C
HAPTER
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| General Security Measures
IP Source Guard
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IP SOURCE GUARD
IP Source Guard is a security feature that filters IP traffic on network
interfaces based on manually configured entries in the IP Source Guard
table, or dynamic entries in the DHCP Snooping table when enabled (see
"DHCP Snooping" on page 724). IP source guard can be used to prevent
traffic attacks caused when a host tries to use the IP address of a neighbor
to access the network. This section describes commands used to configure
IP Source Guard.
ip source-guard
binding
This command adds a static address to the source-guard binding table. Use
the no form to remove a static entry.
SYNTAX
ip source-guard binding mac-address vlan vlan-id ip-address
interface
no ip source-guard binding mac-address vlan vlan-id
mac-address - A valid unicast MAC address.
vlan-id - ID of a configured VLAN (Range: 1-4093)
ip-address - A valid unicast IP address, including classful types A, B
or C.
interface - Specifies a port interface.
ethernet unit/port
unit - This is unit 1.
port - Port number. (Range: 1-24)
DEFAULT SETTING
No configured entries
Table 71: IP Source Guard Commands
Command Function Mode
ip source-guard binding Adds a static address to the source-guard binding
table
GC
ip source-guard Configures the switch to filter inbound traffic based
on source IP address, or source IP address and
corresponding MAC address
IC
ip source-guard max-
binding
Sets the maximum number of entries that can be
bound to an interface
IC
show ip source-guard Shows whether source guard is enabled or
disabled on each interface
PE
show ip source-guard
binding
Shows the source guard binding table PE
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