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What is L2 port and L3 port?
Commonly known as L2 device (L2 = Ethernet). L3 Switch: Performs (1) IP forwarding (delivering packets based on destination IP address) or (2) Ethernet switching (delivering based on destination MAC address) according to the destination MAC address of a received packet. It has only one type of port, Ethernet.
What is Layer 3 in Cisco?
The Catalyst 4500 series switch supports Layer 3 interfaces with the Cisco IOS IP and IP routing protocols. Layer 3, the network layer, is primarily responsible for the routing of data in packets across logical internetwork paths.
What is Layer 3 LAN port?
Simply put, a layer 3 switch combines the functionality of a switch and a router. It acts as a switch to connect devices that are on the same subnet or virtual LAN at lightning speeds and has IP routing intelligence built into it to double up as a router.
What is the difference between the L3 switch and router?
Hardware/Software decision making – The key difference between Layer 3 switch and router lies in the hardware technology used to making forwarding decision. Layer 3 switch uses ASICs for forwarding decisions. Conversely, the router makes forwarding decisions based on hierarchical Layer-3 addresses.
How does MLS work in a Cisco router?
MLS enables hardware-based Layer 3 switching to offload routers from forwarding unicast IP data packets over shared media networking technologies such as Ethernet. The packet forwarding function is moved onto Layer 3 Cisco series switches whenever a partial or complete switched path exists between two hosts.
Where does the mls-SE get layer 3 flow information?
The MLS-SE learns the Layer 3 flow information (such as the destination address, source address, and protocol port numbers), and forwards the first packet to the MLS-RP. A partial MLS entry for this Layer 3 flow is created in the MLS cache.
How does the MLS-RP forward the packet?
The MLS-RP receives the packet, looks at its route table to determine how to forward the packet, and applies services such as Access Control Lists (ACLs) and class of service (CoS) policy. The MLS-RP rewrites the MAC header adding a new destination MAC address (Host B’s) and its own MAC address as the source.
Do you need a Cisco switch for L2 tunneling?
Support for L2 protocol tunneling (Cisco Discovery Protocol, Spanning Tree Protocol, VLAN Trunking Protocol, and Link Layer Discovery Protocol) requires that the device is a switch. This switch needs to be L3 aware in order to be able to tunnel traffic and limit the possible choices.