Switch Security
6-15
applied ACLs to verify the packet has the required permissions to be forwarded, based on the criteria
specified in the access lists.
Use the
Wireless Firewall
screen to view, add and configure access control configurations. Typically, an
ACL consists of series of entries called an Access Control Entry (ACE). Each ACE defines the rule which
defines whether the packets needs to be switched/routed or needs to be dropped. The ACL screen displays
three tabs:
• Security Policy
• Configuration
• Statistics
Each of these tabs has sub tabs which provide configuration options for creating and attaching the ACLs.
6.4.1 ACL Overview
An ACL contains an ordered list of
Access Control Entries
(ACEs). Each ACE specifies an action and a set of
conditions that a packet must satisfy in order to match the ACE. The order of conditions in the list is critical
because the switch stops testing conditions after the first match.
The switch supports the following ACLs to filter traffic:
•
Router ACLs
— Applied to VLAN (Layer 3) interfaces. These ACLs filter traffic based on Layer 3
parameters like
source IP, destination IP, protocol types
and
port numbers.
They are applied on packets
routed through the switch. Router ACLs can be applied to inbound traffic only, not both directions.
•
Port ACLs
— Applied to traffic entering a Layer 2 interface. Only switched packets are subjected to these
kind of ACLs. Traffic filtering is based on Layer 2 parameters like–
source MAC, destination MAC
,
Ethertype, VLAN-ID, 802.1p bits
(OR) Layer 3 parameters like– source IP, destination IP, protocol, port
number.
•
Wireless LAN ACLs
- A Wireless LAN ACL is designed to filter/mark packets based on the wireless LAN
from which they arrived rather than filtering the packets arrived on Layer 2 ports.
For more information, see
•
Router ACLs
•
Port ACLs
•
Wireless LAN ACLs
•
ACL Actions
•
Precedence Order
NOTE:
If a packet does not meet any of the criteria specified in the ACL, the packet is
dropped.
NOTE:
For an overview of how the switch uses an ACL to filter permissions to the switch
managed network, go to
ACL Overview on page 6-15
.
NOTE:
Port and router ACLs can be applied only in an inbound direction. WLAN ACLs
support applying ACLs in the inbound and outbound direction.
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