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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter32 IPv6 Support on the Cisco ASR 901 Router
Prerequisites for IPv6 Support on the Cisco ASR 901 Router
Prerequisites for IPv6 Support on the Cisco ASR 901 Router
• Cisco IOS Release 15.2(2)SNG or a later IPv6-supporting release must be installed previously on
the Cisco ASR 901 Series Aggregation Services Router.
• To forward IPv6 traffic using Cisco Express Forwarding (CEF) or distributed CEF, you must
configure forwarding of IPv6 unicast datagrams globally on the router by using the
ipv6 unicast-routing command, and you must configure an IPv6 address on an interface by using
the ipv6 address command.
• You must enable CEF for IPv4 globally on the router by using the ip cef command before enabling
Cisco Express Forwarding for IPv6 globally on the router by using the ipv6 cef command.
Restrictions for IPv6 Support on the Cisco ASR 901 Router
• Switch port configuration is not supported.
• The fastethernet interface does not expect more than one IPv6 address.
• The following features are not supported:
–
Tunneling protocols such as IPv4-to-IPv6 or IPv6-to-IPv4
–
IPv6 Policy-Based Routing
–
Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP) for
IPv6
–
Quality of service (QoS) based on IPv6 addresses
–
IPv6 support of IEEE 1588v2
–
IPv6 support over slower links like time-division multiplexing (TDM) interfaces, Multilink
Point-to-Point Protocol (MLPPP), etc
–
IPv6 Access Control Lists (ACLs)
–
IPv6 over IP and Multiprotocol Label Switching (MPLS)
–
Bidirectional Forwarding Detection for IPv6 (BFDv6) for Intermediate System-to-Intermediate
System (IS-IS)
–
IPv6 Virtual Routing and Forwarding (VRF) Lite
Information About IPv6 Support on the Cisco ASR 901 Router
• Benefits
• Overview of IPv6
• IPv6 Address Formats
• IPv6 Addressing and Discovery
• Routing Protocols
• Bidirectional Forwarding Detection for IPv6
• QoS for IPv6