Routing and Addressing in Next-Generation EnteRprises (RANGER) IETF 76 Routing Research Group Fred L. Templin fred.l.templin@boeing.com

RANGER Organizational Principles Recursively-nested connected local network regions joined by Enterprise Border Routers (EBRs) – a network-of-networks each distinct local network region is an “enterprise” unto itself each enterprise is (a portion of) a local routing region that provides a “commons” for tunneling between EBRs Routing scaling through separation of local addressing from global addressing example enterprises: Internet interdomain core large academic campus network corporate enterprise network ISP networks civil aviation networks Mobile Ad-hoc Networks

Internet Protocol, Version 4 (IPv4) for local routing and addressing Pouzin (1974) and Cerf (1977) proposed “CATENET Model for Internetworking” – network of networks RANGER “concatenates” enterprises into a path with recursive re-encapsulation Internet Protocol, Version 4 (IPv4) for local routing and addressing Internet Protocol, Version 6 (IPv6) for global routing and addressing Internet A RANGER Path Constructed using CATNET Principles Routing scaling through spatial reuse of local addressing (RLOCs) with mapping system for global addresses (EIDs) Global communications through recursive re-encapsulation across local routing regions (EIDs) VET and SEAL IPv4 IPv4 IPv4 IPv4 IPv4 IPv4 IPv6 IPv6

Virtual Enterprise Traversal (VET) Concerns traversal of a single enterprise within the recursive nesting “Version 2” of the Intra-Site Automatic Tunneling Addressing Protocol (ISATAP) automatic tunneling over point-to-multipoint interfaces IPv6 neighbor discovery over IPv6-in-IPv4 tunnels EBR discovery to discover exit routers that can get you off the enterprise: default routes through “default mappers” connected to provider networks more-specific routes through EBRs connected to peer networks

VET Example < Default Mappers > IPv4 network IPv6 network

Mechanisms Provider-aggregated EID addressing through PA prefix delegation (provider to customer) Provider-independent EID addressing through PI prefix registration (customer to provider) ICMP redirect from default mapper Default mappers track PA/PI prefixes through a shared mapping system Mapping system can be a local BGP instance, an enterprise naming service, etc. Default mappers without a mapping forward the *their* default mappers Default mappers in DFZ need full topology knowledge – Virtual Aggregation may help

Subnetwork Encapsulation and Adaptation Layer (SEAL) tunneling adds encapsulation overhead that reduces the path MTU as seen by the original source avoid path MTU discovery if possible due to unnecessary packet loss; black-holing due to ICMP filtering have the tunnel do transparent link-layer adaptation tunnel ingress discovers MRU of tunnel egress end result is 1500 and larger gets through

SEAL Example < Default Mappers > IPv4 network IPv6 network

Civil Aviation Example IPv6 IPv6 IPv6 Asian-Regional ANSP US-Regional ANSP European-Regional ANSP Global ATN Backbone Routing and Addressing Domain (IPv4) ATC Workstation Air Traffic Control Functional Domain Global Internet (IPv6)

“Traditional” Enterprise Example Routing & Addressing in Next Generation EnteRprises (RANGER) Network-of-networks architecture Minimal touch-points (border routers only) No changes to most hosts and routers Fully-provisioned IP services; balanced blend of tunneling, translation and native Gradual integration of IPv6 Customer-driven requirements lead policy and strategy IPv6 and IPv4 in peaceful co-existence It’s not an “either-or” decision Tangible Benefits Secure Mobile Architecture (SMA) simplified management logical partitioning traffic engineering end-to-end addressing mobility and multihoming P IPv4 Internet IPv6 Internet Enterprise Network Fully Provisioned IP Services Enterprise Network Advanced IPv6 Deployment Enterprise Network Initial IPv6 Deployment Enterprise Network IPv4-Only

Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) http://www.ietf.org/rfc/rfc5214.txt Virtual Enterprise Traversal (VET) http://tools.ietf.org/html/draft-templin-intarea-vet Subnetwork Encapsulation and Adaptation Layer (SEAL) http://tools.ietf.org/html/draft-templin-intarea-seal Routing and Addressing in Next-Generation EnteRprises (RANGER) http://tools.ietf.org/html/draft-templin-ranger RANGER Scenarios http://tools.ietf.org/html/draft-russert-rangers