Cisco Catalyst 2960-X User Manual

•
You must configure the switch to use the Cisco IOS DHCP server binding database to use it for DHCP
snooping.
•
To use the DHCP snooping option of accepting packets on untrusted inputs, the switch must be an
aggregation switch that receives packets with option-82 information from an edge switch.
•
The following prerequisites apply to DHCP snooping binding database configuration:
◦
You must configure a destination on the DHCP snooping binding database to use the switch for
DHCP snooping.
◦
Because both NVRAM and the flash memory have limited storage capacity, we recommend that
you store the binding file on a TFTP server.
◦
For network-based URLs (such as TFTP and FTP), you must create an empty file at the configured
URL before the switch can write bindings to the binding file at that URL. See the documentation
for your TFTP server to determine whether you must first create an empty file on the server; some
TFTP servers cannot be configured this way.
◦
To ensure that the lease time in the database is accurate, we recommend that you enable and
configure Network Time Protocol (NTP).
◦
If NTP is configured, the switch writes binding changes to the binding file only when the switch
system clock is synchronized with NTP.
•
Before configuring the DHCP relay agent on your switch, make sure to configure the device that is
acting as the DHCP server. You must specify the IP addresses that the DHCP server can assign or
exclude, configure DHCP options for devices, or set up the DHCP database agent.
•
If you want the switch to relay DHCP packets, the IP address of the DHCP server must be configured
on the switch virtual interface (SVI) of the DHCP client.
•
If a switch port is connected to a DHCP server, configure a port as trusted by entering the ip dhcp
snooping trust interface configuration command.
•
If a switch port is connected to a DHCP client, configure a port as untrusted by entering the no ip dhcp
snooping trust interface configuration command.
Related Topics
DHCP Snooping, on page 210
Enabling DHCP Snooping and Option 82
Follow these steps to enable DHCP snooping on the switch:
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
222 OL-29048-01
Configuring DHCP
Enabling DHCP Snooping and Option 82

Cisco Catalyst 2960-X Specifications

General

Console port	RJ-45
USB 2.0 ports quantity	2
SFP module slots quantity	4
Installed SFP modules quantity	-
Gigabit Ethernet (copper) ports quantity	48
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Power source	AC
Input current	5 A
AC input voltage	100 - 240 V
Power consumption (typical)	60.9 W
Number of power supply units	1
Redundant power supply (RPS) support	Yes
Operating altitude	0 - 3000 m
Non-operating altitude	0 - 4000 m
Storage temperature (T-T)	-25 - 70 °C
Operating temperature (T-T)	-5 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Switching protocols	UDP, TCP, RADIUS/TACACS+
Number of VLANs	1023
Networking standards	IEEE 802.1ab, IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ae, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3at, IEEE 802.3az, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Throughput	107.1 Mpps
Jumbo frames	9216
Number of queues	8
MAC address table	16000 entries
Number of static routes	1000
DHCP features	DHCP server
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, SNMP, SSH
Access Control List (ACL) rules	3
Switch type	Managed
Switch layer	L2/L3
Safety	UL 60950-1, CAN/CSA-C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950-1
Form factor	1U
Product color	Black
Total Power over Ethernet (PoE) budget	370 W
Power over Ethernet (PoE) ports quantity	24
Power over Ethernet plus (PoE+) ports quantity	12
Memory type	DRAM
Noise level	39 dB
Flash memory	128 MB
Internal memory	512 MB
Processor frequency	600 MHz
Mean time between failures (MTBF)	276870 h

Weight and Dimensions

Depth	368 mm
Width	445 mm
Height	45 mm
Weight	5800 g