HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 76
Configuring Option 82
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Step 1. Enter system view. Command system-view 2. Enable DHCP snooping. dhcp snooping enable 3. Enter interface view. interface interface-type interface-number 4. Specify the port as a trusted port. dhcp snooping trust 5. Return to system view. 6. Enter interface view. quit interface interface-type interface-number 7. (Optional.) Enable recording of DHCP snooping entries. dhcp snooping binding record Remarks N/A By default, DHCP snooping is disabled. This interface is connected to the DHCP server. By default, all ports are untrusted ports after DHCP snooping is enabled. N/A This interface is connected to the DHCP client. By default, after DHCP snooping is enabled, recording of DHCP snooping entries is disabled. Configuring Option 82 Follow these guidelines when you configure Option 82: • If you configure Option 82 on an Ethernet interface that has been added to an aggregation group, the settings do not take effect unless the interface is removed from the aggregation group. • To support Option 82, you must configure Option 82 on both the DHCP server and the DHCP snooping device. For information about configuring Option 82 on the DHCP server, see "Enabling handling of Option 82." • If the handling strategy is configured as replace, you must configure a padding format for Option 82. If the handling strategy is keep or drop, there is no need to configure any padding format. • If Option 82 contains the device name, the device name must contain no spaces. Otherwise, DHCP snooping drops the message. You can use the sysname command to specify the device name. For more information about this command, see Fundamentals Command Reference. • If DHCP snooping and QinQ work together or DHCP snooping receives a DHCP packet with two VLAN tags, and the verbose padding format is adopted for Option 82, DHCP snooping fills the VLAN ID field of sub-option 1 with outer VLAN tag.inner VLAN tag. For example, if the outer VLAN tag is 10 (a in hexadecimal) and the inner VLAN tag is 20 (14 in hexadecimal), the VLAN ID is 000a.0014. To configure DHCP snooping to support Option 82: Step 1. Enter system view. 2. Enter interface view. 3. Enable DHCP snooping to support Option 82. Command system-view interface interface-type interface-number dhcp snooping information enable Remarks N/A N/A By default, DHCP snooping does not support Option 82. 67