Name: Cisco Catalyst 2960-XR
Brand: Cisco
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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.

Figure 11: Applying ACLs on Multicast Packets

Catalyst 2960-XR Switch Security Configuration Guide, Cisco IOS Release 15.0(2)EX1

OL-29434-01 153

Configuring IPv4 ACLs

Configuration Examples of Router ACLs and VLAN Maps Applied to VLANs

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