Chapter 8
| General Security Measures
IP Source Guard
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show ip dhcp
snooping binding
This command shows the DHCP snooping binding table entries.
Command Mode
Privileged Exec
Example
Console#show ip dhcp snooping binding
MacAddress IpAddress Lease(sec) Type VLAN Interface
----------------- --------------- ---------- -------------------- ---- ------
11-22-33-44-55-66 192.168.0.99 0 Dynamic-DHCPSNP 1 Eth 1/5
Console#
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 269). 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 ethernet unit/port
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: 1-4094)
Table 55: 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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