Revert "docs: Update OpenFabric page to VyOS 1.5 standards (#2060) (#2094)" (#2096)

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----
-myst:
-  html_meta:
-    description: |
-      OpenFabric is a routing protocol derived from IS-IS that provides
-      link-state routing with optimized flooding, making it well-suited
-      for spine-leaf topologies.
-    keywords: openfabric, isis, link-state, spine-leaf, fabric, net, lsp
----
-
-(openfabric)=
-
-# OpenFabric
-
-% stop_vyoslinter
-OpenFabric, specified in [draft-white-openfabric-06.txt](https://datatracker.ietf.org/doc/html/draft-white-openfabric-06),
-% start_vyoslinter
-is a routing protocol derived from IS-IS. It provides link-state routing with
-optimized flooding, making it well-suited for spine-leaf topologies.
-
-OpenFabric is a dual-stack protocol. A single instance can simultaneously
-route both IPv4 and IPv6 traffic.
-
-## Configuration
-
-### Mandatory settings
-
-Each OpenFabric router must be configured with a unique
-{abbr}`NET (Network Entity Title)`, the
-{abbr}`CLNS (Connectionless Network Service)` equivalent of a Router ID. The
-6-byte system identifier portion of the NET must be unique across the fabric.
-
-```{cfgcmd} set protocols openfabric net \<network-entity-title\>
-
-**Configure the Network Entity Title (NET) for the router.**
-
-A typical NET looks like ``49.0001.1921.6800.1002.00``.
-
-The NET consists of the following parts:
-
-- **{abbr}`AFI (Authority and Format Identifier)`** (`49`): OpenFabric
-  conventionally uses AFI value 49 for private addressing.
-- **Area identifier** (`0001`): The area number within the fabric (in this
-  case, Area 1).
-- **System identifier** (`1921.6800.1002`): Uniquely identifies the router
-  within the fabric. We recommend deriving this value from the router IP
-  address or MAC address. To construct the system identifier from an IPv4
-  address (for example, `192.168.1.2`):
-
-  - Pad each octet with leading zeros: `192.168.1.2` → `192.168.001.002`.
-  - Regroup the digits into three 4-digit blocks: `192.168.001.002` →
-    `1921.6800.1002`.
-
-- **NET selector** (`00`): Must always be `00` to indicate the local system.
-```
-
-Example:
-
-```none
-set protocols openfabric net 49.0001.1921.6800.1002.00
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> address-family \<ipv4|ipv6\>
-
-**Configure the named OpenFabric domain on a specific interface for the
-given address family (IPv4 or IPv6).**
-
-For dual-stack operation, run the command twice: once with `ipv4` and once
-with `ipv6`.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth1 address-family ipv4
-set protocols openfabric domain fabric1 interface eth1 address-family ipv6
-```
-
-### OpenFabric global configuration
-
-```{cfgcmd} set protocols openfabric domain \<name\> domain-password \<plaintext-password|md5\> \<password\>
-
-**Configure the authentication password for the specified OpenFabric
-domain.**
-
-The password can be specified as either plain text or
-an {abbr}`MD5 (Message-Digest Algorithm 5)` hash.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 domain-password md5 'shared-secret'
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> purge-originator
-
-**Enable {abbr}`POI (Purge Originator Identification)` for the specified
-OpenFabric domain.**
-
-POI is defined in RFC 6232.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 purge-originator
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> set-overload-bit
-
-**Configure the overload bit for the specified OpenFabric domain.**
-
-This instructs other routers in the domain not to use this router for
-transit traffic.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 set-overload-bit
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> log-adjacency-changes
-
-**Enable logging of adjacency state changes in the specified OpenFabric
-domain.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 log-adjacency-changes
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> fabric-tier \<0-14\>
-
-**Configure a static tier number for the specified OpenFabric domain.**
-
-The router advertises the tier value to indicate its location in the
-OpenFabric domain.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 fabric-tier 1
-```
-
-### Interface configuration
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> hello-interval \<1-600\>
-
-**Configure the interval, in seconds, at which the router transmits Hello
-packets on this interface.**
-
-Hello packets are exchanged with neighbors to establish and maintain
-adjacencies.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 hello-interval 5
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> hello-multiplier \<2-100\>
-
-**Configure the multiplier used to compute the Hello hold time on the
-specified interface.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 hello-multiplier 3
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> metric \<0-16777215\>
-
-**Configure the routing metric for the specified interface.**
-
-This metric is used in path selection to determine the most efficient
-route. Lower metrics indicate preferred paths.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 metric 100
