routing-lab/README.md

routing-lab

Hi, this is me getting some hands-on experience with routing protocols by building a small docker-compose based lab environment.

Important

This lab environment uses IPv6 exclusively. IPv6 support must be enabled in Docker beforehand!

Network Architecture

• There are 3 AS: AS23, AS42 and AS1337
• Each pair of AS' has its own direct interconnect in a dedicated docker network.
  • Exception: There are two AS23-AS42 interconnects, each in its own docker network.
  • The IP range used in each interconnect is fd00:d0ca:<ASN1><ASN2>:<IC#>::/64, where AS1337 uses 13 instead. <IC#> is the interconnect ID (as there's tw between AS23 and AS42).

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:

routing-lab-as42-1:/ # traceroute 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 (fd00:d0ca:23:1::10)  0.022 ms  0.016 ms  0.014 ms
routing-lab-as42-1:/ # bgpctl -s /run/bgpd.sock.42 neigh as23_1 down
request processed
routing-lab-as42-1:/ # traceroute fd00:d0ca:23:1::10
traceroute to fd00:d0ca:23:1::10 (fd00:d0ca:23:1::10), 30 hops max, 72 byte packets
 1  routing-lab-as1337-1.routing-lab_as42_as1337_1 (fd00:d0ca:4213:1::1337)  0.059 ms  0.016 ms  0.020 ms
 2  fd00:d0ca:23:1::10 (fd00:d0ca:23:1::10)  0.031 ms  0.019 ms  0.017 ms
routing-lab-as42-1:/ # bgpctl -s /run/bgpd.sock.42 neigh as23_1 up
request processed
routing-lab-as42-1:/ # traceroute 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 (fd00:d0ca:23:1::10)  0.017 ms  0.018 ms  0.018 ms