circuit-idhostname:portEnter the keywords circuit-id hostname:port to configure the circuit-id formatthat is sent to the server.trust-downstream Configure the system to trust Option 82 when it is received from the previous-hop router.vpn Enter the keyword vpn to add VPN/VRF related sub-option to relay agent informationOption 82.NOTE: Adds the VPN/VRF related sub-options into the relay agentinformation option(82). When DHCP broadcasts are forwarded by the relayagent from clients to DHCP server.Default Disabled.Command Modes CONFIGURATIONCommand History This guide is platform-specific. For command information about other platforms, see the relevant Dell NetworkingOS Command Line Reference Guide.Version Description9.11(2.0P0) Introduced the circuit-id attribute in the command.9.10(0.0) Introduced on the S6100-ON.9.8(1.0) Introduced on the Z9100–ON.9.8(0.0P5) Introduced on the S4048-ON.9.8(0.0P2) Introduced on the S3048-ON.9.7(0.0) Introduced on the S6000-ON.9.4.(0.0) Added support for VRF.9.0.2.0 Introduced on the S6000.8.3.19.0 Introduced on the S4820T.8.3.11.1 Introduced on the Z9000.8.3.7.0 Introduced on the S4810.8.3.1.0 Introduced on the E-Series.7.8.1.0 Introduced on C-Series and S-Series.Example Dell(conf)# ip dhcp relay information-option vpnip dhcp snooping verify mac-addressValidate a DHCP packet’s source hardware address against the client hardware address field (CHADDR) in the payload.Syntax [no] ip dhcp snooping verify mac-addressDefaults DisabledCommand Modes CONFIGURATIONDynamic Host Configuration Protocol (DHCP) 571
