Minimum Dhcp Snooping Configuration - Cisco 7604 Configuration Manual
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DHCP Snooping Configuration Restrictions and Guidelines
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Minimum DHCP Snooping Configuration
The minimum configuration steps for the DHCP snooping feature are as follows:
1.
2.
3.
4.
5.
If you are configuring the switch for DHCP relay, the following additional steps are required:
1.
2.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
37-8
You can enable DHCP snooping on private VLANs:
If DHCP snooping is enabled, any primary VLAN configuration is propagated to its associated
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secondary VLANs.
If DHCP snooping is configured on the primary VLAN and you configure DHCP snooping with
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different settings on an associated secondary VLAN, the configuration on the secondary VLAN
does not take effect.
If DHCP snooping is not configured on the primary VLAN and you configure DHCP snooping
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on a secondary VLAN, the configuration takes affect only on the secondary VLAN.
When you manually configure DHCP snooping on a secondary VLAN, this message appears:
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DHCP Snooping configuration may not take effect on secondary vlan XXX
The show ip dhcp snooping command displays all VLANs (both primary and secondary) that
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have DHCP snooping enabled.
Define and configure the DHCP server.
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
Enable DHCP snooping on at least one VLAN.
By default, DHCP snooping is inactive on all VLANs. Refer to the
VLANs" section on page 37-12
Ensure that DHCP server is connected through a trusted interface.
By default, the trust state of all interfaces is untrusted. Refer to the
State on Layer 2 LAN Interfaces" section on page 37-13
Configure the DHCP snooping database agent.
This step ensures that database entries are restored after a restart or switchover. Refer to the
"Configuring the DHCP Snooping Database Agent" section on page 37-14
Enable DHCP snooping globally.
The feature is not active until you complete this step. Refer to the
Globally" section on page 37-9
Define and configure the DHCP relay agent IP address.
If the DHCP server is in a different subnet from the DHCP clients, configure the server IP address
in the helper address field of the client side VLAN.
Configure DHCP option-82 on untrusted port.
Refer to the
"Enabling the DHCP Option-82 on Untrusted Port Feature" section on page 37-10
Chapter 37
Configuring DHCP Snooping
"Enabling DHCP Snooping on
"Configuring the DHCP Trust
"Enabling DHCP Snooping
OL-4266-08
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