First time I heard about VLAN Access Lists (VACLs) I was pretty intimidated. What's this access-list that can affect traffic at the L2 level? Must be pretty fancy, huh? Turns out not so fancy.
The problem:
Under normal operations, ACLs can only filter traffic at L3 (i.e. they have to be applied to an interface in a specific direction.
The solution:
VACLs use ACLs too, but they stand on the powerful shoulders of the Access-Map format (Route-Map-Looking statements).
Configuration Steps
Warning:Note that there may be a need to apply another ACL in the other direction (denying traffic from 192.168.2.0/24). In this case, just add that line in the ACL and, since it's already applied, no need to modify the VLAN access-map.
Although I wouldn't recommend filtering at this level in a large enterprise, this tool could be useful for smaller shops without a internal firewalls but with a need to segregate traffic. So go have fun!
The problem:
Under normal operations, ACLs can only filter traffic at L3 (i.e. they have to be applied to an interface in a specific direction.
The solution:
VACLs use ACLs too, but they stand on the powerful shoulders of the Access-Map format (Route-Map-Looking statements).
Configuration Steps
- Create an ACL
- Create a VLAN access-map and specify an action
- Apply the access-map to a SVI
Configuration commands:
ip access-list extended vacl_testpermit ip host 10.1.1.1 192.168.2.0 0.0.0.255exit!vlan access-map vacl_test_mapmatch ip address list vact_testaction dropvlan access-map vacl_test_map 20 (the 20's just a sequence number)action forwardexit!vlan filter vacl_test_map vlan-list 1Warning:Note that there may be a need to apply another ACL in the other direction (denying traffic from 192.168.2.0/24). In this case, just add that line in the ACL and, since it's already applied, no need to modify the VLAN access-map.
Although I wouldn't recommend filtering at this level in a large enterprise, this tool could be useful for smaller shops without a internal firewalls but with a need to segregate traffic. So go have fun!
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