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IP SOURCE GUARD CONFIGURATION
When configuring IP Source Guard, go to these sections for information you are
interested in:
■ “IP Source Guard Overview” on page 177
■ “Configuring a Static Binding Entry” on page 177
■ “Configuring Dynamic Binding Function” on page 178
■ “Displaying IP Source Guard” on page 178
■ “IP Source Guard Configuration Examples” on page 178
■ “Troubleshooting” on page 182
IP Source Guard
Overview
By filtering packets on a per-port basis, IP source guard prevents packets with
illegal IP addresses and MAC addresses from traveling through, improving the
network security. After receiving a packet, the port looks up the key attributes
(including IP address, MAC address and VLAN tag) of the packet in the binding
entries of the IP source guard. If there is a matching entry, the port will forward the
packet. Otherwise, the port will abandon the packet.
IP source guard filters packets based on the following types of binding entries:
■ IP-port binding entry
■ MAC-port binding entry
■ IP-MAC-port binding entry
You can manually set static binding entries, or use DHCP Snooping to provide
dynamic binding entries. Binding is on a per-port basis. After a binding entry is
configured on a port, it is effective only to the port, instead of other ports.
c
CAUTION: IP source guard and aggregation group configuration are mutually
exclusive.
Configuring a Static
Binding Entry
Follow these steps to configure a static binding entry:
To do… Use the command… Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
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