on the IP address of the source device and the destination IP multicast group address. IP multicast MLS switches IP multicast data packet flows between IP subnets using advanced, application-specific integrated circuit (ASIC) switching hardware, thereby off-loading processor-intensive, multicast packet routing from network routers. The packet forwarding function is moved onto the connected Layer 3 switch whenever a supported path exists between a source and members of a multicast group. Packets that do not have a supported path to reach their destinations still are forwarded in software by routers. Protocol Independent Multicast (PIM) is used for route determination.
Source: ftp://espectrocrom.com/pub/manuales/cisco/pdfs/Cisco-Dictionary-Of-Internetworking-Terms-And-Acronyms.pdf
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