Cisco Systems 3750E manual Understanding IPv6 ACLs, 35-2

Chapter 35 Configuring IPv6 ACLs

Understanding IPv6 ACLs

Understanding IPv6 ACLs

Note

Note

Note

A switch running the advanced IP services feature set supports two types of IPv6 ACLs:

•IPv6 router ACLs are supported on outbound or inbound traffic on Layer 3 interfaces, which can be routed ports, switch virtual interfaces (SVIs), or Layer 3 EtherChannels. IPv6 router ACLs apply only to IPv6 packets that are routed.

•IPv6 port ACLs are supported on inbound traffic on Layer 2 interfaces only. IPv6 port ACLs are applied to all IPv6 packets entering the interface.

A switch running the IP services or IP base feature set supports only input router IPv6 ACLs. It does not support port ACLs or output IPv6 router ACLs.

If you configure unsupported IPv6 ACLs, an error message appears and the configuration does not take affect.

On a switch running the IP base or IP services features set, if you create or apply an output router ACL or an input port ACL, the ACL is added to the switch configuration but does not take effect; an error message appears. If you want to use the output router ACL or input port ACL, save the switch configuration and enable the advanced IP services feature set, which supports the ACL.

The switch does not support VLAN ACLs (VLAN maps) for IPv6 traffic.

For more information about ACL support on the switch, see Chapter 34, “Configuring Network Security with ACLs.”

You can apply both IPv4 and IPv6 ACLs to an interface.

As with IPv4 ACLs, IPv6 port ACLs take precedence over router ACLs:

•When an input router ACL and input port ACL exist in an SVI, packets received on ports to which a port ACL is applied are filtered by the port ACL. Routed IP packets received on other ports are filtered by the router ACL. Other packets are not filtered.

•When an output router ACL and input port ACL exist in an SVI, packets received on the ports to which a port ACL is applied are filtered by the port ACL. Outgoing routed IPv6 packets are filtered by the router ACL. Other packets are not filtered.

If any port ACL (IPv4, IPv6, or MAC) is applied to an interface, that port ACL is used to filter packets, and any router ACLs attached to the SVI of the port VLAN are ignored.

These sections describe some characteristics of IPv6 ACLs on the switch:

•Supported ACL Features, page 35-3

•IPv6 ACL Limitations, page 35-3

•IPv6 ACLs and Switch Stacks, page 35-3

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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