Cisco Catalyst 2960-X User Manual

Default SettingsFeature
When dynamic ARP inspection is enabled, all denied
or dropped ARP packets are logged.
The number of entries in the log is 32.
The number of system messages is limited to 5 per
second.
The logging-rate interval is 1 second.
Log buffer
All denied or dropped ARP packets are logged.Per-VLAN logging
Relative Priority of ARP ACLs and DHCP Snooping Entries
Dynamic ARP inspection uses the DHCP snooping binding database for the list of valid IP-to-MAC address
bindings.
ARP ACLs take precedence over entries in the DHCP snooping binding database. The switch uses ACLs only
if you configure them by using the ip arp inspection filter vlan global configuration command. The switch
first compares ARP packets to user-configured ARP ACLs. If the ARP ACL denies the ARP packet, the
switch also denies the packet even if a valid binding exists in the database populated by DHCP snooping.
Configuring ARP ACLs for Non-DHCP Environments
This procedure shows how to configure dynamic ARP inspection when Switch B shown in Figure 2 does not
support dynamic ARP inspection or DHCP snooping.
If you configure port 1 on Switch A as trusted, a security hole is created because both Switch A and Host 1
could be attacked by either Switch B or Host 2. To prevent this possibility, you must configure port 1 on
Switch A as untrusted. To permit ARP packets from Host 2, you must set up an ARP ACL and apply it to
VLAN 1. If the IP address of Host 2 is not static (it is impossible to apply the ACL configuration on Switch
A) you must separate Switch A from Switch B at Layer 3 and use a router to route packets between them.
Follow these steps to configure an ARP ACL on Switch A. This procedure is required in non-DHCP
environments.
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
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Configuring Dynamic ARP Inspection
Relative Priority of ARP ACLs and DHCP Snooping Entries

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