3Com 4210G Series, Configuration Manual, Page: 604 / 1133

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IP Source Guard Configuration
When configuring IP Source Guard, go to these sections for information you are interested in:
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IP Source Guard Overview
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Configuring a Static Binding Entry
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Configuring Dynamic Binding Function
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Displaying and Maintaining IP Source Guard
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IP Source Guard Configuration Examples
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Troubleshooting IP Source Guard
IP Source Guard Overview
By filtering packets on a per-port basis, IP source guard prevents illegal packets from traveling through,
thus 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 match, the port forwards the packet. Otherwise, the port discards the packet.
IP source guard filters packets based on the following types of binding entries:
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IP-port binding entry
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MAC-port binding entry
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IP-MAC-port binding entry
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IP-VLAN-port binding entry
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MAC-VLAN-port binding entry
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IP-MAC-VLAN-port binding entry
You can manually set static binding entries, or use DHCP snooping or DHCP relay 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.
Enabling IP source guard on a port is mutually exclusive with adding the port to an aggregation group.
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
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Enter interface view
interface interface-type
interface-number
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