Cisco Catalyst 2960-X User Manual

PurposeCommand or Action
•
You can enter a single VLAN ID identified by VLAN ID number,
a series of VLAN IDs separated by commas, a range of VLAN
IDs separated by hyphens, or a range of VLAN IDs separated by
entering the starting and ending VLAN IDs separated by a space.
Enables the switch to insert and remove DHCP relay information
(option-82 field) in forwarded DHCP request messages to the DHCP
server. This is the default setting.
ip dhcp snooping information option
Example:
Switch(config)# ip dhcp snooping
information option
Step 5
(Optional) Configures the remote-ID suboption.ip dhcp snooping information option format
remote-id [string ASCII-string | hostname]
Step 6
You can configure the remote ID as:
Example:
Switch(config)# ip dhcp snooping
•
String of up to 63 ASCII characters (no spaces)
•
Configured hostname for the switch
information option format remote-id
string acsiistring2
If the hostname is longer than 63 characters, it is truncated
to 63 characters in the remote-ID configuration.
Note
The default remote ID is the switch MAC address.
(Optional) If the switch is an aggregation switch connected to an edge
switch, this command enables the switch to accept incoming DHCP
snooping packets with option-82 information from the edge switch.
ip dhcp snooping information option
allow-untrusted
Example:
Switch(config)# ip dhcp snooping
information option allow-untrusted
Step 7
The default setting is disabled.
Enter this command only on aggregation switches that are
connected to trusted devices.
Note
Specifies the interface to be configured, and enter interface configuration
mode.
interface interface-id
Example:
Switch(config)# interface
gigabitethernet2/0/1
Step 8
(Optional) Configures the circuit-ID suboption for the specified interface.
ip dhcp snooping vlan vlan information
option format-type circuit-id [override]
string ASCII-string
Step 9
Specify the VLAN and port identifier, using a VLAN ID in the range
of 1 to 4094. The default circuit ID is the port identifier, in the format
vlan-mod-port.
Example:
Switch(config-if)# ip dhcp snooping
You can configure the circuit ID to be a string of 3 to 63 ASCII
characters (no spaces).
vlan 1 information option format-type
curcuit-id override string ovrride2
(Optional) Use the override keyword when you do not want the
circuit-ID suboption inserted in TLV format to define subscriber
information.
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
224 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