nexus switch no mac address learning on vlan

#Nexus switch no mac address learning on vlan mac#

The switch forwards the ARP request out all ports except the port the host A is connected to.

#Nexus switch no mac address learning on vlan mac#

Host A uses the ARP process to find out the MAC address of host B. Host A knows the IP address of host B, but since this is the first time the two hosts communicate, the hardware (MAC) addresses are not known. Let’s say that host A wants to communicate with host B for the first time. To better how a network switch works, take a look at the following example: loop avoidance – switches use Spanning Tree Protocol (STP) to prevent network loops while still permitting redundancy.forward/filter decisions – switches decide whether to forward or filter a frame, based on the destination MAC address.address learning – switches learn MAC addresses by examining the source MAC address of each received frame.Switches usually perform these three functions in a LAN:

This table is stored in the volatile memory, so associations are erased after the switch is rebooted. The table that stores such associations is called a MAC address table. When a switch receives a frame, it associates the media access control (MAC) address of the sending device with the port on which it was received.

Switches also use MAC addresses to make accurate forwarding or filtering decision. Devices that want to communicate need to know each other MAC addresses before sending out packets. This address is used in LANs for communication between devices on the same network segment. Each network card has a unique identifier called a Media Access Control (MAC) address.