Cisco Psecure Violation Error Detected
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Catalyst 3750 Series SwitchesConfigureConfiguration Examples and TechNotes Layer 2 Security Features on Cisco Catalyst Layer 3 Fixed err-disabled bpduguard Configuration Switches Configuration Example Download Print Available Languages Download Options PDF errdisable recovery interval best practice (32.8 KB) View with Adobe Reader on a variety of devices Updated:Jan 17, 2007 Contents Introduction port status secure-down Prerequisites Requirements Components Used Related Products Conventions Background Information Configure Network Diagram Port Security DHCP Snooping Dynamic ARP Inspection IP Source Guard Verify Troubleshoot Related Information Introduction https://learningnetwork.cisco.com/thread/40632 This document provides a sample configuration for some of the Layer 2 security features, such as port security, DHCP snooping, dynamic Address Resolution Protocol (ARP) inspection and IP source guard, that can be implemented on Cisco Catalyst Layer 3 fixed configuration switches. Prerequisites Requirements There are no specific requirements for this document. Components Used The http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/72846-layer2-secftrs-catl3fixed.html information in this document is based on the Cisco Catalyst 3750 Series Switch with version 12.2(25)SEC2. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command. Related Products This configuration can also be used with these hardwares: Cisco Catalyst 3550 Series Switches Cisco Catalyst 3560 Series Switches Cisco Catalyst 3560-E Series Switches Cisco Catalyst 3750-E Series Switches Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Background Information Similar to routers, both Layer 2 and Layer 3 switches have their own sets of network security requirements. Switches are susceptible to many of the same Layer 3 attacks as routers. However, switches and Layer 2 of the OSI reference model in general, are subject to network attacks in different ways. These include: Cont
| View Threaded m4rtntns at gmail Oct31,2014,7:27AM Post #1 of 3 (2366 views) Permalink Under which conditions does port-security consider MAC flap as a security violation? Hi, I have a following very simple setup: http://s30.postimg.org/d0t320dsh/port_sec.png As seen above, PC with two NIC's is connected to Cisco Catalyst WS-C4506 switch and both NIC's on PC have the same MAC address 00:00:00:00:00:11. Switch port configuration is identical: interface GigabitEthernet6/41 switchport access vlan 881 switchport mode access switchport port-security maximum 100 switchport port-security switchport port-security aging time 10 switchport port-security aging type inactivity end interface GigabitEthernet6/42 switchport access vlan 881 switchport mode access switchport port-security maximum 100 switchport port-security switchport port-security aging time 10 switchport port-security aging type inactivity end As seen above, port-security on switch ports is enabled. If I send an unicast frame from PC port eth0 to switch port Gi6/42, then the switch will learn the MAC address in its MAC address table and "Total MAC Addresses" counter in "sh port-security interface Gi6/42" output will increase from 0 to 1. Now when I send unicast frame from PC port eth1 to switch port Gi6/41, then the switch will not learn the MAC address and "Total MAC Addresses" counter in "sh port-security interface Gi6/41" output will stay 0. In addition, "Last Source Address:Vlan" field stays "0000.0000.0000:0". IMHO this is all expected behavior and this is how the port-security with configuration above should work. However, on a live switch with the very same configuration and HW/SF(WS-X4515 SUP with cat4500-ipbasek9-mz.122-54.SG.bin) as the lab one, I saw a behavior where duplicate MAC address on two por