IPv4 Routing |
301
Related
Commands
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.
Syntax
ip helper-address
ip-address
To remove a DHCP server address, use the
no ip helper-address
command.
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
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
Command
History
Usage
Information
This command disables the incrementing of the hops field when boot requests are relayed to a DHCP
server through FTOS. If the incoming boot request already has a non-zero hops field, the message will
be 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.
ip domain-list
Configures additional names.
ip-address
Enter an IP address in dotted decimal format (A.B.C.D).
Version 8.3.16.1
Introduced on MXL 10/40GbE Switch IO Module
Version 8.3.16.1
Introduced on MXL 10/40GbE Switch IO Module
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