CLI Guide

Defaults Not configured.
Command Modes INTERFACE
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
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.
The Dell Networking OS 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 the system
forwards to the client with source port=67, destination port=68.
ip helper-address hop-count disable
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
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information This command disables the incrementing of the hops field when boot requests are
relayed to a DHCP server through the Dell Networking OS. If the incoming boot
request already has a non-zero hops field, the message is relayed with the same
value for hops. However, the message is discarded if the hops field exceeds 16, to
comply with the relay agent behavior specified in RFC 1542.
IPv4 Routing
707