http://www.ciscoclub.in.th/index.php?topic=715
http://en.wikipedia.org/wiki/EtherType
http://www.gotoknow.org/blogs/posts/306789
http://running-config.blogspot.com/2011/01/port-security-cisco-catalyst-switch.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/port_sec.html
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htnmsylg.html
http://www.howtonetwork.net/public/659.cfm
http://www.compspot.net/index.php?option=com_content&task=view&id=351
http://www.orbit-computer-solutions.com/How-the-Root-Bridge-and-Ports-are-chosen.php
<br>http://www.cisco.com/en/US/docs/ios-xml/ios/config-mgmt/configuration/xe-3s/Managing_Configuration_Files_Configuration_Guide_Cisco_IOS_XE_Release_3S.html
interface e0
ip address 192.168.1.1 255.255.255.0
ip nat outside
!
interface e1
ip address 10.1.1.1 255.255.255.0
ip nat inside
!
ip nat inside source static 10.1.1.2 192.168.1.2
interface Ethernet0
ip address 192.168.3.1 255.255.255.0
ip nat inside
!
interface Ethernet1
ip address 192.168.4.1 255.255.255.0
ip nat inside
!
interface Serial0
ip address 172.17.38.1 255.255.255.0
ip nat outside
!
ip nat inside source list 1 interface Serial0 overload
!
access-list 1 permit 192.168.3.0 0.0.0.255
access-list 1 permit 192.168.4.0 0.0.0.255
RouterX# show ip nat translations
Pro Inside global Inside local Outside local Outside global
TCP 172.17.38.1:1050 192.168.3.7:1050 10.1.1.1:23 10.1.1.1:23
TCP 172.17.38.1:1776 192.168.4.12:1776 10.2.2.2:25 10.2.2.2:25
SW1#show port-security interface fa0/1
Port Security : Enabled
Port Status : Secure-up
Violation Mode : Shutdown
Aging Time : 0 mins
Aging Type : Absolute
SecureStatic Address Aging : Disabled
Maximum MAC Addresses : 10
Total MAC Addresses : 1
Configured MAC Addresses : 0
Sticky MAC Addresses : 0
Last Source Address:Vlan : 1110.353f.c091:2
Security Violation Count : 0
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