User’s Manual of GS-5220 LCD Series
440
• Age/Hold
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.
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.
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