feat: flip swap mechanism — MD as primary, RST as override (Phase 1)

This is the first of three phases inverting the per-page swap mechanism
so MD becomes the canonical primary and RST becomes the rare override.

Phase 1 — file renames + conf.py exclude_patterns flip only:
- Rename docs/**/md-<stem>.md to docs/**/<stem>.md (drop md- prefix)
  for all 254 stems previously listed in docs/_swap.txt
- Rename docs/**/<stem>.rst to docs/**/rst-<stem>.rst (add rst- prefix)
  for the same 254 stems
- Repurpose docs/_swap.txt as docs/_rst_overrides.txt; initially empty
  comment-only since no pages need the RST fallback right now
- conf.py exclude_patterns flipped: rst-*.rst is now excluded by default
  instead of md-*.md
- conf.py runtime-artifact references updated to _rst_override_state.json
  and _md_exclude.txt (Phase 2 will rewrite swap_sources.py to produce
  these names; for now no swap script runs because overrides list is empty)

Phase 2 (next commit on this branch) will rewrite scripts/swap_sources.py
with inverted rename direction, delete scripts/import_myst.py + tests, and
update tests/test_swap_sources.py for the new semantics.

Phase 3 will be the cleanup pass and ready-for-review flip.

Generated by robots https://vyos.io

1 files changed, 193 insertions, 0 deletions

diff --git a/docs/configuration/system/ipv6.md b/docs/configuration/system/ipv6.md
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+# IPv6
+
+## System configuration commands
+
+```{cfgcmd} set system ipv6 disable-forwarding
+
+   Use this command to disable IPv6 forwarding on all interfaces.
+```
+
+
+```{cfgcmd} set system ipv6 neighbor table-size \<number\>
+
+Use this command to define the maximum number of entries to keep in
+the Neighbor cache (1024, 2048, 4096, 8192, 16384, 32768).
+```
+
+
+```{cfgcmd} set system ipv6 strict-dad
+
+Use this command to disable IPv6 operation on interface when
+Duplicate Address Detection fails on Link-Local address.
+```
+
+
+```{cfgcmd} set system ipv6 multipath layer4-hashing
+
+Use this command to user Layer 4 information for ECMP hashing.
+```
+
+### Zebra/Kernel route filtering
+
+
+Zebra supports prefix-lists and Route Maps to match routes received from
+other FRR components. The permit/deny facilities provided by these commands
+can be used to filter which routes zebra will install in the kernel.
+
+```{cfgcmd} set system ipv6 protocol \<protocol\> route-map \<route-map\>
+
+Apply a route-map filter to routes for the specified protocol. The following
+protocols can be used: any, babel, bgp, isis, ospfv3, ripng, static
+
+:::{note}
+If you choose any as the option that will cause all protocols that
+are sending routes to zebra.
+:::
+```
+
+### Nexthop Tracking
+
+
+Nexthop tracking resolve nexthops via the default route by default. This is enabled
+by default for a traditional profile of FRR which we use. It and can be disabled if
+you do not want to e.g. allow BGP to peer across the default route.
+
+```{cfgcmd} set system ipv6 nht no-resolve-via-default
+
+Do not allow IPv6 nexthop tracking to resolve via the default route. This
+parameter is configured per-VRF, so the command is also available in the VRF
+subnode.
+```
+
+## Operational commands
+
+
+### Show commands
+
+```{opcmd} show ipv6 neighbors
+
+Use this command to show IPv6 Neighbor Discovery Protocol information.
+```
+
+
+```{opcmd} show ipv6 groups
+
+Use this command to show IPv6 multicast group membership.
+```
+
+
+```{opcmd} show ipv6 forwarding
+
+Use this command to show IPv6 forwarding status.
+```
+
+
+```{opcmd} show ipv6 route
+
+Use this command to show IPv6 routes.
+
+Check the many parameters available for the show ipv6 route command:
+
+:::{code-block} none
+vyos@vyos:~$ show ipv6 route
+Possible completions:
+  <Enter>       Execute the current command
+  <X:X::X:X>    Show IPv6 routes of given address or prefix
+  <X:X::X:X/M>
+  bgp           Show IPv6 BGP routes
+  cache         Show kernel IPv6 route cache
+  connected     Show IPv6 connected routes
+  forward       Show kernel IPv6 route table
+  isis          Show IPv6 ISIS routes
+  kernel        Show IPv6 kernel routes
+  ospfv3        Show IPv6 OSPF6 routes
+  ripng         Show IPv6 RIPNG routes
+  static        Show IPv6 static routes
+  summary       Show IPv6 routes summary
+  table         Show IP routes in policy table
+  tag           Show only routes with tag
+  vrf           Show IPv6 routes in VRF
+:::
+```
+```{opcmd} show ipv6 prefix-list
+
+   Use this command to show all IPv6 prefix lists
+
+   There are different parameters for getting prefix-list information:
+
+   :::{code-block} none
+   vyos@vyos:~$ show ipv6 prefix-list
+   Possible completions:
+     <Enter>       Execute the current command
+     <WORD>        Show specified IPv6 prefix-list
+     detail        Show detail of IPv6 prefix-lists
+     summary       Show summary of IPv6 prefix-lists
+   :::
+```
+
+
+```{opcmd} show ipv6 access-list
+
+Use this command to show all IPv6 access lists
+
+You can also specify which IPv6 access-list should be shown:
+
+:::{code-block} none
+vyos@vyos:~$ show ipv6 access-list
+Possible completions:
+  <Enter>       Execute the current command
+  <text>        Show specified IPv6 access-list
+:::
+```
+```{opcmd} show ipv6 ospfv3
+
+   Use this command to get information about OSPFv3.
+
+   You can get more specific OSPFv3 information by using the parameters
+   shown below:
+
+   :::{code-block} none
+   vyos@vyos:~$ show ipv6 ospfv3
+   Possible completions:
+     <Enter>       Execute the current command
+     area          Show OSPFv3 spf-tree information
+     border-routers
+                   Show OSPFv3 border-router (ABR and ASBR) information
+     database      Show OSPFv3 Link state database information
+     interface     Show OSPFv3 interface information
+     linkstate     Show OSPFv3 linkstate routing information
+     neighbor      Show OSPFv3 neighbor information
+     redistribute  Show OSPFv3 redistribute External information
+     route         Show OSPFv3 routing table information
+   :::
+```
+
+
+```{opcmd} show ipv6 ripng
+
+Use this command to get information about the RIPNG protocol
+```
+
+
+```{opcmd} show ipv6 ripng status
+
+Use this command to show the status of the RIPNG protocol
+```
+
+### Reset commands
+
+```{opcmd} reset bgp ipv6 \<address\>
+
+Use this command to clear Border Gateway Protocol statistics or
+status.
+```
+```{opcmd} reset ipv6 neighbors \<address | interface\>
+
+Use this command to reset IPv6 Neighbor Discovery Protocol cache for
+an address or interface.
+```
+```{opcmd} reset ipv6 route cache
+
+Use this command to flush the kernel IPv6 route cache.
+An address can be added to flush it only for that route.
+```
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