Dell PowerConnect 8024 User Manual

Snooping and Inspecting Traffic 757
What Is IP Source Guard?
IPSG is a security feature that filters IP packets based on source ID. This
feature helps protect the network from attacks that use IP address spoofing to
compromise or overwhelm the network.
The source ID may be either the source IP address or a {source IP address,
source MAC address} pair. You can configure:
• Whether enforcement includes the source MAC address
• Static authorized source IDs
The DHCP snooping bindings database and static IPSG entries identify
authorized source IDs. IPSG can be enabled on physical and LAG ports.
If you enable IPSG on a port where DHCP snooping is disabled or where
DHCP snooping is enabled but the port is trusted, all IP traffic received on
that port is dropped depending on the admin-configured IPSG entries.
IPSG and Port Security
IPSG interacts with port security, also known as port MAC locking, (see "Port
Security (Port-MAC Locking)" on page 507) to enforce the source MAC
address. Port security controls source MAC address learning in the layer 2
forwarding database (MAC address table). When a frame is received with a
previously unlearned source MAC address, port security queries the IPSG
feature to determine whether the MAC address belongs to a valid binding.
If IPSG is disabled on the ingress port, IPSG replies that the MAC is valid. If
IPSG is enabled on the ingress port, IPSG checks the bindings database. If
the MAC address is in the bindings database and the binding matches the
VLAN the frame was received on, IPSG replies that the MAC is valid. If the
MAC is not in the bindings database, IPSG informs port security that the
frame is a security violation.
In the case of an IPSG violation, port security takes whatever action it
normally takes upon receipt of an unauthorized frame. Port security limits the
number of MAC addresses to a configured maximum. If the limit
n is less
than the number of stations
m in the bindings database, port security allows
only
n stations to use the port. If n > m , port security allows only the stations
in the bindings database. For information about configuring the Port Security
feature, see "Configuring Port and System Security" on page 469.

Dell PowerConnect 8024 Specifications

General

Switching Capacity	480 Gbps
Stackable	Yes
Device Type	Switch
Enclosure Type	Rack-mountable
Power Redundancy	Optional
Width	17.3 in
Height	1.7 in
Jumbo Frame Support	Yes
Ports	24 x 10 Gigabit SFP+
Management	Web-based GUI, Command Line Interface (CLI), SNMP
VLAN Support	Yes
Power Supply	Internal
Routing Protocol	Static routing
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z
Operating Temperature	0 to 45 °C
Storage Temperature	-20 to 70 °C
Relative Humidity	10% to 90% (non-condensing)
MAC Address Table Size	32, 000 entries