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, 50 insertions, 0 deletions

diff --git a/docs/vpp/configuration/ipfix.md b/docs/vpp/configuration/ipfix.md
new file mode 100644
index 00000000..7ed2aee3
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+++ b/docs/vpp/configuration/ipfix.md
@@ -0,0 +1,50 @@
+# VPP IPFIX Configuration
+
+VPP IPFIX in VyOS allows monitoring and exporting network traffic flows
+for analytics, security, and accounting. IPFIX works with the VPP
+(Vector Packet Processing) backend to provide high-performance flow tracking.
+
+## Overview
+
+VyOS integrates VPP for high-performance packet processing. IPFIX
+configuration controls how flows are monitored, exported, and which
+interfaces are included.
+
+## Key IPFIX Concepts
+
+- **Active timeout**: Maximum time a flow is kept active before export.
+- **Inactive timeout**: Maximum time an idle flow is kept before export.
+- **Collector**: The remote host and port to which flow records are sent.
+- **Flow layers**: Determines which layer information is included
+  (`l2`, `l3`, `l4`).
+- **Interfaces**: Physical or virtual interfaces to monitor.
+- **Direction**: Which traffic to monitor (`rx`, `tx`, `both`).
+- **Flow variant**: Optional filter for IPv4 or IPv6 flows.
+
+## Configuration Options
+
+- **active-timeout**: Duration (in seconds) after which active flows
+  are exported.
+- **inactive-timeout**: Duration (in seconds) after which idle flows
+  are exported.
+- **collector \`\<ip>\` port \`\<port>\`**: IP and UDP port of the IPFIX collector.
+- **collector \`\<ip>\` source-address \`\<ip>\`**: Source address for flow export.
+- **flowprobe-record \`\<l2|l3|l4>\`**: Layers to include in flow records.
+- **interface** `<interface>` **\[direction** `<rx|tx|both>`**\]**
+  **\[flow-variant** `<ipv4|ipv6>`**\]**: Interfaces to monitor,
+  direction of traffic, and optional flow variant filter.
+
+## Example Configuration
+
+```none
+set vpp ipfix active-timeout '15'
+set vpp ipfix inactive-timeout '120'
+set vpp ipfix collector 192.0.2.2 port '4739'
+set vpp ipfix collector 192.0.2.2 source-address '192.0.2.1'
+set vpp ipfix flowprobe-record 'l2'
+set vpp ipfix flowprobe-record 'l3'
+set vpp ipfix flowprobe-record 'l4'
+set vpp ipfix interface eth0
+set vpp ipfix interface eth1 direction 'both'
+set vpp ipfix interface eth1 flow-variant 'ipv4'
+```