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32-3
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 32 IPv6 Support on the Cisco ASR 901 Router
Information About IPv6 Support on the Cisco ASR 901 Router
Benefits
IPv6 Support on the Cisco ASR 901 router provides the following benefits:
• Supports state-less auto-configuration of IPv6 addresses.
• Supports the following routing protocols:
–
Static routing
–
Open Shortest Path First (OSPF) version 3
–
Border Gateway Protocol
–
Intermediate System-to-Intermediate System (IS-IS)
Overview of IPv6
IPv6 is the latest version of the Internet Protocol that has a much larger address space and improvements
such as a simplified main header and extension headers. The architecture of IPv6 has been designed to
allow existing IPv4 users to transition easily to IPv6 while providing services such as end-to-end
security, quality of service (QoS), and globally unique addresses.
The larger IPv6 address space allows networks to scale and provide global reachability. The simplified
IPv6 packet header format handles packets more efficiently. IPv6 supports widely deployed routing
protocols such as Routing Information Protocol (RIP), Integrated Intermediate System-to-Intermediate
System (IS-IS), Open Shortest Path First (OSPF) for IPv6, and multiprotocol Border Gateway Protocol
(BGP). Other available features include stateless autoconfiguration and enhanced support for Mobile
IPv6.
IPv6 is being introduced on the Cisco ASR 901 router to support Long Term Evolution (LTE) rollouts
that provides high-bandwidth data connection for mobile wireless devices. The IPv6 transport utilizes
Switch Virtual Interface (SVI) and Ethernet interfaces. The Cisco ASR 901 router also supports IPv6
addressing on Loopback interfaces.
IPv6 Address Formats
IPv6 addresses are represented as a series of 16-bit hexadecimal fields separated by colons (:) in the
format: x:x:x:x:x:x:x:x. Following are two examples of IPv6 addresses:
2001:DB8:7654:3210:FEDC:BA98:7654:3210
2001:DB8:0:0:8:800:200C:417A
It is common for IPv6 addresses to contain successive hexadecimal fields of zeros. To make IPv6
addresses less complicated, two colons (::) may be used to compress successive hexadecimal fields of
zeros at the beginning, middle, or end of an IPv6 address (the colons represent successive hexadecimal
fields of zeros). Table 32-1 lists compressed IPv6 address formats.
A double colon may be used as part of the ipv6-address argument when consecutive 16-bit values are
denoted as zero. You can configure multiple IPv6 addresses per interface, but only one link-local
address.
Note Two colons (::) can be used only once in an IPv6 address to represent the longest successive hexadecimal
fields of zeros. The hexadecimal letters in IPv6 addresses are not case-sensitive.