Michal c729275961 labsim: add IPv6 BGP config layer for the Gateway-API public-v6 rehearsal ...

The sim's eBGP was IPv4-only; extend it to the v6 family so labsim can rehearse
Cilium BGP advertising a public-style v6 LoadBalancer /64 to the VyOS pair before
it touches production (approved plan: public IPv6 via Cilium BGP + Gateway API).

- sim-net-config.py: bgp6 inside bgp() -- ipv6-unicast peer-group K8S6 over
  fd00:2::11/12/13, prefix-list6 (le 128, /128 host routes), K8S-IN6/OUT6 route-maps
  (export deny -- never hand the cluster a default). ULA fd61:1e00::/64 as the sim
  LB range so nothing leaks into the real HE /48. All v6 lines pass the
  sim-net-apply.sh whitelist.
- sim-ha-config.py: VLANS6 = {2: fd00:2/64} -> routers hold fd00:2::252/253 on
  bond0.2 so they can peer the nodes over v6 (no v6 VRRP VIP; BGP peers the per-box
  address, as production).
- k8s-up.sh: nodes get fd00:2::11/12/13 + dual-stack k3s (dual node-ip, dual
  cluster/service CIDR). Peers line up with sim-net-config K8S_NODES_V6.

Config-gen verified for all three. Live chunk (Cilium v6+BGP+Gateway install,
bring-up, datapath/#26847 proof) is next.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DMVzWZgiKW2wquf5z8S1yH

2026-09-10 01:23:03 +01:00

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