Interlogix NS3550-2T-8S User Manual - Manual (Page 278)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
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4.12.7 Port Security Detail
This page shows the MAC addresses secured by the Port Security module. Port Security is a module with no direct configuration.
Configuration comes indirectly from other modules - the user modules. When a user module has enabled port security on a port,
the port is set-up for software-based learning. In this mode, frames from unknown MAC addresses are 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 appears.
Figure 4-12-7: Port Security Detail Screen Page Screenshot
The page includes the following fields:
Object Description
• MAC Address & VLAN
ID
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.
• State Indicates whether the corresponding MAC address is blocked or forwarding. In
the blocked state, it will not be allowed to transmit or receive traffic.
• Time of Addition Shows the date and time when this MAC address was first seen on the port.
• 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.
Buttons
Auto-refresh : Check this box to refresh the page automatically. Automatic refresh occurs every 3 seconds.
: Click to refresh the page immediately.
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 DHCP
Snooping Configuration screen in Figure 4-12-8 appears.