37-2
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 37 Configuring IPv6 ACLs
Understanding IPv6 ACLs
Understanding IPv6 ACLs
A switch running the metro IP access image 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 routed IPv6 packets.
• IPv6 port ACLs are supported only on inbound traffic on Layer 2 interfaces. IPv6 port ACLs are
applied to all IPv6 packets entering the interface.
The switch does not support VLAN ACLs (VLAN maps) for IPv6 traffic.
If you configure unsupported IPv6 ACLs, an error message appears, and the configuration does not take
affect.
Note For more information about IPv4 ACL support on the switch, see Chapter 31, “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.
Note If any port ACL (IPv4, IPv6, or MAC) is applied to an interface, that port ACL filters 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 37-2
• IPv6 ACL Limitations, page 37-3
Supported ACL Features
IPv6 ACLs on the switch have these characteristics:
• Fragmented frames (the fragments keyword as in IPv4) are supported.
• The same statistics supported in IPv4 are supported for IPv6 ACLs.
• If the switch runs out of hardware space, packets associated with the ACL are forwarded to the CPU,
and the ACLs are applied in software.
• Routed or bridged packets with hop-by-hop options have IPv6 ACLs applied in software.
• Logging is supported for router ACLs, but not for port ACLs.
• The switch supports IPv6 address-matching for a full range of prefix-lengths.
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