[#808] LLDP topology fetch (phase 2): 18 links from LibreNMS discovery

lldp-topology.sh pulls the links table (hostnames + ports both ends) —
input for GLPI NetworkEquipment + port-connection population under the
Change being filed for phase 2a.
https://projects.knownelement.com/issues/808

.crush/active-ticket

@@ -1 +1 @@
-#705
+#808

lldp-topology-librenms.tsv

@@ -0,0 +1,18 @@
+pfv-r5-core-01.knel.net	g26	ap-tablemount.knel.net	eth0
+pfv-r3-tor-stor-01.knel.net	g20	pfv-r5-core-01.knel.net	g13
+pfv-r3-tor-stor-01.knel.net	g21	pfv-r5-core-01.knel.net	g16
+pfv-r3-tor-stor-01.knel.net	g22	pfv-r5-core-01.knel.net	g15
+pfv-r3-tor-stor-01.knel.net	g23	pfv-r5-core-01.knel.net	g14
+pfv-r3-tor-stor-01.knel.net	g24	pfv-r5-core-01.knel.net	g17
+pfv-r3-tor-mgmt-01.knel.net	g24	pfv-r5-core-01.knel.net	g12
+pfv-r6-mgmt-01.knel.net	g1	pfv-r5-core-01.knel.net	g39
+pfv-r5-core-01.knel.net	g12	pfv-r3-tor-mgmt-01.knel.net	g24
+pfv-r5-core-01.knel.net	g13	pfv-r3-tor-stor-01.knel.net	g20
+pfv-r5-core-01.knel.net	g14	pfv-r3-tor-stor-01.knel.net	g23
+pfv-r5-core-01.knel.net	g15	pfv-r3-tor-stor-01.knel.net	g22
+pfv-r5-core-01.knel.net	g16	pfv-r3-tor-stor-01.knel.net	g21
+pfv-r5-core-01.knel.net	g17	pfv-r3-tor-stor-01.knel.net	g24
+pfv-r5-core-01.knel.net	g39	pfv-r6-mgmt-01.knel.net	g1
+pfv-r5-core-01.knel.net	g9	ap-wallmount.knel.net	eth0
+pfv-r5-core-01.knel.net	g41	pfv-tsys1.knel.net	nic0
+pfv-r5-core-01.knel.net	g40	pfv-tsys1.knel.net	nic1

scripts/lldp-topology.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# lldp-topology.sh — pull LLDP neighbor links from LibreNMS [#808 phase 2]
+#
+# Reads the LibreNMS links table (LLDP/CDP discovery) and emits
+# hostnameA, portA, hostnameB, portB rows. Run ON tsys-librenms as root
+# (MariaDB local auth) or via: lldp-topology.sh --fetch
+#
+# Output feeds GLPI NetworkEquipment + port-connection creation
+# (phase 2 of the GLPI x LibreNMS cross-feed). See librenms-glpi-drift.sh
+# for the device-level report (phase 1).
+set -uo pipefail
+
+LNMS_HOST="${LNMS_HOST:-100.86.204.77}"
+QUERY="SELECT d1.hostname, p1.ifName, d2.hostname, p2.ifName
+FROM links l
+JOIN devices d1 ON l.local_device_id=d1.device_id
+JOIN devices d2 ON l.remote_device_id=d2.device_id
+LEFT JOIN ports p1 ON l.local_port_id=p1.port_id
+LEFT JOIN ports p2 ON l.remote_port_id=p2.port_id;"
+
+if [ "${1:-}" = "--fetch" ]; then
+    ssh -o BatchMode=yes "root@${LNMS_HOST}" "mysql -N librenms -e \"$QUERY\"" 2>/dev/null
+else
+    # local mode: run on tsys-librenms itself
+    mysql -N librenms -e "$QUERY" 2>/dev/null
+fi