meter-problem access-list Inbound permit icmp any any object-group ICMP-Types access-group Inbound in interface outside ACLs in Multilayer Switches Multilayer switches, by nature of their design, allow for some security features not available on Layer-2 switches or routers. The 3750 switch supports IP ACLs and Ethernet (MAC) ACLs. Access lists on a 3750 switch can be applied in the following ways: Port ACLs Port ACLs are applied to Layer-2 interfaces on the switch. They cannot be applied to EtherChannels, SVIs, or any other virtual interfaces. Port ACLs can be applied to trunk interfaces, in which case they will filter every VLAN in the trunk. Standard IP, extended IP, and MAC ACLs can be assigned as port ACLs. Port ACLs can be applied only in the inbound direction. Router ACLs Router ACLs are applied to Layer-3 interfaces on the switch. SVIs, Layer-3 physical interfaces (configured with no switchport, for example), and Layer-3 EtherChannels can have router ACLs applied to them. Standard IP and extended IP ACLs can be assigned as router ACLs, while MAC ACLs cannot. Router ACLs can be applied in both inbound and outbound directions. VLAN maps VLAN maps are similar in design to route maps. They are assigned to VLANs, and can be configured to pass or drop packets based on a number of tests. VLAN maps control all traffic routed into, out of, or within a VLAN. They have no direction. Configuring Port ACLs Port ACLs are ACLs attached to a specific physical interface. Port ACLs can be used to deny a host within a VLAN access to any other host within the VLAN. They can also be used to limit access outside the VLAN. Imagine that VLAN 100 has many hosts in it, including host A. Host A should not be able to communicate directly with any other host within the same VLAN; it should be ACLs in Multilayer Switches able to communicate only with the default gateway, to communicate with the rest of the world. Assume that host A's IP address is 192.168.1.155/24; the default gateway's IP address is 192.168.1.1/24; and host A is conne