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Add a GRE Mesh page explaining why and how to trunk experiment VLANs across multiple minimega hosts with OVS Layer 2 GRE tunnels, including what GRE is, how to enable it, bridge scope, and physical-path MTU headroom. Link it from Experiments and Settings. Migrated from sandialabs/sceptre-phenix-docs#64. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Document GRE mesh networking
Description
The GRE mesh option appeared only in CLI help excerpts. Add a Networking page explaining why and how to trunk experiment VLANs across multiple minimega hosts using OVS Layer 2 GRE tunnels, with links from Experiments and Settings.
Cover creation and existing-experiment configuration, server inheritance, default-bridge scope, physical-path MTU headroom, fragmentation, and connectivity checks.
Related Issue
None.
Type of Change
Checklist
Additional Notes
Documentation only; the code-comment item is not applicable. Reviewed behavior against the local phēnix implementation and linked official minimega, OVS, and GRE fragmentation references. No changes were made to sceptre-phenix.
Validation: repository-wide
make lint, strictmkdocs build, Conventional Commit validation, andgit diff --checkpassed. The existing prek configuration emits an ignoredauto_updatekey warning. No live multi-node experiment was run.One Conventional Commit, rebased on upstream/main.