Ticket 7 – Port Security

Client 1 is unable to ping Client 2 as well as DSW1. The command ‘sh interfaces fa1/0/1′ will show following message in the first line
‘FastEthernet1/0/1 is down, line protocol is down (err-disabled)’

On ASW1 port-security mac 0000.0000.0001, interface in err-disable state

Configuration of ASW1
interface fa1/0/1
 switchport access vlan 10
 switchport mode access
 switchport port-security
 switchport port-security mac-address 0000.0000.0001

Answer: on ASW1 delele port-security & do on interfaces shutdown, no shutdown

Ans1) ASW1
Ans2) Port security
Ans3) In Configuration mode, using the interface range Fa1/0/1 – 2, then no switchport port-security, followed by shutdown, no shutdown interface configuration commands.

Note: There is another ticket (ticket 13) in which port security is also configured but it is not the fault. In that ticket when we “show interfaces fa1/0/1” we see the interface is in ‘up/up’ state so be careful to identify the two tickets.