How do I troubleshoot a layer 2 issue?
1) Eliminate Layer 1 issue using “show ip interface “command. 2) Verify VLAN exist on the Switch using “Show VLAN “command. 3) Verify that the interface is assigned to the correct VLAN using “show interface switchport” command. 4) Verify that VLAN is allowed on trunk port using “show interface trunk” command.
Do switches drop frames?
A switch will never send a frame back out the same port it came in on, so in this rare instance, the switch will filter (drop) the frame. Let’s review those frame forwarding decisions: Forwarding happens when the switch has an entry for the frame’s destination in its MAC address table.
What happens to an incoming frame on a layer 2 switch?
As a frame is received on a switch port, the switch inspects the source MAC address. Incoming frames also include the destination MAC address. Again, the switch looks this address up in the address table, hoping to find the switch port and VLAN where the address is attached.
What does layer 2 switch mean?
A layer 2 switch is a type of network switch or device that works on the data link layer (OSI Layer 2) and utilizes MAC Address to determine the path through where the frames are to be forwarded. It uses hardware based switching techniques to connect and transmit data in a local area network (LAN).
Under which circumstance will a switch drop a frame?
Explanation:A switch will flood a frame out of every port, except the one that the frame was received from, under two circumstances. Either the frame has the broadcast address as the destination address, or the destination address is unknown to the switch.
What happens when a switch receives a frame?
The switch notifies the source of the bad frame. The switch drops the frame. The switch floods the frame to all ports except the port through which the frame arrived to notify the hosts of the error.