A Simple BGP-based Mobile Routing System for the Aeronautical Telecommunications Network Fred L. Templin (fltemplin@acm.org) IETF101 Routing Working Group.

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Presentation transcript:

A Simple BGP-based Mobile Routing System for the Aeronautical Telecommunications Network Fred L. Templin (fltemplin@acm.org) IETF101 Routing Working Group (rtgwg) March 22, 2018

Background International Civil Aviation Organization (ICAO) building an IP-based networking system for worldwide Air Traffic Management (ATM) Developing the Aeronautical Telecommunications Network with Internet Protocol Services (ATN/IPS) Under development in ICAO Working Group I (WG-I) IPv6-based; mobility capable Accommodates aircraft with multiple data links SATCOM LDACS VHF etc.

ICAO Mobility Subgroup Solution Discussion Looking at three candidate mobility solutions: MIPv6/PMIPv6 Ground-based LISP BGP-based overlay (subject of this document) “A Simple BGP-Based Mobile Routing System for the Aeronautical Telecommunications Network” BGP overlay network – separate from the global public Internet BGP routing system Based on a “hub and spokes” arrangement with regionally distributed stub ASBRs and centrally located core ASBRs s-ASBRs advertise; withdraw airplane Mobile Network Prefixes (MNPs) c-ASBRs in a hub AS forward packets between s-ASBRs Proxys connect data link subnetworks to the overlay Clients are aircraft that may connect to multiple subnetworks Route optimization removes ASBRs from path

ATN/IPS With BGP Subnetworks connect airplanes Clients Subnetwork Subnetwork Proxy Proxy Subnetwork Subnetwork Proxy c-ASBRs Proxy s-ASBRs Internetwork Subnetwork Proxy Proxy Subnetworks connect airplanes Internetwork conn. subnetworks Native IPv6 within subnetwork Tunneled IPv6 across Internetwork Subnetwork

BGP Details Each s-ASBR is a stub AS unto itself All c-ASBRs members of the same core AS s-ASBRs advertise their associated MNPs to c-ASBRs using eBGP c-ASBRs originate “default”, but DO NOT advertise any MNPs to s- ASBRs c-ASBRs discover all MNPs in the system using iBGP c-ASBRs can connect the overlay to the global public Internet, in which case they would advertise short and unchanging aggregates (e.g., 2001:db8::/32) instead of dynamically changing more-specifics (e.g., 2001:db8:1:2::/64)

Route Optimization Destination Source NA NS Clients Subnetwork Subnetwork Source Proxy Proxy Subnetwork Subnetwork NA Proxy NS Proxy Initial packets go from Proxy through source and target s-ASBRs as well as any c-ASBRs Proxy sends NS to get an NA back from the target s-ASBR Future packets go directly from source Proxy to target Proxy s-ASBRs Subnetwork Proxy Proxy Subnetwork

Draft Status https://datatracker.ietf.org/doc/html/draft-templin-atn-bgp Draft presented at ICAO WG-I mobility subgroup; under active consideration there as mobility solution candidate Identify IETF working group Questions?