Cisco Catalyst 2960-X User Manual

Smart Logging
When smart logging is enabled on the switch and an ACL configured with smart logging is attached to a Layer
2 interface (port ACL), the contents of packets denied or permitted because of the ACL are also sent to a
specified NetFlow collector.
Hardware and Software Treatment of IP ACLs
ACL processing is performed in hardware. If the hardware reaches its capacity to store ACL configurations,
all packets on that interface are dropped.
If an ACL configuration cannot be implemented in hardware due to an out-of-resource condition on a
switch or stack member, then only the traffic in that VLAN arriving on that switch is affected.
Note
For router ACLs, other factors can cause packets to be sent to the CPU:
•
Using the log keyword
•
Generating ICMP unreachable messages
When traffic flows are both logged and forwarded, forwarding is done by hardware, but logging must be done
by software. Because of the difference in packet handling capacity between hardware and software, if the sum
of all flows being logged (both permitted flows and denied flows) is of great enough bandwidth, not all of the
packets that are forwarded can be logged.
When you enter the show ip access-lists privileged EXEC command, the match count displayed does not
account for packets that are access controlled in hardware. Use the show platform acl counters hardware
privileged EXEC command to obtain some basic hardware ACL statistics for switched and routed packets.
Router ACLs function as follows:
•
The hardware controls permit and deny actions of standard and extended ACLs (input and output) for
security access control.
•
If log has not been specified, the flows that match a deny statement in a security ACL are dropped by
the hardware if ip unreachables is disabled. The flows matching a permit statement are switched in
hardware.
•
Adding the log keyword to an ACE in a router ACL causes a copy of the packet to be sent to the CPU
for logging only. If the ACE is a permit statement, the packet is still switched and routed in hardware.
VLAN Map Configuration Guidelines
VLAN maps are the only way to control filtering within a VLAN. VLAN maps have no direction. To filter
traffic in a specific direction by using a VLAN map, you need to include an ACL with specific source or
destination addresses. If there is a match clause for that type of packet (IP or MAC) in the VLAN map, the
default action is to drop the packet if the packet does not match any of the entries within the map. If there is
no match clause for that type of packet, the default is to forward the packet.
The following are the VLAN map configuration guidelines:
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29048-01 151
Configuring IPv4 ACLs
Hardware and Software Treatment of IP ACLs

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