feat: activate 106 visual-validated canaries via swap

Imports 105 MD files (plus quick-start already present) from
origin/myst/current and adds them to docs/_swap.txt. The selection
is the BackstopJS visual-passers cohort: pages with <5% rendered
diff vs the live RST docs at docs.vyos.io/en/latest/, filtered to
those with an RST counterpart on current and no cmdincludemd usage
(template-format reconciliation pending).

Local sphinx-build with all 106 swapped: succeeded with 100
warnings (vs 95 baseline). The 5 new warnings are all undefined
cross-reference labels, not build failures:
- contributing/development.md (missing 'coding-guidelines')
- operation/upgrade-recovery.md (3 missing 'how_it_works' /
  'cancelling_recovery')
- vpp/configuration/dataplane/{buffers,memory,unix}.md (missing
  'vpp_config_dataplane_*' labels)

Source list: ~/.claude/projects/-Users-vybot-GitHub-vyos-documentation/docs/2026-04-29-myst-conversion-audit/visual-passers-under-5pct.txt
BackstopJS report: claude/gifted-hertz-74b9f9 worktree
(visual-compare/), 2026-04-23 vs vyos--1838.org.readthedocs.build.

🤖 Generated by [robots](https://vyos.io)

2 files changed, 284 insertions, 0 deletions

diff --git a/docs/configuration/service/md-index.md b/docs/configuration/service/md-index.md
new file mode 100644
index 00000000..4018c5be
--- /dev/null
+++ b/docs/configuration/service/md-index.md
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+# Service
+
+```{toctree}
+:includehidden: true
+:maxdepth: 1
+
+broadcast-relay
+config-sync
+conntrack-sync
+console-server
+dhcp-relay
+dhcp-server
+dns
+eventhandler
+https
+ipoe-server
+lldp
+mdns
+monitoring
+ntp
+pppoe-server
+router-advert
+salt-minion
+snmp
+ssh
+tftp-server
+webproxy
+suricata
+```
diff --git a/docs/configuration/service/md-snmp.md b/docs/configuration/service/md-snmp.md
new file mode 100644
index 00000000..6a5a66e5
--- /dev/null
+++ b/docs/configuration/service/md-snmp.md
@@ -0,0 +1,255 @@
+(snmp)=
+
+# SNMP
+
+{abbr}`SNMP (Simple Network Management Protocol)` is an Internet Standard
+protocol for collecting and organizing information about managed devices on
+IP networks and for modifying that information to change device behavior.
+Devices that typically support SNMP include cable modems, routers, switches,
+servers, workstations, printers, and more.
+
+SNMP is widely used in network management for network monitoring. SNMP exposes
+management data in the form of variables on the managed systems organized in
+a management information base ([MIB]) which describe the system status and
+configuration. These variables can then be remotely queried (and, in some
+circumstances, manipulated) by managing applications.
+
+Three significant versions of SNMP have been developed and deployed. SNMPv1 is
+the original version of the protocol. More recent versions, SNMPv2c and SNMPv3,
+feature improvements in performance, flexibility and security.
+
+SNMP is a component of the Internet Protocol Suite as defined by the Internet
+Engineering Task Force (IETF). It consists of a set of standards for network
+management, including an application layer protocol, a database schema, and a
+set of data objects.
+
+## Overview and basic concepts
+
+In typical uses of SNMP, one or more administrative computers called managers
+have the task of monitoring or managing a group of hosts or devices on a
+computer network. Each managed system executes a software component called an
+agent which reports information via SNMP to the manager.
+
+An SNMP-managed network consists of three key components:
+
+- Managed devices
+- Agent - software which runs on managed devices
+- Network management station (NMS) - software which runs on the manager
+
+A managed device is a network node that implements an SNMP interface that
+allows unidirectional (read-only) or bidirectional (read and write) access to
+node-specific information. Managed devices exchange node-specific information
+with the NMSs. Sometimes called network elements, the managed devices can be
