Cisco Catalyst 2960-X User Manual

Enabling the Cisco IOS DHCP Server Database
For procedures to enable and configure the Cisco IOS DHCP server database, see the “DHCP Configuration
Task List” section in the “Configuring DHCP” chapter of the Cisco IOS IP Configuration Guide, Release 12.4
Monitoring DHCP Snooping Information
Table 20: Commands for Displaying DHCP Information
Displays the DHCP snooping configuration for a switchshow ip dhcp snooping
Displays only the dynamically configured bindings in the DHCP snooping
binding database, also referred to as a binding table.
show ip dhcp snooping binding
Displays the DHCP snooping binding database status and statistics.show ip dhcp snooping
database
Displays the DHCP snooping statistics in summary or detail form.show ip dhcp snooping
statistics
Display the dynamically and statically configured bindings.show ip source binding
If DHCP snooping is enabled and an interface changes to the down state, the switch does not delete the
statically configured bindings.
Note
Configuring DHCP Server Port-Based Address Allocation
Information About Configuring DHCP Server Port-Based Address Allocation
DHCP server port-based address allocation is a feature that enables DHCP to maintain the same IP address
on an Ethernet switch port regardless of the attached device client identifier or client hardware address.
When Ethernet switches are deployed in the network, they offer connectivity to the directly connected devices.
In some environments, such as on a factory floor, if a device fails, the replacement device must be working
immediately in the existing network. With the current DHCP implementation, there is no guarantee that DHCP
would offer the same IP address to the replacement device. Control, monitoring, and other software expect a
stable IP address associated with each device. If a device is replaced, the address assignment should remain
stable even though the DHCP client has changed.
When configured, the DHCP server port-based address allocation feature ensures that the same IP address is
always offered to the same connected port even as the client identifier or client hardware address changes in
the DHCP messages received on that port. The DHCP protocol recognizes DHCP clients by the client identifier
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
226 OL-29048-01
Configuring DHCP
Enabling the Cisco IOS DHCP Server Database

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