Chapter 8
| General Security Measures
IP Source Guard
– 283 –
sip-mac option). 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.
â–
If the DHCP snooping is enabled, IP source guard will check the VLAN ID,
source IP address, port number, and source MAC address (for the sip-mac
option). 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.
â–
If IP source guard if enabled on an interface for which IP source bindings
(dynamically learned via DHCP snooping or manually configured) are not
yet configured, the switch will drop all IP traffic on that port, except for
DHCP packets.
â–
Only unicast addresses are accepted for static bindings.
Example
This example enables IP source guard on port 5.
Console(config)#interface ethernet 1/5
Console(config-if)#ip source-guard sip
Console(config-if)#
Related Commands
ip source-guard binding (280)
ip dhcp snooping (270)
ip dhcp snooping vlan (275)
ip source-guard
max-binding
This command sets the maximum number of entries that can be bound to an
interface. Use the no form to restore the default setting.
Syntax
ip source-guard max-binding number
no ip source-guard max-binding
number - The maximum number of IP addresses that can be mapped to an
interface in the binding table. (Range: 1-5)
Default Setting
5
Command Mode
Interface Configuration (Ethernet)
Command Usage
â—† This command sets the maximum number of address entries that can be
mapped to an interface in the binding table, including both dynamic entries
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