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Restrictions for IPv6 RA Guard

• The IPv6 RA Guard feature does not offer protection in environments where IPv6 traffic is tunneled.
• This feature is supported only in hardware when the ternary content addressable memory (TCAM) is programmed.
• This feature can be configured on a switch port interface in the ingress direction.
• This feature supports host mode and router mode.
• This feature is supported only in the ingress direction; it is not supported in the egress direction.
• This feature is not supported on EtherChannel and EtherChannel port members.
• This feature is not supported on trunk ports with merge mode.
• This feature is supported on auxiliary VLANs and private VLANs (PVLANs). In the case of PVLANs, primary VLAN features are inherited and merged with port features.
• Packets dropped by the IPv6 RA Guard feature can be spanned.

The ―summary-address‖ is only used to create aggregate addresses for OSPF at an autonomous system boundary. It means this command should only be used on the ASBR when you are trying to summarize externally redistributed routes from another protocol domain or you have a NSSA area. But a requirement to create a summarized route is:

―The ASBR compares the summary route’s range of addresses with all routes redistributed into OSPF on that ASBR to find any subordinate subnets (subnets that sit inside the summary route range). If at least one subordinate subnet exists, the ASBR advertises the summary route.‖