Access Control List Commands 4

•vid-bitmask– VLAN ID of rule must match this bitmask.•ethertype – Check the Ethernet type field.•ethertype-bitmask– Ethernet type of rule must match this bitmask.

Default Setting

None

Command Mode

MAC Mask

Command Usage

•Up to seven masks can be assigned to an ingress or egress ACL.

•Packets crossing a port are checked against all the rules in the ACL until a match is found. The order in which these packets are checked is determined by the mask, and not the order in which the ACL rules were entered.

•First create the required ACLs and inbound or outbound masks before mapping an ACL to an interface.

Example

This example shows how to create an Ingress MAC ACL and bind it to a port. You can then see that the order of the rules have been changed by the mask.

Console(config)#access-list mac M4 Console(config-mac-acl)#permit any any Console(config-mac-acl)#deny tagged-eth2 00-11-11-11-11-11

ff-ff-ff-ff-ff-ff any vid 3 Console(config-mac-acl)#end Console#show access-list MAC access-list M4:

permit any any

deny tagged-eth2 host 00-11-11-11-11-11 any vid 3 Console(config)#access-list mac mask-precedence in Console(config-mac-mask-acl)#mask pktformat ff-ff-ff-ff-ff-ff any vid Console(config-mac-mask-acl)#exit

Console(config)#interface ethernet 1/12 Console(config-if)#mac access-group M4 in Console(config-if)#end

Console#show access-list MAC access-list M4:

deny tagged-eth2 host 00-11-11-11-11-11 any vid 3 permit any any

MAC ingress mask ACL:

mask pktformat host any vid Console#

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