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Access Control Lists (ACLs)
This chapter describes access control lists (ACLs), prefix lists, and route-maps.
At their simplest, ACLs, prefix lists, and route-maps permit or deny traffic based on MAC and/or IP addresses. This chapter
describes implementing IP ACLs, IP prefix lists and route-maps. For MAC ACLS, refer to Layer 2.
An ACL is essentially a filter containing some criteria to match (examine IP, transmission control protocol [TCP], or user
datagram protocol [UDP] packets) and an action to take (permit or deny). ACLs are processed in sequence so that if a packet
does not match the criterion in the first filter, the second filter (if configured) is applied. When a packet matches a filter, the
switch drops or forwards the packet based on the filters specified action. If the packet does not match any of the filters in the
ACL, the packet is dropped (implicit deny).
The number of ACLs supported on a system depends on your content addressable memory (CAM) size. For more information,
refer to the Content Addressable Memory (CAM) chapter.
Topics:
IP Access Control Lists (ACLs)
Implementing ACL on the Dell Networking OS
ACLs and VLANs
ACL Optimization
Determine the Order in which ACLs are Used to Classify Traffic
IP Fragment Handling
IP Fragments ACL Examples
Layer 4 ACL Rules Examples
Configure a Standard IP ACL
Configuring a Standard IP ACL Filter
Configure an Extended IP ACL
Configuring Filters with a Sequence Number
Configuring Filters Without a Sequence Number
Established Flag
Configure Layer 2 and Layer 3 ACLs
Assign an IP ACL to an Interface
Applying an IP ACL
Counting ACL Hits
Configure Ingress ACLs
Configure Egress ACLs
Applying Egress Layer 3 ACLs (Control-Plane)
IP Prefix Lists
Configuration Task List for Prefix Lists
Creating a Prefix List
Creating a Prefix List Without a Sequence Number
Viewing Prefix Lists
Applying a Prefix List for Route Redistribution
Applying a Filter to a Prefix List (OSPF)
ACL Remarks
ACL Resequencing
Resequencing an ACL or Prefix List
Route Maps
Important Points to Remember
Configuration Task List for Route Maps
Creating a Route Map
Configure Route Map Filters
Configuring Match Routes
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