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Présentation : Port security is a layer two traffic control feature on Cisco Catalyst switches. It enables an administrator configure individual switch ports to allow only a specified number of source MAC addresses ingressing the port. Its primary use is to deter the addition by users of dumb switches to illegally extend the reach of the network e.g. so that two or three users can share a single access port . The addition of unmanaged devices complicates troubleshooting by administrators and is best avoided. Enabling Port Security ---------------------- Port security can be enabled with default parameters by issuing a single command on an interface Switch config interface f0 13 Switch config-if switchport port-security Although only a single interface is used for illustration in this article, port security, if configured, is typically configured on all user-facing interfaces. We can view the default port security configuration with show port-security Switch show port-security interface f0 13 Port Security Enabled Port Status Secure-down Violation Mode Shutdown Aging Time 0 mins Aging Type Absolute SecureStatic Address Aging Disabled Maximum MAC Addresses 1 Total MAC Addresses 0 Configured MAC Addresses 0 Sticky MAC Addresses 0 Last Source Address Vlan 0000.0000.0000 0 Security Violation Count 0 Continue reading
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