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> passive
-
-**Enable passive mode for the specified interface.**
-
-In passive mode, the router does not send Hello packets on the interface
-and does not form adjacencies.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 passive
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> password \<plaintext-password|md5\> \<password\>
-
-**Configure the authentication password for the specified interface.**
-
-The password can be specified as either plain text or
-an {abbr}`MD5 (Message-Digest Algorithm 5)` hash.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 password plaintext-password link-secret
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> csnp-interval \<1-600\>
-
-**Configure the interval, in seconds, at which
-{abbr}`CSNPs (Complete Sequence Number PDUs)` are sent on the specified
-interface.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 csnp-interval 10
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> interface \<interface\> psnp-interval \<0-120\>
-
-**Configure the interval, in seconds, at which
-{abbr}`PSNPs (Partial Sequence Number PDUs)` are sent on the specified
-interface.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 interface eth0 psnp-interval 2
-```
-
-### Timers
-
-```{cfgcmd} set protocols openfabric domain \<name\> lsp-gen-interval \<1-120\>
-
-**Configure the minimum interval, in seconds, between successive
-generations of the same {abbr}`LSP (Link State PDU)` in the OpenFabric
-domain.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 lsp-gen-interval 5
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> lsp-refresh-interval \<1-65235\>
-
-**Configure the LSP refresh interval, in seconds, for the OpenFabric
-domain.**
-```
-
-```{note}
-The value must be lower than `max-lsp-lifetime`. Otherwise, LSPs will
-time out before they can be refreshed.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 lsp-refresh-interval 900
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> max-lsp-lifetime \<360-65535\>
-
-**Configure the maximum lifetime, in seconds, for LSPs in the OpenFabric
-domain.**
-
-By default, LSPs remain in the link-state database for 1200 seconds and
-are deleted if they are not refreshed.
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 max-lsp-lifetime 1200
-```
-
-```{cfgcmd} set protocols openfabric domain \<name\> spf-interval \<1-120\>
-
-**Configure the minimum interval, in seconds, between consecutive
-{abbr}`SPF (Shortest Path First)` calculations in the OpenFabric domain.**
-```
-
-Example:
-
-```none
-set protocols openfabric domain fabric1 spf-interval 5
-```
-
-## Example
-
-The following example demonstrates a basic OpenFabric configuration between
-two routers.
-
-**Node 1:**
-
-```none
-set interfaces loopback lo address '198.51.100.1/32'
-set interfaces ethernet eth1 address '192.0.2.1/24'
-
-set protocols openfabric domain VyOS interface eth1 address-family ipv4
-set protocols openfabric domain VyOS interface lo address-family ipv4
-set protocols openfabric domain VyOS interface lo passive
-set protocols openfabric net '49.0001.1980.5110.0001.00'
-```
-
-**Node 2:**
-
-```none
-set interfaces loopback lo address '198.51.100.2/32'
-set interfaces ethernet eth1 address '192.0.2.2/24'
-
-set protocols openfabric domain VyOS interface eth1 address-family ipv4
-set protocols openfabric domain VyOS interface lo address-family ipv4
-set protocols openfabric domain VyOS interface lo passive
-set protocols openfabric net '49.0001.1980.5110.0002.00'
-```
-
-After committing the configuration, verify the neighbor adjacencies on both
-nodes: 
-
-```none
-vyos@node-1:~$ show openfabric neighbor
-show openfabric neighbor
-Area VyOS:
-  System Id           Interface   L  State        Holdtime SNPA
-  node-2              eth1        2  Up            27      2020.2020.2020
-
-
-vyos@node-2:~$ show openfabric neighbor
-show openfabric neighbor
-Area VyOS:
-  System Id           Interface   L  State        Holdtime SNPA
-  node-1              eth1        2  Up            30      2020.2020.2020
-```
-
-Verify that the OpenFabric routes have successfully populated:
-
-```none
-vyos@node-1:~$ show ip route openfabric
-show ip route openfabric
-Codes: K - kernel route, C - connected, S - static, R - RIP,
-       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
-       T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR,
-       f - OpenFabric,
-       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
-       t - trapped, o - offload failure
-
-f   192.0.2.0/24 [115/20] via 192.0.2.2, eth1 onlink, weight 1, 00:00:10
-f>* 198.51.100.2/32 [115/20] via 192.0.2.2, eth1 onlink, weight 1, 00:00:10
-
-vyos@node-2:~$ show ip route openfabric
-show ip route openfabric
-Codes: K - kernel route, C - connected, S - static, R - RIP,
-       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
-       T - Table, v - VNC, V - VNC-Direct, A - Babel, F - PBR,
-       f - OpenFabric,
-       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
-       t - trapped, o - offload failure
-
-f   192.0.2.0/24 [115/20] via 192.0.2.1, eth1 onlink, weight 1, 00:00:48
-f>* 198.51.100.1/32 [115/20] via 192.0.2.1, eth1 onlink, weight 1, 00:00:48
-```