Acls And Bridged Packets - Cisco WS-C3550-12G Software Configuration Manual

Chapter 19 Configuring Network Security with ACLs
Using VLAN Maps with Router ACLs

ACLs and Bridged Packets

Figure 19-7 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 19-7 Applying ACLs on Bridged Packets
Catalyst 3550 switch
with enhanced
multilayer software image
VLAN 10 VLAN 20
map map
Frame
Host A Host B
(VLAN 10) (VLAN 20)
Fallback bridge
VLAN 10 VLAN 20
Packet
Catalyst 3550 Multilayer Switch Software Configuration Guide
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