LevelOne GSW-4876 User Manual
Page 113
C
HAPTER
4
| Configuring the Switch
Configuring Security
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◆
When enabled, traffic is filtered based upon dynamic entries learned via
DHCP snooping (see
), or static addresses
configured in the source guard binding table.
◆
If IP source guard is enabled, an inbound packet’s IP address will be
checked against the binding table. If no matching entry is found, the
packet will be dropped.
◆
Filtering rules are implemented as follows:
■
If DHCP snooping is disabled (see
), IP source guard will
check the VLAN ID, source IP address, and port number. If a
matching entry is found in the binding table and the entry type is
static IP source guard binding, the packet will be forwarded.
■
If DHCP snooping is enabled, IP source guard will check the VLAN
ID, source IP address, and port number. If a matching entry is
found in the binding table and the entry type is static IP source
guard binding, or dynamic DHCP snooping binding, the packet will
be forwarded.
■
If IP source guard if enabled on an interface for which IP source
bindings have not yet been configured (neither by static
configuration in the IP source guard binding table nor dynamically
learned from DHCP snooping), the switch will drop all IP traffic on
that port, except for DHCP packets.
P
ARAMETERS
These parameters are displayed:
Global Configuration
◆
Mode – Enables or disables IP Source Guard globally on the switch. All
configured ACEs will be lost when enabled. (Default: Disabled)
N
OTE
:
DHCP snooping must be enabled for dynamic clients to be learned
automatically.
◆
Translate dynamic to static – Click to translate all dynamic entries to
static entries.
Port Mode Configuration
◆
Port – Port identifier
◆
Mode – Enables or disables IP Source Guard on the specified ports.
Only when both Global Mode and Port Mode on a given port are
enabled, will ARP Inspection take effect on a given port.
(Default: Disabled)
◆
Max Dynamic Clients – Specifies the maximum number of dynamic
clients that can be learned on given ports. This value can be 0, 1, 2 or
unlimited. If the port mode is enabled and the maximum number of