Information About Configuring IPv6 ACLs
You can filter IP version 6 (IPv6) traffic by creating IPv6 access control lists (ACLs) and applying them to interfaces similarly to the way that you create and apply IP version 4(IPv4) named ACLs.
Understanding IPv6 ACLs
A switch image supports the following types of IPv6 ACLs:
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IPv6 port ACLs - Supported on inbound traffic on Layer 2 interfaces only. Applied to all IPv6 packets entering the interface.
Note |
If you configure unsupported IPv6 ACLs, an error message appears and the configuration does not take affect. |
The switch does not support VLAN ACLs (VLAN maps) for IPv6 traffic.
You can apply both IPv4 and IPv6 ACLs to an interface.
Supported ACL Features
IPv6 ACLs on the switch have these characteristics:
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Fragmented frames (the fragments keyword as in IPv4) are supported.
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The same statistics supported in IPv4 are supported for IPv6 ACLs.
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If the switch runs out of TCAM space, packets associated with the ACL label are forwarded to the CPU, and the ACLs are applied in software.
IPv6 ACL Limitations
With IPv4, you can configure standard and extended numbered IP ACLs, named IP ACLs, and MAC ACLs. IPv6 supports only named ACLs.
The switch supports most Cisco IOS-supported IPv6 ACLs with some exceptions:
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The switch does not support matching on these keywords: flowlabel, routing header, and undetermined-transport.
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The switch does not support reflexive ACLs (the reflect keyword).
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This release supports only port ACLs for IPv6; it does not support router ACLs for IPv6 and VLAN ACLs (VLAN maps).
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The switch does not apply MAC-based ACLs on IPv6 frames.
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You cannot apply IPv6 port ACLs to Layer 2 EtherChannels.
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The switch does not support output port ACLs.
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When configuring an ACL, there is no restriction on keywords entered in the ACL, regardless of whether or not they are supported on the platform. When you apply the ACL to an interface that requires hardware forwarding (physical ports), the switch checks to determine whether or not the ACL can be supported on the interface. If not, attaching the ACL is rejected.
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If an ACL is applied to an interface and you attempt to add an access control entry (ACE) with an unsupported keyword, the switch does not allow the ACE to be added to the ACL that is currently attached to the interface.