Dell Force10 Z9000 FTOS Command Line Reference Guide for the Z9000 System FTOS - Page 788
ip helper-address, Optional C-Series and E-Series Only: Enter the keyword
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ip helper-address Specify the address of a DHCP server so that DHCP broadcast messages can be forwarded when the DHCP server is not on the same subnet as the client. C-Series, E-Series, S-Series, Z-Series, S4810 Syntax Parameters ip helper-address ip-address | ipv6-address | default-vrf To remove a DHCP server address, use the no ip helper-address command. ip-address ipv6-address default-vrf Enter an IP address in dotted decimal format (A.B.C.D). C-Series and E-Series only: Enter the IPv6 address in the x:x:x:x:x::x format. NOTE: The :: notation specifies successive hexadecimal fields of zeros. (Optional) C-Series and E-Series Only: Enter the keyword defaultvrf for the DHCP server VRF is using. Defaults Command Modes Command History Not configured. INTERFACE Version 9.0.0.0 Version 8.3.11.1 Version 8.3.7.0 Version 8.1.1.0 Version 7.9.1.0 Version 7.6.1.0 Version 7.5.1.0 pre-Version 6.2.1.1 Added support for IPv6. Introduced on the Z9000. Introduced on the S4810. Introduced on the E-Series ExaScale. Introduced VRF on the E-Series. Introduced on the S-Series. Introduced on the C-Series. Introduced on the E-Series. Usage Information You can add multiple DHCP servers by entering the ip helper-address command multiple times. If multiple servers are defined, an incoming request is sent simultaneously to all configured servers and the reply is forwarded to the DHCP client. FTOS uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay services. It listens on port 67 and if it receives a broadcast, the software converts it to unicast, and forwards to it to the DHCP-server with source port=68 and destination port=67. The server replies with source port=67, destination port=67 and FTOS forwards to the client with source port=67, destination port=68. 788
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