What are port ACLs?
The port ACL (PACL) feature provides the ability to perform access control on specific Layer 2 ports. A Layer 2 port is a physical LAN or trunk port that belongs to a VLAN. Port ACLs are applied only on the ingress traffic.
Is ACL a Layer 2 or Layer 3?
MAC ACLs are used for Layer 2. IP ACLs are used for Layer 3. Each ACL contains a set of rules that apply to inbound traffic. Each rule specifies whether the contents of a given field should be used to permit or deny access to the network, and may apply to one or more of the fields within a packet.
What is the difference between ACL and VACL?
The VACL applies to traffic in the VLAN. You can use a regular access-list or a mac-address access-list for this.” “You apply an ACL to the SVI to control how traffic is routedBETWEEN VLANs on an L3 switch. An ACL applied to an SVI does nothing to control the traffic on the VLAN itself.
What is port access control?
You can use port access control to protect against unauthorized use of ports. You can control an application’s ability to explicitly bind to, or listen on, specific TCP and UDP ports or port ranges by either reserving particular ports or by controlling access to unreserved ports.
How does ACL VLAN work?
VLAN ACL (also called VLAN map) provides packet filtering for all types of traffic that are bridged within a VLAN or routed into or out of the VLAN. Unlike Router ACL, VACL is not defined by a direction (input or output). All packets entering the VLAN (bridged or routed) are checked against the VACL.
Can you place an ACL on a switch?
Port ACL. Port ACLs are similar to Router ACLs but are supported on physical interfaces and configured on Layer 2 interfaces on a switch. Port ACL supports only inbound traffic filtering. Port ACL can be configured as three type access lists: standard, extended, and MAC-extended.
What is L2 access control?
Layer 2 Access Control Lists Feature Highlights Allows users to apply sequence numbers to permit or deny statements. • Layer 2 ACLs can be applied on interfaces, VLAN subinterfaces, bundle-Ethernet interfaces, bundle subinterfaces with L2 transport.
What is vacl in networking?
A VLAN access control list (VACL) provides access control for all packets that are bridged within a VLAN or that are routed into or out of a VLAN. Unlike regular Cisco IOS access control lists that are configured on router interfaces and applied on routed packets only, VACLs apply to all packets.
What happens if I set Access-Group mode prefer port?
Note If we set access-group mode prefer port, it will not only overwrite the effect of other ACLs, but also other features like Netflow (applied to SVI interface) will be affected. Note A PACL can be configured on a trunk port only after prefer port mode has been selected.
What is the default access group mode for ACLS?
This is the default access group mode. You configure the access-group mode command on each interface. The default is merge mode. Note If we set access-group mode prefer port, it will not only overwrite the effect of other ACLs, but also other features like Netflow (applied to SVI interface) will be affected.
What is merge mode in Access Group mode?
Merge mode—In this mode, the PACL, VACL, and Cisco IOS ACLs are merged in the ingress direction following the logical serial model shown in Figure 51-2. This is the default access group mode. You configure the access-group mode command on each interface. The default is merge mode.
What are privileged access groups and how are they used?
The use of privileged access groups supports the stage-based content creation process provided by the application, allowing separation of the authoring, approval, and publication roles.