Chapter 25
| DHCP Commands
DHCP Relay Option 82
– 640 –
â—† You must specify the IP address for at least one active DHCP server. Otherwise,
the switch’s DHCP relay agent will not be able to forward client requests to a
DHCP server. Up to five DHCP servers can be specified in order of preference.
If any of the specified DHCP server addresses are not located in the same
network segment with this switch, use the ip default-gateway or ipv6 default-
gateway command to specify the default router through which this switch can
reach other IP subnetworks.
Example
Console(config)#ip dhcp relay server 192.168.10.19
Console(config)#
ip dhcp relay
information option
This command enables DHCP Option 82 information relay, and specifies the frame
format to use for the remote-id when Option 82 information is generated by the
switch. Use the no form of this command to disable this feature.
Syntax
ip dhcp relay information option
[encode no-subtype]
[remote-id {ip-address [encode {ascii | hex}] |
mac-address [encode {ascii | hex}] | string string}]
no ip dhcp rely information option [encode no-subtype]
[remote-id [ip-address encode] | [mac-address encode]]
encode no-subtype - Disables use of sub-type and sub-length fields in
circuit-ID (CID) and remote-ID (RID) in Option 82 information.
mac-address - Includes a MAC address field for the relay agent (that is, the
MAC address of the switch’s CPU).
ip-address - Includes the IP address field for the relay agent (that is, the IP
address of the management interface).
encode - Indicates encoding in ASCII or hexadecimal.
string - An arbitrary string inserted into the remote identifier field.
(Range: 1-32 characters)
Default Setting
Option 82: Disabled
CID/RID sub-type: Enabled
Remote ID: MAC address
Command Mode
Global Configuration
Usage Guidelines
â—† Using this command with or without any keywords will enable DHCP Option 82
information relay. You must also specify the IP address for at least one active
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