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Network protocols
7.5 DHCP server
SCALANCE XM-400/XR-500 Command Line Interface (CLI)
Configuration Manual, 06/2016, C79000-G8976-C252-11
361
7.5.3.10
relay-information
Description
With this command you define that devices with a certain remote ID and circuit ID are
assigned the IPv4 addresses from a specific address band.
If you create such an entry for an address band, address pool only reacts to DHCP queries
via a DHCP relay agent (option 82). You can create further address bands for the same
VLAN IP interfaces so that the pools react to different requests.
Note
Extension or release of an IPv4 address assigned via a relay agent.
With address assignments via a relay agent "Renew" and "Release" messages going directly
from the client to the server are ignored by the server.
•
The extension of the period for an IPv4 address assigned via a relay agent is achieved
using a "Rebinding" message that the client sends automatically as a broadcast.
•
To speed up the release of an IPv4 address assigned via a relay agent, configure a
shorter period of validity with the
lease-time
command.
Requirement
You are in the DHCPPOOL configuration mode.
The command prompt is as follows:
cli(config-dhcp-pool-<ID>)#
Syntax
Call up the command with the following parameters:
relay-information <remote-id> <circuit-id>
The parameters have the following meaning:
Parameter
Description
Range of values / note
remote-id
Remote ID of the device
Enter the remote ID of the de-
vice.
circuit-id
Circuit ID of the device.
Enter the circuit ID of the de-
vice.
Result
Devices with a certain remote ID and circuit ID are assigned the IPv4 addresses from a
specific address band. Before the IPv4 address band can be used, it still needs to be
activated.
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