6. ipv6 internetzugang für privatkunden: die lösung von swisscom - martin gysi
TRANSCRIPT
IPv6 @ Swisscom
Martin Gysi, 8.6.2011
Senior Network Development Engineer,
IPv6 Strategy Swisscom
Public
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The question „will IPv6 ever by widely deployed?“ is no longer open.The answer is a clear „yes“.
• Google, Facebook are accessible using IPv6
• Free.fr has 500„000 IPv6-enabled customers (which makes it the
largest IPv6 ISP in the world)
• Most major Telcos have stated that they are now starting to deploy
real IPv6 services. Most will do so in 2011/2012
• And yes, IPv4 addresses will become scarce real soon… But that‟s
another story…
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The driver for IPv6 is the lack of IPv4 addresses.But IPv6 does not solve the IPv4 address shortage problem
• IPv6 is not compatible to IPv4. So IPv4 must continue to be operated
• IPv4 addresses can be saved by using them more efficiently, or by deploying NAT inside the carrier„s network (NAT44, CGN). Drives complexity and costs short term fix.
• IPv6 is not the short term solution. But in the long run it„s the only way to continue the Internet as we know it today.
• IPv6 does not replace IPv4, it„s added in parallel to it „Dual Stack“
IPv4 address depletion
Short term fix:
NAT44 deployment
Medium term strategy:
IPv6 migration
Action plan:
End-to-end
IPv6 deployment
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Our IPv6 policy:We enable our customers to access the IPv6 Internet, and we offer our services to the IPv6 Internet
• External communication (aka Internet) will need IPv6 first. Gartner recommends that enterprises establish an IPv6 Internet presence in the 2012 to 2015 time frame.
• Internal networks and services can remain IPv4 on the longer term
• Swisscom is currently analyzing all its services, to identify the steps required for introducing IPv6, and is working out a detailed roll-out plan
– Entire IT tool chain: order entry, service fulfillment and assurance, billing
– Network elements (routers, firewalls, load-balancers…) and platforms
– Regulatory aspects, such as lawful intercept
– Security, both from Swisscom‟s and our customer‟s point of view
– Product integration (part of the standard offering or option, …)
– Customer experience
– Impact on operations, training of staff
• About to launch IPv6 for residential wireline Internet access:
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So, what are we doing right now?IPv6 @ Swisscom
• IP-plus backbone is fully dual-stack, IP-plus business Internet access is available with native IPv6.
• IPv6 in our mobile network. Works in the lab, are now expanding from there into the IT systems (RADIUS, User Databases (HLR), Mobile Proxy, Billing, etc.) and into the radio access network.
– The few handsets that support IPv6 cannot operate Dual Stack. IPv6 only is not interesting for most people
– LTE Rel. 8 / 3G Rel. 9 defines a Dual Stack PDP context.
– Newest chipsets support PDPv4v6, so the handset situation will improve.
• More labs for broadband access and datacenter environments. Gives those engineers and sysadmins something to learn from!
• We‟ll launch IPv6 for residential Internet access this year
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What is required for an IPv6 Internet Access Service?Complex infrastructure is barrier to cost-efficient IPv6 deployment. Legacy infrastructure cannot be upgraded easily.
End-to-end overview of Swisscom‘s Internet Access Service
network
ADSL
VDSL
ATM
native Ethernet
BRAS
3P-PE
No IPv6
support in
used mode
of operation
L2 platform,
IPv6 not
required
L2 platform,
IPv6 not
required
L2 platform,
IPv6 not required, but
scalability issues
PPP
IPoE
IPoEoA
Access Edge
ISP connectivity
Aggregation
Access Core
FTTH
L2 platform,
IPv6 not
required
Ethernet over MPLS
L2 platform, IPv6
not required
6VPE ready
BNG
IPoE
IT Systems:
DHCP, RADIUS,
LDAP
ISP core Internet peering
IPv4/IPv6
dual stack
IT Systems: Various
user/service
databases
LNS
Route
Reflector:
Required IPv6
features available
Required
IPv6
features
available
(6VPE)
P Routers:
IPv6 not
required
SSG
ISG
MPLS VPN
MP
LS
VP
N
MP
LS
VP
N
wholesale retail
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Using 6RD, IPv6 Internet access is an incremental upgrade.Production-quality IPv6 Internet access at a fraction of the costs
• No complex upgrade of infrastructure,
leverage IPv4 network to provide
IPv6 access. Simply...
