Dhcp Snooping - Planet XGSW-28040 User Manual

passed on to the port security module, which in turn asks all user modules whether to allow this new MAC address to forward or
block it. For a MAC address to be set in the forwarding state, all enabled user modules must unanimously agree on allowing the
MAC address to forward. If only one chooses to block it, it will be blocked until that user module decides otherwise. The Port
Security Detail screen in Figure 4-12-7
The page includes the following fields:
Object
 MAC Address & VLAN
ID
 State
 Time of Adding
 Age/Hold
Buttons
: Click to refresh the page immediately.
Auto-refresh : Check this box to refresh the page automatically. Automatic refresh occurs every 3 seconds.

4.12.8 DHCP Snooping

DHCP Snooping is used to block intruder on the untrusted ports of DUT when it tries to intervene by injecting a bogus DHCP
reply packet to a legitimate conversation between the DHCP client and server. Configure DHCP Snooping on this page. The
appears.
Figure 4-12-7 Port Security Detail screen page screenshot
Description
The MAC address and VLAN ID that is seen on this port. If no MAC addresses
are learned, a single row stating "No MAC addresses attached" is displayed.
Indicates whether the corresponding MAC address is blocked or forwarding. In
the blocked state, it will not be allowed to transmit or receive traffic.
Shows the date and time when this MAC address was first seen on the port.
If at least one user module has decided to block this MAC address, it will stay in
the blocked state until the hold time (measured in seconds) expires. If all user
modules have decided to allow this MAC address to forward, and aging is
enabled, the Port Security module will periodically check that this MAC address
still forwards traffic. If the age period (measured in seconds) expires and no
frames have been seen, the MAC address will be removed from the MAC table.
Otherwise a new age period will begin.
If aging is disabled or a user module has decided to hold the MAC address
indefinitely, a dash (-) will be shown.
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User's Manual of XGSW-28040