Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 268)

218 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
DHCP Snooping
10
Example
This example enables DHCP snooping globally for the switch.
Console(config)#ip dhcp snooping
Console(config)#
Related Commands
ip dhcp snooping vlan (220)
ip dhcp snooping trust (222)
ip dhcp snooping information option
This command enables the use of DHCP Option 82 information for the switch, and specifies the
frame format to use for the remote-id when Option 82 information is generated by the switch. Use
the no form without any keywords to disable this function, the no form with the encode no-subtype
keyword to enable use of sub-type and sub-length in CID/RID fields, or the no form with the
remote-id keyword to set the remote ID to the switch’s MAC address encoded in hexadecimal.
Syntax
ip dhcp snooping information option
[encode no-subtype] [remote-id {ip-address [encode {ascii | hex}] |
mac-address [encode {ascii | hex}] | string string}]
no ip dhcp snooping 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 - Inserts a MAC address in the remote ID sub-option for the DHCP snooping
agent (that is, the MAC address of the switch’s CPU).
ip-address - Inserts an IP address in the remote ID sub-option for the DHCP snooping
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 (hexadecimal)
Command Mode
Global Configuration
Command Usage
• DHCP provides a relay mechanism for sending information about the switch and its DHCP
clients to the DHCP server. Known as DHCP Option 82, it allows compatible DHCP servers to
use the information when assigning IP addresses, or to set other services or policies for clients.