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| Chapter 25 IP Source Guard |
| Table 76 ARP Inspection VLAN Configure (continued) | |
| LABEL | DESCRIPTION |
| VID | This field displays the VLAN ID of each VLAN in the range specified |
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| above. If you configure the * VLAN, the settings are applied to all |
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| VLANs. |
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| Enabled | Select Yes to enable ARP inspection on the VLAN. Select No to disable |
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| ARP inspection on the VLAN. |
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| Log | Specify when the Switch generates log messages for receiving ARP |
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| packets from the VLAN. |
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| None: The Switch does not generate any log messages when it |
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| receives an ARP packet from the VLAN. |
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| Deny: The Switch generates log messages when it discards an ARP |
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| packet from the VLAN. |
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| Permit: The Switch generates log messages when it forwards an ARP |
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| packet from the VLAN. |
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| All: The Switch generates log messages every time it receives an ARP |
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| packet from the VLAN. |
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| Apply | Click Apply to save your changes to the Switch’s |
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| Switch loses these changes if it is turned off or loses power, so use the |
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| Save link on the top navigation panel to save your changes to the non- |
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| volatile memory when you are done configuring. |
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| Cancel | Click this to reset the values in this screen to their |
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25.10 Technical Reference
This section provides technical background information on the topics discussed in this chapter.
25.10.1 DHCP Snooping Overview
Use DHCP snooping to filter unauthorized DHCP packets on the network and to build the binding table dynamically. This can prevent clients from getting IP addresses from unauthorized DHCP servers.
25.10.1.1 Trusted vs. Untrusted Ports
Every port is either a trusted port or an untrusted port for DHCP snooping. This setting is independent of the trusted/untrusted setting for ARP inspection. You can also specify the maximum number for DHCP packets that each port (trusted or untrusted) can receive each second.
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