[ideaship]

The network configuration guide used dummy0 for the dummy interface that carries a node's own addresses in a routed network, and relied on the frr role's dummy0 default for the BGP announcements. OSISM is moving away from the dummy0 name: the rest of OSISM uses loopback0, and new deployments should not be set up with the legacy name.

Four commits, each standing on its own:

1. Use loopback0 in the IPv6 fabric example: the device, its addresses and internal_interface become loopback0. The example also sets frr_loopback_interface: loopback0; without it, the renamed example would announce none of the host's addresses while the frr role defaults to dummy0.
2. Explain what loopback0 is for: the "Dummy interfaces" section says what the interface does in a BGP-to-the-host network, why it should be named loopback0 rather than dummy0, and that frr_loopback_interface should name it.
3. Document network_dummy_devices: this is what the network role renders into Netplan's dummy-devices on Ubuntu 24.04 and later, and what the inventory reconciler generates from NetBox. network_dummy_interfaces (systemd.netdev) is described as the older form that existing configurations use; it still works and is needed before Ubuntu 24.04.
4. Use network_dummy_devices in the fabric example, so the page shows one form. The device then keeps the kernel's default MTU instead of network_dummy_interface_mtu. That doesn't limit traffic to or from its addresses, which is routed through the uplinks and uses their MTU (checked with a loopback0 MTU of 1280 and 1328-byte packets in both directions).

Because the example sets frr_loopback_interface explicitly, it is correct whatever the frr role's default is. Changing that default to loopback0 is proposed separately; this change does not depend on it:

• frr: Default the loopback interface to loopback0 ansible-collection-services#2185

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✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
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✅ JSON	jsonlint	4		0		0	0.1s
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✅ MARKDOWN	markdownlint	180		0		0	2.78s
✅ MARKDOWN	markdown-table-formatter	180		0		0	0.37s
✅ REPOSITORY	betterleaks	yes		no		no	0.59s
✅ REPOSITORY	checkov	yes		no		no	15.7s
✅ REPOSITORY	git_diff	yes		no		no	0.06s
✅ REPOSITORY	secretlint	yes		no		no	1.05s
✅ REPOSITORY	trufflehog	yes		no		no	2.97s
✅ SPELL	codespell	190		0		0	0.55s
⚠️ SPELL	lychee	190		4		0	51.42s
✅ YAML	prettier	6		0		0	0.4s
✅ YAML	v8r	6		0		0	5.91s
✅ YAML	yamllint	6		0		0	0.55s

Detailed Issues

⚠️ SPELL / lychee - 4 errors

📝 Summary
---------------------
🔍 Total.........1215
🔗 Unique.........908
✅ Successful....1107
⏳ Timeouts.........0
🔀 Redirected.......9
👻 Excluded.......104
❓ Unknown..........0
🚫 Errors...........4
⛔ Unsupported......4

Errors in .claude/skills/security-advisory/SKILL.md
[400] https://cveawg.mitre.org/api/cve/ (at 16:18) | Rejected status code: 400 Bad Request
[404] https://raw.githubusercontent.com/osism/ (at 17:18) | Rejected status code: 404 Not Found
[400] https://registry.osism.tech/service/token (at 18:19) | Rejected status code: 400 Bad Request

Errors in docs/release-notes/osism-7.md
[ERROR] https://www.openstack.org/software/openstack-bobcat (at 978:38) | Connection failed. Check network connectivity and firewall settings

Hint: Followed 9 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

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