Chapter 23 IP Source Guard
Figure 103 DHCP Snooping Port Configure
The following table describes the labels in this screen.
Table 69 DHCP Snooping Port Configure
LABEL | DESCRIPTION |
Port | This field displays the port number. If you configure the * port, the settings |
| are applied to all of the ports. |
|
|
Server Trusted state | Select whether this port is a trusted port (Trusted) or an untrusted port |
| (Untrusted). |
| Trusted ports are connected to DHCP servers or other switches, and the |
| Switch discards DHCP packets from trusted ports only if the rate at which |
| DHCP packets arrive is too high. |
| Untrusted ports are connected to subscribers, and the Switch discards |
| DHCP packets from untrusted ports in the following situations: |
| • The packet is a DHCP server packet (for example, OFFER, ACK, or |
| NACK). |
| • The source MAC address and source IP address in the packet do not |
| match any of the current bindings. |
| • The packet is a RELEASE or DECLINE packet, and the source MAC |
| address and source port do not match any of the current bindings. |
| • The rate at which DHCP packets arrive is too high. |
|
|
Rate (pps) | Specify the maximum number for DHCP packets |
| receives from each port each second. The Switch discards any additional |
| DHCP packets. Enter 0 to disable this limit, which is recommended for |
| trusted ports. |
|
|
Apply | Click Apply to save your changes to the Switch’s |
| Switch loses these changes if it is turned off or loses power, so use the |
| Save link on the top navigation panel to save your changes to the non- |
| volatile memory when you are done configuring. |
|
|
Cancel | Click this to reset the values in this screen to their |
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194 |
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