update_ibgp_mesh.md

Update iBGP mesh

Once a new router is added to the network, it must become reachable by all other devices. To achieve this, the update_ibgp_mesh workflow must be executed. This workflow will add the new P router to all PE routers in the network, and add all existing PE routers to the new P router. The only input this workflow takes, is a trouble ticket number. All other required information is already in the service database.

The workflow will run 5 Ansible playbooks:

1. Check: add P router to all PE routers
2. Deploy: add P router to all PE routers
3. Check: add all PE routers to P router
4. Deploy: add all PE routers to P router
5. Verify: check that the iBGP has come up

Once these playbooks have been run successfully, the new P router is added to LibreNMS. Finally, the subscription model of the router is updated such that router_access_via_ts is set to False. This is because the router is now reachable by other machines by its loopback address. Using out of band access is therefore not needed anymore.