D-Link DGS-3630-28SC Emulator 1 - Page 406
ip dhcp relay information check-reply
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide ip dhcp relay information check no ip dhcp relay information check Parameters None. Default By default, this option is disabled. Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline This command takes effect when the DHCP service is enabled. The ip dhcp relay information check command and the ip dhcp relay information check-reply command together determine whether the check function of Option 82 is effective for an interface. If the ip dhcp relay information check-reply command is not configured for an interface, the global setting takes effect. If the ip dhcp relay information check-reply command is configured for an interface, the interface setting takes effect. When the check for Option 82 of the reply packet is enabled, the device will check the validity of the Option 82 field in DHCP reply packets it receives from the DHCP server. If the Option 82 field in the received packet is not present or the option is not the original option inserted by the agent (by checking the remote ID sub-option, the relay agent drops the packet. Otherwise, the relay agent removes the Option 82 field and forwards the packet. If the check is disabled, the packet will be directly forwarded. Example This example shows how to enable the global DHCP relay agent check. Switch# configure terminal Switch(config)# ip dhcp relay information check Switch(config)# 24-3 ip dhcp relay information check-reply This command is used to configure the DHCP relay agent to validate the relay agent information option in the received DHCP reply packet. Use the no form of this command to remove the configuration for the interface. ip dhcp relay information check-reply [none] no ip dhcp relay information check-reply [none] Parameters none (Optional) Specifies to disable check for Option 82 of the reply packet. Default None. 401
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