– Add IPv6 and 6RD support to
customer modems
– Add 6RD Border Relays to dual-stack
portion of network
IPv4 access
network
Internet peering (dual stack)
IPv6
Internet
6RD Border
Relay
Lausanne
6RD Border
Relay Zürich
native IPv6
home network
Home network (dual stack) Swisscom Internet
Access Service
network (IPv4 only)
6RD CE
router
ADSL
VDSL
ATM
native Ethernet
BRAS
3P-PE
No IPv6
support in
used mode
of operation
L2 platform,
IPv6 not
required
L2 platform,
IPv6 not
required
L2 platform,
IPv6 not required, but
scalability issues
PPP
IPoE
IPoEoA
Access Edge
ISP connectivity
Aggregation
Access Core
FTTH
L2 platform,
IPv6 not
required
Ethernet over MPLS
L2 platform, IPv6
not required
6VPE ready
BNG
IPoE
IT Systems:
DHCP, RADIUS,
LDAP
ISP core Internet peering
IPv4/IPv6
dual stack
IT Systems: Various
user/service
databases
LNS
Route
Reflector:
Required IPv6
features available
Required
IPv6
features
available
(6VPE)
P Routers:
IPv6 not
required
SSG
ISG
MPLS VPN
MP
LS
VP
N
MP
LS
VP
N
wholesale retail
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Network
topology
6RD is a Stateless Tunnel Technology, Embedding the CE‟s IPv4 Address into the IPv6 Prefix.
IPv4
networknative
IPv6
network
native IPv6
network
6RD CE router 6RD Border Relay
0 28 60 64
subscriber subnetting
up to 32 bits of subscriber’s IPv4 address
Interface IDSubnet ID85.5.7.1712A02:1200
6RD prefix
IPv4 dest 85.5.7.171
IPv4 Header IPv6 Header
IPv6 Payloadcopy
send to preconfigured BR address send to embedded CE address
IPv6 Rapid Deployment on IPv4 Infrastructures (RFC 5969)
IPv6 address
format for 6RD
IPv4 header &
encapsulated
IPv6 packet
(downstream)
IPv6 prefix is calculated from the IPv4 address
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OSPFv3OSPFv2
6RD Border RelayImplementation Details
6RD Border Relay
Dual stack core
router
IPv4 IPv6
OSPFv3
IPv4 + IPv6
OSPFv2
6RD Border Relay
IPv4 IPv6Link failure
propagated
on both
IGPs
Link failure
not noticed in
IPv4 IGP (or
vice versa)
Router on a stick Separate IPv4
and IPv6
interface
• Cisco ASR1002-ESP10
scales up to 10 Gb/s per box (tested)
• Using anycast IPv4 address, geographically distributed scale by adding
more boxes
• Topology: “Router on a stick“
No danger of black hole routing, as IPv4 and IPv6 interface status is
inherently coupled.
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6RD CPE Routers
Implementation Details
• Vendors: Motorola, ADB Broadband (formerly Pirelli Broadband)
• 6RD parameters configured using TR-069
– Swisscom 6RD prefix and length (2a02:1200::/28)
– IPv4 bits suffix length (all 32 bits)
– 6rd Border Relay anycast IPv4 address
– Swisscom DNS servers
– IPv6 flag (enable/disable)
• IPv6 must be enabled by customer on “customer centre” website (no other changes to IT/OSS tools)
• Third-party modems (AVM Fritz Box and others) work, but need manual configuration
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• Display IPv6 check box on “customer centre” website if router supports IPv6, store IPv6 status in customer database
• Display IPv6 status to customer support, enable them to change status
• Implement new TR069 parameters for 6RD
• No other changes! No address management, no provisioning, etc!
• Separate DNS (Google white-listed) that can stop handing out AAAA records if problems with IPv6 should occur
• 6rd.swisscom.com
Implementation detailsIT aspects
IT Systems
DNS
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First deployment experiences:expect to find problems with turning on IPv6
• 2011 – the year of the MTU? Make sure Path MTU Discovery works!
– 7600 with 6748 LAN card and IOS 12.2(22)SXF10: sets IPv6 MTU
to 1486 Bytes (no matter what is configured)
– Motorola CPE (Beta version) does not do PTMUD at all…
– ASR-1k: ICMP Packet Too Big messages use final destination‟s
address as source address (not local address)
• 7600 with 12.2(33)SRE3: Buffer leak when IPv6 is enabled. Requires
periodic reboot of the box.
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Project IPv6 6rd:Phased introduction of IPv6
• Phase 0, ongoing: Internal testing and internal pilot with very friendly
customers
• Phase 1, July – September: Pilot with ~1000 customers (internal and
external)
– Dedicated team of customer support agents, trained for IPv6
• Phase 2, September – ?: Rollout of the IPv6-capable router firmware,
with IPv6 deactivated
– Customer has to active IPv6 himself on his customer portal
– Expecting slow takeup, giving us time to fix bugs and ramp up IPv6
knowledge of support personnel
• Phase 3: When we have gained enough confidence in our IPv6
capabilities: Activate IPv6 by default, by enabling it with our home
device management system.
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Swisscom will launch IPv6 for residential customers in 2011, using 6rd technology.
• 6RD changes the IPv6 “business case” from complex & expensive to
simple & cheap. There‟s no excuse for not deploying IPv6 now!
• 6RD is simple, reliable, scalable technology
– Fast prototyping thanks to Linux implementation
– Vendors engineering/beta implementations quickly available, yet
(inter-) worked flawlessly
– Tested and proven scalability
• Large-scale pilot to be started in July 2011.
– If you are a Swisscom customer and
– have a “Centro” series router, then apply!
– (Link to be published)
– Check out the “sneak preview” at http://labs.swisscom.com
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