+any type of device, including, but not limited to, routers, access servers,
+switches, cable modems, bridges, hubs, IP telephones, IP video cameras,
+computer hosts, and printers.
+
+An agent is a network-management software module that resides on a managed
+device. An agent has local knowledge of management information and translates
+that information to or from an SNMP-specific form.
+
+A network management station executes applications that monitor and control
+managed devices. NMSs provide the bulk of the processing and memory resources
+required for network management. One or more NMSs may exist on any managed
+network.
+
+:::{figure} /_static/images/service_snmp_communication_principles_diagram.png
+:alt: Principle of SNMP Communication
+:scale: 20 %
+
+Image thankfully borrowed from
+<https://en.wikipedia.org/wiki/File:SNMP_communication_principles_diagram.PNG>
+which is under the GNU Free Documentation License
+:::
+
+:::{note}
+VyOS SNMP supports both IPv4 and IPv6.
+:::
+
+## SNMP Protocol Versions
+
+VyOS itself supports [SNMPv2] (version 2) and [SNMPv3] (version 3) where the
+later is recommended because of improved security (optional authentication and
+encryption).
+
+### SNMPv2
+
+SNMPv2 is the original and most commonly used version. For authorizing clients,
+SNMP uses the concept of communities. Communities may have authorization set
+to read only (this is most common) or to read and write (this option is not
+actively used in VyOS).
+
+SNMP can work synchronously or asynchronously. In synchronous communication,
+the monitoring system queries the router periodically. In asynchronous, the
+router sends notification to the "trap" (the monitoring host).
+
+SNMPv2 does not support any authentication mechanisms, other than client source
+address, so you should specify addresses of clients allowed to monitor the
+router. Note that SNMPv2 also supports no encryption and always sends data in
+plain text.
+
+#### Example
+
+```none
+# Define a community
+set service snmp community routers authorization ro
+
+# Allow monitoring access from the entire network
+set service snmp community routers network 192.0.2.0/24
+set service snmp community routers network 2001::db8:ffff:eeee::/64
+
+# Allow monitoring access from specific addresses
+set service snmp community routers client 203.0.113.10
+set service snmp community routers client 203.0.113.20
+
+# Define optional router information
+set service snmp location "UK, London"
+set service snmp contact "admin@example.com"
+
+# Trap target if you want asynchronous communication
+set service snmp trap-target 203.0.113.10
+
+# Listen only on specific IP addresses (port defaults to 161)
+set service snmp listen-address 172.16.254.36 port 161
+set service snmp listen-address 2001:db8::f00::1
+```
+
+### SNMPv3
+
+SNMPv3 (version 3 of the SNMP protocol) introduced a whole slew of new security
+related features that have been missing from the previous versions. Security
+was one of the biggest weakness of SNMP until v3. Authentication in SNMP
+Versions 1 and 2 amounts to nothing more than a password (community string)
+sent in clear text between a manager and agent. Each SNMPv3 message contains
+security parameters which are encoded as an octet string. The meaning of these
+security parameters depends on the security model being used.
+
+The security approach in SNMPv3 targets:
+
+- Confidentiality – Encryption of packets to prevent snooping by an
+  unauthorized source.
+- Integrity – Message integrity to ensure that a packet has not been tampered
+  while in transit including an optional packet replay protection mechanism.
+- Authentication – to verify that the message is from a valid source.
+
+(snmp-v3-example)=
+
+#### Example
+
+- Let SNMP daemon listen only on IP address 192.0.2.1
+- Configure new SNMP user named "vyos" with password "vyos12345678"
+- New user will use SHA/AES for authentication and privacy
+
+```none
+set service snmp listen-address 192.0.2.1
