Cisco Systems 3750E manual Applying a MAC ACL to a Layer 2 Interface, 34-28

Chapter 34 Configuring Network Security with ACLs

Creating Named MAC Extended ACLs

	Command	Purpose
Step 3 {deny permit} {any host source MAC		In extended MAC access-list configuration mode, specify to
	address source MAC address mask} {any	permit or deny any source MAC address, a source MAC address
	host destination MAC address destination	with a mask, or a specific host source MAC address and any
	MAC address mask} [type mask lsap lsap mask	destination MAC address, destination MAC address with a mask,
	aarp amber dec-spanning decnet-iv	or a specific destination MAC address.
	diagnostic dsm etype-6000 etype-8042 lat	(Optional) You can also enter these options:
	lavc-sca mop-console mop-dump msdos	• type mask—An arbitrary EtherType number of a packet with
	mumps netbios vines-echo vines-ip
	xns-idp 0-65535] [cos cos]	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.
		• aarp amber dec-spanning decnet-iv diagnostic dsm
		etype-6000 etype-8042 lat lavc-sca mop-console
		mop-dump msdos mumps netbios vines-echo vines-ip
		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.

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.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
34-28	OL-9775-02