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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
471
DHCP Snooping* Filters untrusted DHCP messages on unsecure ports by buildingand
maintaining a DHCP snooping binding table
IP Source Guard* Filters IP traffic on unsecure ports for which the source address cannot be
identified via DHCP snooping nor static source bindings
* The priority of execution for these filtering commands is Port Security, Port Authentication, Network Access, Web
Authentication, Access Control Lists, DHCP Snooping, and then IP Source Guard.
5.13.1 Port Security Commands
These commands can be used to enable port security on a port. When using port security, the switch stops learning new MAC
addresses on the specified port when it has reached a configured maximum number. Only incoming traffic with source
addresses already stored in the dynamic or static address table for this port will be authorized to access the network. The port
will drop any incoming frames with a source MAC address that is unknown or has been previously learned from another port. If a
device with an unauthorized MAC address attempts to use the switch port, the intrusion will be detected and the switch can
automatically take action by disabling the port and sending a trap message.
Command Function Mode
port security Configures a secure port IC
mac-address-table static Maps a static address to a port in a VLAN GC
show mac-address-table Displays entries in the bridge-forwarding database PE
Table 5-41 Port Security Commands
port security
This command enables or configures port security. Use the no form without any keywords to disable port security. Use the no
form with the appropriate keyword to restore the default settings for a response to security violation or for the maximum number
of allowed addresses.
Syntax
port security [action {shutdown | trap | trap-and-shutdown} | max-mac-count address-count] no port security [action |
max-mac-count] action -Response to take when port security is violated. -shutdown - Disable port only. -trap - Issue
SNMP trap message only. -trap-and-shutdown - Issue SNMP trap message and disable port. max-mac-count
-address-count - The maximum number of MAC addresses that can be learned on a port. (Range: 0-1024)
Default Setting
Status: Disabled
Action: None
Maximum Addresses: 0
Command Mode