Reference Guide

696 | IPv4 Routing
www.dell.com | support.dell.com
Parameters
Defaults
Not configured.
Command Modes
INTERFACE
Command
History
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.
ip helper-address hop-count disable
c e s
Disable the hop-count increment for the DHCP relay agent.
Syntax
ip helper-address hop-count disable
To re-enable the hop-count increment, use the no ip helper-address hop-count disable
command.
Defaults
Enabled; the hops field in the DHCP message header is incremented by default
Command Modes
CONFIGURATION
ip-address
Enter an IP address in dotted decimal format (A.B.C.D).
default-vrf (Optional) E-Series Only: Enter default-vrf for the DHCP server VRF
is using.
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.9.1.0 Introduced VRF on the E-Series
Version 7.6.1.0 Added support for S-Series
Version 7.5.1.0 Added support for C-Series
pre-Version 6.2.1.1 Introduced on E-Series