Cisco Systems 3560 Applying a MAC ACL to a Layer 2 Interface

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Catalyst 3560 Switch Software Configuration Guide

OL-8553-06

Chapter 33 Configuring Network Security with ACLs

Creating Named MAC Extended ACLs

Use the no mac access-list extended name global configuration command to delete the entire ACL. You

can also delete individual ACEs from named MAC extended ACLs.

This example shows how to create and display an access list named mac1, denying only EtherType

DECnet Phase IV traffic, but permitting all other types of traffic.

Switch(config)# mac access-list extended mac1

Switch(config-ext-macl)# deny any any decnet-iv

Switch(config-ext-macl)# permit any any

Switch(config-ext-macl)# end

Switch # show access-lists

Extended MAC access list mac1

10 deny any any decnet-iv

20 permit any any

Applying a MAC ACL to a Layer 2 Interface

After you create a MAC ACL, you can apply it to a Layer 2 interface to filter non-IP traffic coming in

that interface. When you apply the MAC ACL, consider these guidelines:

• If you apply an ACL to a Layer 2 interface that is a member of a VLAN, the Layer 2 (port) ACL

takes precedence over an input Layer 3 ACL applied to the VLAN interface or a VLAN map applied

to the VLAN. Incoming packets received on the Layer 2 port are always filtered by the port ACL.

• You can apply no more than one IP access list and one MAC access list to the same Layer 2

interface. The IP access list filters only IP packets, and the MAC access list filters non-IP packets.

Step 3 {deny | permit} {any | host source MAC

address | source MAC address mask} {any |

host destination MAC address | destination

MAC address mask} [type mask | lsap lsap mask

diagnostic | dsm | etype-6000 | etype-8042 | lat

mumps | netbios | vines-echo |vines-ip |

xns-idp | 0-65535] [cos cos]

In extended MAC access-list configuration mode, specify to

permit or deny any source MAC address, a source MAC address

with a mask, or a specific host source MAC address and any

destination MAC address, destination MAC address with a mask,

or a specific destination MAC address.

(Optional) You can also enter these options:

• type mask—An arbitrary EtherType number of a packet with

Ethernet II or SNAP encapsulation in decimal, hexadecimal,

or octal with optional mask of don’t care bits applied to the

EtherType before testing for a match.

• lsap lsap mask—An LSAP number of a packet with

IEEE 802.2 encapsulation in decimal, hexadecimal, or octal

with optional mask of don’t care bits.

| xns-idp—A non-IP protocol.

• cos cos—An IEEE 802.1Q cost of service number from 0 to 7

used to set priority.

Step 4 end Return to privileged EXEC mode.

Step 5 show access-lists [number | name]Show the access list configuration.

Step 6 copy running-config startup-config (Optional) Save your entries in the configuration file.

Command Purpose