Dell POWEREDGE M1000E - Manual (Page 560)

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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-13270-03
Chapter 22 Configuring DHCP Features and IP Source Guard
Configuring IP Source Guard
IP Source Guard Configuration Guidelines
These are the configuration guides for IP source guard:
• You can configure static IP bindings only on nonrouted ports. If you enter the ip source binding
mac-address vlan vlan-id ip-address interface interface-id global configuration command on a
routed interface, this error message appears:
Static IP source binding can only be configured on switch port.
• When IP source guard with source IP filtering is enabled on an interface, DHCP snooping must be
enabled on the access VLAN to which the interface belongs.
• If you are enabling IP source guard on a trunk interface with multiple VLANs and DHCP snooping
is enabled on all the VLANs, the source IP address filter is applied on all the VLANs.
Note If IP source guard is enabled and you enable or disable DHCP snooping on a VLAN on the
trunk interface, the switch might not properly filter traffic.
• When IP source guard with source IP and MAC address filtering is enabled, DHCP snooping and
port security must be enabled on the interface. You must also enter the ip dhcp snooping
information option global configuration command and ensure that the DHCP server supports
option 82. When IP source guard is enabled with MAC address filtering, the DHCP host MAC
address is not learned until the host is granted a lease. When forwarding packets from the server to
the host, DHCP snooping uses the option-82 data to identify the host port.
• When configuring IP source guard on interfaces on which a private VLAN is configured, port
security is not supported.
• IP source guard is not supported on EtherChannels.
• You can enable this feature when IEEE 802.1x port-based authentication is enabled.
• If the number of hardware entries exceeds the maximum available, the CPU usage increases.
• In a switch stack, if IP source guard is configured on a stack member interface and you remove the
the configuration of that switch by entering the no switch stack-member-number provision global
configuration command, the interface static bindings are removed from the binding table, but they
are not removed from the running configuration. If you again provision the switch by entering the
switch stack-member-number provision command, the binding is restored.
To remove the binding from the running configuration, you must disable IP source guard before
entering the no switch provision command. The configuration is also removed if the switch reloads
while the interface is removed from the binding table. For more information about provisioned
switches, see the
Chapter 6, “Managing Switch Stacks.”