IPv6 on vBNS

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IPv6 on vBNS

• Greg Miller
• NANOG - Albuquerque, NM
• June 12, 2000
• http//www.vbns.net

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vBNS Overview

• High-Performance Backbone for RE community
  sponsored by U.S. NSF.
• Charter foster research and education develop
  and offer advanced services
• high-bandwidth IPv4 (1st OC-3 backbone in US)
• native IP multicast
• native IPv6
• IP QoS
• traffic measurement and analysis

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vBNS Evolution

• The vBNS was built in 1995 as an OC-3 IP-over-ATM
  backbone.
• Initially interconnected 5 NSF-funded
  supercomputer centers.
• User community grew to include top 100 U.S. RE
  institutions by mid-1998.
• Strong relationships and peering with many
  international RE networks.
• Adopted as the initial Internet2 backbone.

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The vBNS Today

• Dual technology backbone OC-12 ATM and
  OC-12/OC-48 POS trunks.
• Multi-vendor backbone Cisco Juniper.
• MPLS deployed in March 2000.
• End of NSF funding in April 2000.
• Three-year, no-cost extension of contract.
• vBNS commercialization and expansion of user
  community to include corporate RD labs, govt
  agencies, education, ...

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vBNS IPv6 Service Overview

• Native (not tunneled) IPv6-over-ATM on the vBNS
  backbone since July 1998.
• Dedicated hardware (Cisco 4700s with OC3/ATM) for
  IPv6 routing.
• Full mesh of PVCs among the IPv6 routers.
• Native and tunneled connections to vBNS-attached
  institutions.
• Backbone provider (pTLA) for the global 6bone.

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vBNS IPv6 Router Locations
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vBNS POP Architecture
vBNS Backbone
OC48c
Juniper M40
OC12mon
OC12c
OC12c
T1 through OC12c ports for ATM network service
access
T1 through OC12c ports for private-line access
Fore ASX-1000 ATM switch
o o o
o o o
OC3c
OC12c
OC3c
Cisco 7507 (IPv4)
Sun Ultra2
Cisco 4700 (IPv6)
Management Ethernet
mgt router
Management IP network
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vBNS IPv6 Service Details

• IPv6 routers fully meshed with ATM PVCs.
• RIPng is the IGP. -(
• BGP4 peering with other 6bone sites.
• Static routes or BGP4 peering with vBNS-attached
  institutions.
• Most connections are native (over ATM), with some
  IPv6-over-IPv4 tunnels.
• DNS supports AAAA and PTR records.
• IPv6-capable web server www.vbns.net

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IPv6 Trunking Details
vBNS POP
Cisco 4700 (IPv6)
vBNS POP
Cisco 4700 (IPv6)
Juniper M40
ATM switch
Juniper M40
ATM switch
native IPv6 PVCs
tunnel
vBNS ATM Backbone
customer IPv4 router
customer IPv6 router
customer IPv6 router
tunneled customer
Juniper M40
ATM switch
native customer
Cisco 4700 (IPv6)
vBNS POP
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Trunking IPv6 Over MPLS
vBNS POP
vBNS POP
Cisco 4700 (IPv6)
Cisco 4700 (IPv6)
Juniper M40
ATM switch
Juniper M40
ATM switch
native IPv6 LSPs
tunnel
vBNS MPLS Backbone
customer IPv4 router
customer IPv6 router
customer IPv6 router
tunneled customer
Juniper M40
ATM switch
native customer
Cisco 4700 (IPv6)
vBNS POP
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Address Delegation

• Two types of connections offered
• transit site
• offers connectivity and aggregation for other
  sites that are topologically behind it
• is delegated a /32 address block to number its
  own site and those behind it
• leaf site
• stub site that does not offer transit to other
  sites
• is delegated a /48 address block to number the
  site
• Try to follow topological hierarchy
• good testbed for multihoming issues

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vBNS IPv6 Address Assignment
6bone Address Format
64 bits
16 bits
24 bits
24 bits
NLA2
SLA
pTLA
Interface ID
0x3FFE
8 bits
vBNS Address Format
64 bits
16 bits
24 bits
24 bits
0x3FFE
0x28
SLA
Interface ID
NLA2 Site ID
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8
16 bits
vBNS leaf sites are assigned a Site ID under
NLA20xFF
vBNS transit sites are assigned an NLA2
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vBNS IPv6 Logical Network Map
Texas AP
Moscow State Univ
6TAP
SUNY- Buffalo
VA Tech
Chicago
MIT
San Francisco
Perryman, MD
ODU
San Diego
PSC
UVA
SDSC
PSU
SoX/ GA Tech
UCSD
vBNS POP pTLA Transit Site Exchange Point
Leaf Site native tunnel

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vBNS IPv6 Routing Policy

• We provide transit for IPv6.
• We enforce 6Bone Routing Practice ID
  recommendations
• For peering sessions with other pTLAs
• accept only /24s (except ours), /28s, /35s
• announce only /24s (including ours), /28s,
  /35s
• For Leaf and Transit sites
• accept only delegated prefix (/32 or /48)
• announce everything

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Commercializing the IPv6 Service vBNS

• IPv6 service is bundled with vBNS subscription.
  No additional charge.
• Quasi-production - experimentation is
  encouraged.
• Not restricted by an Authorized Use Policy.
• vBNS has been delegated production IPv6 address
  space (a sub-TLA) from ARIN.
• Renumbering is underway in the backbone.
• Address space to be delegated to customers.

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Areas for future work

• Experimentation with transition mechanisms
  (6over4, 6to4, etc.).
• Better integration of v4 and v6.
• Trunking IPv6 over MPLS rather than ATM.
• Test new stuff OSPFv6, A6 records, . . .
• Need more applications
• IRC, WWW content, napster, gnutella???
• multiplayer game contests?

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Why are we doing this?

• It falls under our charter.
• Competitive edge.
• Community service - to help advance the
  development of the technology.
• Unfortunately, not because customers are asking
  us for it (although a few are).
• If we build it, will they come?