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, 157 insertions, 0 deletions

diff --git a/docs/vpp/configuration/interfaces/vxlan.md b/docs/vpp/configuration/interfaces/vxlan.md
new file mode 100644
index 00000000..2139f120
--- /dev/null
+++ b/docs/vpp/configuration/interfaces/vxlan.md
@@ -0,0 +1,157 @@
+---
+lastproofread: '2026-03-13'
+---
+
+(vpp-config-interfaces-vxlan)=
+
+```{include} /_include/need_improvement.txt
+```
+
+
+# VPP VXLAN Configuration
+
+VPP VXLAN interfaces provide virtual extensible local area network (VXLAN)
+tunneling with high-performance packet processing. VXLAN extends Layer 2
+domains across Layer 3 networks using UDP encapsulation, enabling scalable
+multi-tenant networking while leveraging VPP's optimized data plane.
+
+## Basic Configuration
+
+### Creating a VXLAN Interface
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\>
+
+Create a VXLAN interface where ``<vppvxlanN>`` follows the naming
+convention ``vppvxlan1``, ``vppvxlan2``, etc.
+```
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> vni \<vni\>
+
+Set the Virtual Network Identifier (VNI) for the VXLAN tunnel. Valid range
+is 0-16777214.
+```
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> remote \<address\>
+
+Set the tunnel remote endpoint address. Supports both IPv4 and IPv6
+addresses.
+```
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> source-address \<address\>
+
+Set the tunnel source address. Must match an address configured on the
+local system.
+```
+
+**Basic Example:**
+
+```none
+set interfaces vpp vxlan vppvxlan1
+set interfaces vpp vxlan vppvxlan1 vni 100
+set interfaces vpp vxlan vppvxlan1 remote 203.0.113.2
+set interfaces vpp vxlan vppvxlan1 source-address 192.168.1.1
+```
+
+## Interface Configuration
+### Description and Administrative Control
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> description \<description\>
+
+Set a descriptive name for the VXLAN interface.
+```
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> disable
+
+Administratively disable the VXLAN interface.
+```
+
+### Kernel Interface Integration
+
+The kernel interface is bound to the VXLAN tunnel for management and
+application compatibility.
+
+## IP Address Configuration
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> address \<ip-address/prefix\>
+
+Configure IPv4 or IPv6 addresses on the kernel interface. Multiple
+addresses can be assigned.
+```
+
+**Examples:**
+
+```none
+set interfaces vpp vxlan vppvxlan1 address 192.168.1.10/24
+set interfaces vpp vxlan vppvxlan1 address 2001:db8::10/64
+```
+
+## MTU Configuration
+
+```{cfgcmd} set interfaces vpp vxlan \<vppvxlanN\> mtu \<size\>
+
+Set the Maximum Transmission Unit (MTU) for the kernel interface. The MTU
+must be compatible with the connected VPP interface.
+```
+
+## Configuration Examples
+### Basic VXLAN Tunnel
+
+```none
+# IPv4 VXLAN tunnel
+set interfaces vpp vxlan vppvxlan1
+set interfaces vpp vxlan vppvxlan1 description "Tenant A network extension"
+set interfaces vpp vxlan vppvxlan1 vni 1000
+set interfaces vpp vxlan vppvxlan1 remote 203.0.113.10
+set interfaces vpp vxlan vppvxlan1 source-address 192.168.1.1
+```
+
+### IPv6 VXLAN Tunnel
+
+```none
+# IPv6 endpoints
+set interfaces vpp vxlan vppvxlan2
+set interfaces vpp vxlan vppvxlan2 vni 2000
+set interfaces vpp vxlan vppvxlan2 remote 2001:db8::2
+set interfaces vpp vxlan vppvxlan2 source-address 2001:db8::1
+```
+
+### VXLAN with Kernel Interface
+
+```none
+# VXLAN tunnel with management interface
+set interfaces vpp vxlan vppvxlan3
+set interfaces vpp vxlan vppvxlan3 vni 3000
+set interfaces vpp vxlan vppvxlan3 remote 203.0.113.30
+set interfaces vpp vxlan vppvxlan3 source-address 192.168.1.1
+set interfaces vpp vxlan vppvxlan3 address 10.0.3.1/24
+```
+
+## Bridge Integration
+
+VXLAN interfaces are commonly used as members in VPP bridges for Layer 2
+extension. See {doc}`bridge` for more information.
+
+```none
+# Add VXLAN tunnel to bridge
+set interfaces vpp bridge vppbr1
+set interfaces vpp bridge vppbr1 member interface vppvxlan1
+set interfaces vpp bridge vppbr1 member interface eth1
+set interfaces vpp bridge vppbr1 member interface vpplo1 bvi
+```
+
+### Multi-Tenant Configuration
+
+```none
+# Multiple VNIs for tenant separation
+set interfaces vpp vxlan vppvxlan10
+set interfaces vpp vxlan vppvxlan10 description "Tenant A - Production"
+set interfaces vpp vxlan vppvxlan10 vni 1001
+set interfaces vpp vxlan vppvxlan10 remote 203.0.113.20
+set interfaces vpp vxlan vppvxlan10 source-address 192.168.1.1
+
+set interfaces vpp vxlan vppvxlan11
+set interfaces vpp vxlan vppvxlan11 description "Tenant A - Development"
+set interfaces vpp vxlan vppvxlan11 vni 1002
+set interfaces vpp vxlan vppvxlan11 remote 203.0.113.21
+set interfaces vpp vxlan vppvxlan11 source-address 192.168.1.1
+```