Cisco Catalyst 2960-X User Manual

As with port ACLs, the switch examines ACLs associated with features configured on a given interface. As
packets enter the switch on an interface, ACLs associated with all inbound features configured on that interface
are examined. After packets are routed and before they are forwarded to the next hop, all ACLs associated
with outbound features configured on the egress interface are examined.
ACLs permit or deny packet forwarding based on how the packet matches the entries in the ACL, and can be
used to control access to a network or to part of a network.
VLAN Maps
VLAN ACLs or VLAN maps are used to control network traffic within a VLAN. You can apply VLAN maps
to all packets that are bridged within a VLAN in the switch or switch stack. VACLs are strictly for security
packet filtering and for redirecting traffic to specific physical interfaces. VACLs are not defined by direction
(ingress or egress).
All non-IP protocols are access-controlled through MAC addresses and Ethertype using MAC VLAN maps.
(IP traffic is not access controlled by MAC VLAN maps.) You can enforce VLAN maps only on packets
going through the switch; you cannot enforce VLAN maps on traffic between hosts on a hub or on another
switch connected to this switch.
With VLAN maps, forwarding of packets is permitted or denied, based on the action specified in the map.
This shows how a VLAN map is applied to prevent a specific type of traffic from Host A in VLAN 10 from
being forwarded. You can apply only one VLAN map to a VLAN.
Figure 5: Using VLAN Maps to Control Traffic
ACEs and Fragmented and Unfragmented Traffic
IP packets can be fragmented as they cross the network. When this happens, only the fragment containing the
beginning of the packet contains the Layer 4 information, such as TCP or UDP port numbers, ICMP type and
code, and so on. All other fragments are missing this information.
Some access control entries (ACEs) do not check Layer 4 information and therefore can be applied to all
packet fragments. ACEs that do test Layer 4 information cannot be applied in the standard manner to most
of the fragments in a fragmented IP packet. When the fragment contains no Layer 4 information and the ACE
tests some Layer 4 information, the matching rules are modified:
•
Permit ACEs that check the Layer 3 information in the fragment (including protocol type, such as TCP,
UDP, and so on) are considered to match the fragment regardless of what the missing Layer 4 information
might have been.
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29048-01 145
Configuring IPv4 ACLs
ACEs and Fragmented and Unfragmented Traffic

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