Default Configuration For Dhcp Snooping - Cisco Catalyst 4500 series Administration Manual

Chapter 53 Configuring DHCP Snooping, IP Source Guard, and IPSG for Static Hosts
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Note For DHCP server configuration information, refer to "Configuring DHCP" in the Cisco IOS IP and IP
Routing Configuration Guide at:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfdhcp.html

Default Configuration for DHCP Snooping

DHCP snooping is disabled by default.
DHCP snooping option.
Table 53-1
Option
DHCP snooping
DHCP snooping information option
DHCP snooping information option
allow-untrusted
DHCP snooping limit rate
DHCP snooping trust
DHCP snooping vlan
If you want to change the default configuration values, see the
Enabling DHCP Snooping
When DHCP snooping is enabled globally, DHCP requests are dropped until the ports are configured.
Note
Consequently, you should probably configure this feature during a maintenance window and not during
production.
OL_28731-01
Enabling DHCP Snooping on the Aggregation Switch, page 53-9
Enabling DHCP Snooping and Option 82, page 53-10
Enabling DHCP Snooping on Private VLAN, page 53-12
Configuring DHCP Snooping on Private VLAN, page 53-12
Configuring DHCP Snooping with an Ethernet Channel Group, page 53-12
Enabling the DHCP Snooping Database Agent, page 53-13
Limiting the Rate of Incoming DHCP Packets, page 53-13
Configuration Examples for the Database Agent, page 53-15
Default Configuration Values for DHCP Snooping
Table 53-1 shows all the default configuration values for each
Default Value/State
Disabled
Enabled
Disabled
Infinite (functions as if rate limiting were disabled)
Untrusted
Disabled
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Configuring DHCP Snooping
"Enabling DHCP Snooping" section.
53-7