Pv6 Planning and Implementation

Tata Communications IPv6 planning and implementation had a strong head start through the knowledge and the operational service acquired through Teleglobe.

Teleglobe was an early promoter of IPv6. As a member of the Canadian Research and Education (CA*net4) network Technical Advisory Board, collaborating with CANARIE, Inc. (http://www.canarie.ca/) who manages CA*net4, Teleglobe supported the development of 6TAP (http://www.6tap.net/) in Chicago, a native IPv6 peering point cofunded by CANARIE, Inc. and ESnet (http:// www.es.net/). The 6TAP peering router was a Cisco 7206 router running an initial prototype of Cisco IOS IPv6 code. Teleglobe hosted the first IPv6 node for Surfnet

(http://www.surfnet.nl/en), the Netherlands National Research and Education (NREN) network, connected to the Chicago 6TAP located at The Science, Technology, And Research Transit Access Point, or STAR TAP (http:// www.startap.net/startap/). The infrastructure is depicted in Figure 5-4.

Figure 5-4 Tata Communications IPv6 Test Network in 2000

Figure 5-4 Tata Communications IPv6 Test Network in 2000

Teleglobe facilitated the world's first intercontinental native IPv6 connection in 1998 between the Communications Research Centre (CRC) in Ottawa and Berkom in Berlin. It also took an active role in promoting and championing IPv6. Teleglobe became a founding member of the IPv6 Forum in 1999.

At the March 2000 Telluride IPv6 Forum meeting, Teleglobe presented its initial IPv6 service plans, and in 2003 it provided an initial IPv6 service based on the Hexago tunnel broker transition mechanism. This initial offering was followed by a gradual deployment of IPv6 over MPLS using the Cisco 6PE feature, which became RFC 4798 in January 2007. The production-level, high-performance service was introduced in January 2004. It is important to note that while other IPv6 service announcements at that time, triggered by DoD's mandate, were typically tunnel based, Teleglobe's service was based on a scalable highperformance integration mechanism.

Starting with the original Teleglobe infrastructure, Tata Communications continues to expand the IPv6 coverage across its network in a dual-stack approach.

The deployment of a full dual-stack network, core and access, has accelerated in 2006, facilitated by the current phase of high growth in Internet traffic, due essentially to the user-generated-content phenomenon driven by applications such as YouTube and MySpace. This traffic growth, although essentially IPv4 in nature, provided a sufficient business case for upgrading the network with new, top of the line interface cards. The line cards were selected so that they also support IPv6 hardware acceleration, which enables Tata Communications network to deliver high-performance, scalable IPv6 services.

NOTE From a technical perspective, the integration of IPv6 has the following characteristics:

• For AS6453: The global network evolved from a 6PE environment to a dual-stack network, including core. Native IPv6 peering has been established with major Tier 1 and Tier 2 providers. Peering is through public peering (dedicated for IPv6 or dualstack) or private dual-stack peering.

• For AS4755: For the domestic IP network in India covering more than 120 cities, Tata Communications decided to leverage existent MPLS cores to deliver IPv6 connectivity with the help of 6PE, similar to Teleglobe's early approach in AS6453. It is also deploying a dual-stack network where the Interior Gateway Protocol (IGP) selected is multitopology Intermediate System-to-Intermediate System (IS-IS). The addressing scheme allocates a /44 per POP with a /48 reserved for infrastructure purposes and a /56 allocated per router. Customer allocations are /48 or longer. A detailed analysis of the scalability requirements of this design was performed for all platforms in its network. The edge routers (Metro Ethernet POPs and PE routers) are dual-stack routers and the IGP used is OSPF. The IPv6 addressing scheme in this part of the network takes a hierarchical approach with a /40 allocated per region. The AS4755 network consists of eight regions within India converging into eight Tier 1 POPs. The /40 per region is further subdivided into /44s and allocated to the Tier 2 and Tier 3 POPs that in turn converge into the regional Tier 1 POPs.

Table 5-13 summarizes Tata Communications phased approach to IPv6 deployment.

Table 5-13 Tata Communications' Strategy for Deploying IPv6

Phase 1 (1998-2004)

Phase 2 (2005-2008)

Phase 3

(2008 Onward)

1998: Teleglobe is involved with the IPv6 research networks supporting 6TAP. Teleglobe provides dedicated links for IPv6 connectivity. 1999: Teleglobe is a founder of the IPv6 Forum. 2003: Teleglobe provides initial service based on Hexgao tunnel broker. 2004: Teleglobe announces full IPv6 service based on Cisco 6PE.

Performed a detailed inventory of the hardware and software deployed in the network. Memory requirements, hardware forwarding of IPv6, and scalability capabilities of devices and line cards were evaluated for the two major vendors deployed in the network: Cisco and Juniper. 2006: Network upgrade driven by IPv4 bandwidth requirements leads to an IPv6-capable infrastructure. Both core and access layers are enabled for dual-stack, IPv4/IPv6.

In areas operating around an MPLS core, IPv6 services are deployed using 6PE.

Dual-stack, core and access. IPv6 support mandatory for NGN deployment in the context of IP convergence. Generalized IPv6 support for enterprise markets.

NOTE Teleglobe acquired its first IPv6 prefix from ARIN on March 5,

2003: 2001:5A0::/32. In the meantime, given the global nature of its network (AS6453), Teleglobe obtained an IPv6 prefix from APNIC, 2405:2000::/32, one from AfriNIC, 2001:42c8::/32, and one from RIPE NCC, 2a01:3e0::/32.

For the domestic network in India (AS4755), Tata Communications IP was allocated prefix 2403::/32 by APNIC while for the domestic network in South Africa (AS36937), Neotel was allocated prefix 2001:42a8::/32 by AfriNIC.

Figure 5-5 shows the current options available to Tata Communications customers to connect via IPv6.

Figure 5-5 shows the current options available to Tata Communications customers to connect via IPv6.

Figure 5-5 IPv6 Access Options for Tata Communications Customers

As of June 2007, approximately 85 percent of the network is fully dual-stack enabled. The Indian domestic IP network will be IPv6-enabled based on 6PE starting with all major cities on the network and expanding coverage based on demand. Deployment has started in August 2007 with Mumbai, Pune, Bangalore, Chennai, Hyderabad, Ahmedabad, Kolkata, and Delhi and a further extensions to Tier-1 and Tier-2 cities are scheduled to be turned up in the near future. Tata Communications South African network, Neotel, will also provide dual-stack IPv4 and IPv6 services as the deployment of the network progresses. Teleglobe's legacy tunnel-based service will be maintained.

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