FTOS Configuration Guide for the C-Series - Force10 Networks

To pass traffic through a configured IP ACL, you must assign that ACL to a physical interface, a port
channel interface, or a VLAN. The IP ACL is applied to all traffic entering a physical or port channel
interface and the traffic is either forwarded or dropped depending on the criteria and actions specified in
the ACL.
The same ACL may be applied to different interfaces and that changes its functionality. For example, you
can take ACL "ABCD", and apply it using the in keyword and it becomes an ingress access list. If you
apply the same ACL using the out keyword, it becomes an egress access list. If you apply the same ACL
to the loopback interface, it becomes a loopback access list.
This chapter covers the following topics:
• Configuring Ingress ACLs on page 345
• Configuring Egress ACLs on page 346
• Configuring ACLs to Loopback on page 348
For more information on Layer-3 interfaces, refer to Chapter 13, Interfaces, on page 245.
To apply an IP ACL (standard or extended) to a physical or port channel interface, use these commands in
the following sequence in the INTERFACE mode:
Step Command Syntax Command Mode Purpose
1 interface interface slot/port CONFIGURATION Enter the interface number.
2 ip address ip-address INTERFACE Configure an IP address for the interface,
placing it in Layer-3 mode.
3
4
ip access-group
access-list-name {in | out}
[implicit-permit] [vlan
vlan-range]
ip access-list [standard |
extended] name
INTERFACE Apply an IP ACL to traffic entering or exiting
an interface.
• out: configure the ACL to filter outgoing
traffic. This keyword is supported only on
E-Series.
Note: The number of entries allowed per
ACL is hardware-dependent. Refer to
your line card documentation for detailed
specification on entries allowed per ACL.
INTERFACE Apply rules to the new ACL.
344 IP Access Control Lists, Prefix Lists, and Route-maps