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routing-lab/lab001-openbgpd-ebgp/README.md

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Lab 1: eBGP Routing With OpenBGPD

Network Architecture

  • There are 3 AS: AS23, AS42 and AS1337
  • Each pair of AS' has its own direct interconnect in a dedicated docker network.
    • The IP range used in each interconnect is fd00:d0ca:<ASN1><ASN2>:1::/64, where AS1337 uses 13 instead.

eBGP

  • Each AS runs an OpenBGPD router for eBGP peering.
  • An alice-lg looking class connecting to all 3 BGP routers is started on http://localhost:7340.
  • Each AS announces the fd00:d0ca:<ASN>:1::/64 prefix.

Example: traceroute from AS42 eBGP router to AS23 eBGP router: When the link is taken offline, the traffic is routed via AS1337 instead:

$ docker exec -it lab001-openbgpd-ebgp-as42-1 /bin/sh
/ # traceroute -n fd00:d0ca:23:1::10
traceroute to fd00:d0ca:23:1::10 (fd00:d0ca:23:1::10), 30 hops max, 72 byte packets
 1  fd00:d0ca:23:1::10  0.019 ms  0.021 ms  0.016 ms
/ # bgpctl neigh as23_1 down
request processed
/ # traceroute -n fd00:d0ca:23:1::10
traceroute to fd00:d0ca:23:1::10 (fd00:d0ca:23:1::10), 30 hops max, 72 byte packets
 1  fd00:d0ca:4213:1::1337  0.019 ms  0.019 ms  0.017 ms
 2  fd00:d0ca:23:1::10  0.015 ms  0.019 ms  0.017 ms
/ # bgpctl neigh as23_1 up
request processed
/ # traceroute -n fd00:d0ca:23:1::10
traceroute to fd00:d0ca:23:1::10 (fd00:d0ca:23:1::10), 30 hops max, 72 byte packets
 1  fd00:d0ca:23:1::10  0.019 ms  0.021 ms  0.016 ms