Example: ACLs and Routed Packets
This example shows how ACLs are applied on routed packets. The ACLs are applied in this order:
1
VLAN map for input VLAN
2
Input router ACL
3
Output router ACL
4
VLAN map for output VLAN
Figure 11: Applying ACLs on Routed Packets
Example: ACLs and Multicast Packets
This example shows how ACLs are applied on packets that are replicated for IP multicasting. A multicast
packet being routed has two different kinds of filters applied: one for destinations that are other ports in the
input VLAN and another for each of the destinations that are in other VLANs to which the packet has been
routed. The packet might be routed to more than one output VLAN, in which case a different router output
ACL and VLAN map would apply for each destination VLAN. The final result is that the packet might be
permitted in some of the output VLANs and not in others. A copy of the packet is forwarded to those
destinations where it is permitted. However, if the input VLAN map drops the packet, no destination receives
a copy of the packet.
Catalyst 2960-X Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX
OL-29048-01 193
Configuring IPv4 ACLs
Configuration Examples of Router ACLs and VLAN Maps Applied to VLANs
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