Laboratorio 2.2.4.9 Packet Tracer - Configuring Switch Port
Security
Topology
Addressing Table
Device Interface IP Address Subnet Mask
S1 VLAN 1 10.10.10.2 255.255.255.0 PC1 NIC 10.10.10.10 255.255.255.0 PC2 NIC 10.10.10.11 255.255.255.0 Rogue Laptop NIC 10.10.10.12 255.255.255.0
Objective
Part 1: Configure Port Security Part 2: Verify Port Security
Background
In this activity, you will configure and verify port security on a switch. Port security allows you to restrict a port’s ingress traffic by limiting the MAC addresses that are allowed to send traffic into the port.
Part 1:
Configure Port Security
a. Access the command line for S1 and enable port security on Fast Ethernet ports 0/1 and 0/2.
S1(config)# interface range fa0/1 - 2
S1(config-if-range)# switchport port-security
b. Set the maximum so that only one device can access the Fast Ethernet ports 0/1 and 0/2. S1(config-if-range)# switchport port-security maximum 1
c. Secure the ports so that the MAC address of a device is dynamically learned and added to the running configuration.
S1(config-if-range)# switchport port-security mac-address sticky
d. Set the violation so that the Fast Ethernet ports 0/1 and 0/2 are not disabled when a violation occurs, but packets are dropped from an unknown source.
S1(config-if-range)# switchport port-security violation restrict
e. Disable all the remaining unused ports. Hint: Use the range keyword to apply this configuration to all the ports simultaneously.
S1(config-if-range)# interface range fa0/3 - 24 , gi1/1 - 2 S1(config-if-range)# shutdown
Part 2: Verify Port Security
a. From PC1, ping PC2.
b. Verify port security is enabled and the MAC addresses of PC1 and PC2 were added to the running configuration.
c. Attach Rogue Laptop to any unused switch port and notice that the link lights are red.
d. Enable the port and verify that Rogue Laptop can ping PC1 and PC2. After verification, shut down the port connected to Rogue Laptop.
e. Disconnect PC2 and connect Rogue Laptop to PC2’s port. Verify that Rogue Laptop is unable to ping
PC1.
f. Display the port security violations for the port Rogue Laptop is connected to. S1# show port-security interface fa0/2
g. Disconnect Rouge Laptop and reconnect PC2. Verify PC2 can ping PC1.
h. Why is PC2 able to ping PC1, but the Rouge Laptop is not? The port security that was enabled on the port only allowed the device, whose MAC was learned first, access to the port while preventing all other devices access.
Current configuration : 1675 bytes !
version 12.2
no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname S1 ! ! ! ! ! spanning-tree mode pvst ! interface FastEthernet0/1 switchport mode access switchport port-security
switchport port-security mac-address sticky switchport port-security violation restrict
!
interface FastEthernet0/2 switchport mode access switchport port-security
switchport port-security mac-address sticky switchport port-security violation restrict
switchport port-security mac-address sticky 0001.647C.697E ! interface FastEthernet0/3 shutdown ! interface FastEthernet0/4 shutdown ! interface FastEthernet0/5 shutdown ! interface FastEthernet0/6 shutdown ! interface FastEthernet0/7 shutdown ! interface FastEthernet0/8 shutdown ! interface FastEthernet0/9 shutdown ! interface FastEthernet0/10 shutdown ! interface FastEthernet0/11 shutdown ! interface FastEthernet0/12 shutdown ! interface FastEthernet0/13 shutdown ! interface FastEthernet0/14 shutdown ! interface FastEthernet0/15 shutdown ! interface FastEthernet0/16 shutdown ! interface FastEthernet0/17 shutdown ! interface FastEthernet0/18 shutdown ! interface FastEthernet0/19 shutdown ! interface FastEthernet0/20 shutdown ! interface FastEthernet0/21
shutdown ! interface FastEthernet0/22 shutdown ! interface FastEthernet0/23 shutdown ! interface FastEthernet0/24 shutdown ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 ip address 10.10.10.2 255.255.255.0 ! ! ! ! line con 0 ! line vty 0 4 login line vty 5 15 login ! ! end S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1# S1#conf t
Enter configuration commands, one per line. End with CNTL/Z. S1(config)#int f0/3
S1(config-if)#no shut S1(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/3, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to up %LINK-5-CHANGED: Interface FastEthernet0/3, changed state to down
%LINK-5-CHANGED: Interface FastEthernet0/2, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down %LINK-5-CHANGED: Interface FastEthernet0/2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up S1(config-if)#exit
S1(config)#exit S1#
%SYS-5-CONFIG_I: Configured from console by console S1#show port-security int f0/2
Port Security : Enabled Port Status : Secure-up Violation Mode : Restrict Aging Time : 0 mins Aging Type : Absolute
SecureStatic Address Aging : Disabled Maximum MAC Addresses : 1 Total MAC Addresses : 1 Configured MAC Addresses : 0 Sticky MAC Addresses : 1
Last Source Address:Vlan : 0002.4A42.C51C:1 Security Violation Count : 4
S1#
%LINK-5-CHANGED: Interface FastEthernet0/2, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to down %LINK-5-CHANGED: Interface FastEthernet0/2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/2, changed state to up S1#int f0/3
^
% Invalid input detected at '^' marker. S1#conf t
Enter configuration commands, one per line. End with CNTL/Z. S1(config)#int f0/3
S1(config-if)#shut
%LINK-5-CHANGED: Interface FastEthernet0/3, changed state to administratively down S1(config-if)#int range g0/1 - 2
S1(config-if-range)#shut
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to administratively down %LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to administratively down