+set service snmp location 'VyOS Datacenter'
+set service snmp v3 engineid '000000000000000000000002'
+set service snmp v3 group default mode 'ro'
+set service snmp v3 group default view 'default'
+set service snmp v3 user vyos auth plaintext-password 'vyos12345678'
+set service snmp v3 user vyos auth type 'sha'
+set service snmp v3 user vyos group 'default'
+set service snmp v3 user vyos privacy plaintext-password 'vyos12345678'
+set service snmp v3 user vyos privacy type 'aes'
+set service snmp v3 view default oid 1
+```
+
+After commit the plaintext passwords will be hashed and stored in your
+configuration. The resulting CLI config will look like:
+
+```none
+vyos@vyos# show service snmp
+ listen-address 192.0.2.1 {
+ }
+ location "VyOS Datacenter"
+ v3 {
+     engineid 000000000000000000000002
+     group default {
+         mode ro
+         view default
+     }
+     user vyos {
+         auth {
+             encrypted-password 4e52fe55fd011c9c51ae2c65f4b78ca93dcafdfe
+             type sha
+         }
+         group default
+         privacy {
+             encrypted-password 4e52fe55fd011c9c51ae2c65f4b78ca93dcafdfe
+             type aes
+         }
+     }
+     view default {
+         oid 1 {
+         }
+     }
+ }
+```
+
+You can test the SNMPv3 functionality from any linux based system, just run the
+following command: `snmpwalk -v 3 -u vyos -a SHA -A vyos12345678 -x AES
+-X vyos12345678 -l authPriv 192.0.2.1 .1`
+
+## VyOS MIBs
+
+All SNMP MIBs are located in each image of VyOS here: `/usr/share/snmp/mibs/`
+
+You are be able to download the files using SCP, once the SSH service
+has been activated like so
+
+```none
+scp -r vyos@your_router:/usr/share/snmp/mibs /your_folder/mibs
+```
+
+## SNMP Extensions
+
+To extend SNMP agent functionality, custom scripts can be executed every time
+the agent is being called. This can be achieved by using
+`arbitrary extensioncommands`. The first step is to create a functional
+script of course, then upload it to your VyOS instance via the command
+`scp your_script.sh vyos@your_router:/config/user-data`.
+Once the script is uploaded, it needs to be configured via the command below.
+
+```none
+set service snmp script-extensions extension-name my-extension script your_script.sh
+commit
+```
+
+The OID `.1.3.6.1.4.1.8072.1.3.2.3.1.1.4.116.101.115.116`, once called, will
+contain the output of the extension.
+
+```none
+root@vyos:/home/vyos# snmpwalk -v2c  -c public 127.0.0.1 nsExtendOutput1
+NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."my-extension" = STRING: hello
+NET-SNMP-EXTEND-MIB::nsExtendOutputFull."my-extension" = STRING: hello
+NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."my-extension" = INTEGER: 1
+NET-SNMP-EXTEND-MIB::nsExtendResult."my-extension" = INTEGER: 0
+```
+
+## SolarWinds
+
+If you happen to use SolarWinds Orion as NMS you can also use the Device
+Templates Management. A template for VyOS can be easily imported.
+
+Create a file named `VyOS-1.3.6.1.4.1.44641.ConfigMgmt-Commands` using the
+following content:
+
+```none
+<Configuration-Management Device="VyOS" SystemOID="1.3.6.1.4.1.44641">
+    <Commands>
+        <Command Name="Reset" Value="set terminal width 0${CRLF}set terminal length 0"/>
+        <Command Name="Reboot" Value="reboot${CRLF}Yes"/>
+        <Command Name="EnterConfigMode" Value="configure"/>
+        <Command Name="ExitConfigMode" Value="commit${CRLF}exit"/>
+        <Command Name="DownloadConfig" Value="show configuration commands"/>
+        <Command Name="SaveConfig" Value="commit${CRLF}save"/>
+        <Command Name="Version" Value="show version"/>
+        <Command Name="MenuBased" Value="False"/>
+        <Command Name="VirtualPrompt" Value=":~"/>
+    </Commands>
+</Configuration-Management>
+```
+
+[mib]: https://en.wikipedia.org/wiki/Management_information_base
+[snmpv2]: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol#Version_2
+[snmpv3]: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol#Version_3