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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring Network Security with ACLs
Using VLAN Maps with Router ACLs
Figure 1-6 Applying ACLs on Switched Packets
ACLs and Bridged Packets
Figure 1-7 shows how an ACL is applied on fallback-bridged packets. For bridged packets, only Layer 2
ACLs are applied to the input VLAN. Only non-IP, non-ARP packets can be fallback-bridged.
Figure 1-7 Applying ACLs on Bridged Packets
VLAN 10
map
Frame
Input
router
ACL
Output
router
ACL
Routing function or
fallback bridge
VLAN 10 VLAN 20
Host C
(VLAN 10)
Host A
(VLAN 10)
VLAN 20
map
Packet
101357
Frame
Fallback bridge
VLAN 10
Host A
(VLAN 10)
Packet
101358
VLAN 20
Host B
(VLAN 20)
VLAN 10
map
VLAN 20
map
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