docs(nh3-pve): AMT cable is on UDM port 6, not nh3-sw1 (first pass read a stale port table)

persistent-memory.md

@@ -136,8 +136,8 @@ hermes-gateway, Booth, ttyd, zellij-web and dev-backup are running.
   UDM reservation). It had no IP because Linux had the port DOWN. `igc` powers
   off the PHY and AMT loses its link. Our own 09-25 removal of `enp88s0` from
   vmbr0 caused that. Fix: `auto enp88s0` (up, no IP, unbridged) plus IPv6 off via
-  sysctl.d, persistent. The cable is on an **nh3-sw1 trunk** (untagged
+  sysctl.d, persistent. The cable is on **UDM port 6** (`forward: all`;
-  nh3-default), not the UDM.
+  AMT is untagged, so nh3-default).
   **Open:** check that KVM + Opt-in None are set (needs the AMT admin password),
   then move the NanoKVM to the gx10.
 - Found and fixed: **lxc-pve 6.0.0-1 broke Docker in the CT** (runc 1.5 sysctl

servers/nh3-pve/README.md

@@ -61,10 +61,15 @@ not power back on by itself.
   1.2 with legacy renegotiation, so OpenSSL 3 clients need
   `Options = UnsafeLegacyRenegotiation`; browsers cope. 16992 (plain HTTP) is
   closed. 664 (TLS redirection: SOL/IDER/KVM) is open. It does not answer ping.
-  - **Port:** the I226-LM `enp88s0` (MAC `58:47:ca:76:96:0e`) is cabled to a
+  - **Port:** the I226-LM `enp88s0` (MAC `58:47:ca:76:96:0e`) is cabled to
-    **trunk port on nh3-sw1**, not the UDM (seen from the host: STP from
+    **PFI-UDMSE port 6** (Prime; confirmed from the UDM, which lists the AMT MAC
-    `48:a9:8a:40:8a:51`, untagged nh3-default plus tagged VLANs 10/50/90/250).
+    on port 6 at 1 Gb). Port 6 is `forward: all`, meaning untagged nh3-default
-    AMT is untagged, so it lands on **nh3-default `10.100.0.0/24`**.
+    plus every tagged VLAN, so AMT (untagged) lands on **nh3-default
+    `10.100.0.0/24`**.
+    ⚠ The first pass wrongly placed it on nh3-sw1, for two reasons. The UDM's port
+    table was read 15 s after link-up, before the UDM refreshed it (it polls, and
+    lags about a minute). And nh3-sw1's STP BPDUs, seen on the wire, are flooded
+    through the UDM's switch, so they do not locate the cable.
   - **Lease:** UDM DHCP reservation `nh3-pve-amt` → `10.100.0.151`.
   - ⚠ **Why it had no IP: Linux had the port DOWN.** When `igc` downs the I226-LM
     it powers off the PHY, and AMT's link goes with it (measured: "Link detected:
@@ -81,8 +86,10 @@ not power back on by itself.
   - **Not yet verified:** KVM redirection is enabled with User Opt-in = None
     (this needs the AMT admin password), and AMT keeps its link with the host
     powered off (this depends on the MEBx power policy).
-  - Better home, not done: nh3-mgmt (VLAN 250), by setting that nh3-sw1 port's
+  - Better home, not done (Prime's call): make UDM port 6 native nh3-mgmt
-    native VLAN to 250. infra-ops has no nh3-sw1 access.
+    (VLAN 250) and drop the tagged VLANs, so AMT alone sits on the management
+    network. It would need a new reservation and a DNS change. The UDM API key
+    can do it.
   - MEBx menu: Ctrl+P at boot.
 - **Console OOB exists: a Sipeed NanoKVM** is attached (USB `3346:1009` on the host;
   web UI **`https://10.100.250.171`**, switch port 23, nh3-mgmt). It gives video and
@@ -101,8 +108,8 @@ not power back on by itself.
   without network anyway: open the NanoKVM console, run `ip -br link`, and compare
   names against `/etc/network/interfaces` (backup in `/root/nic-pin-2026-09-25/`).
 - **`enp88s0` (the AMT port) is not a vmbr0 bridge port** (removed 2026-09-25).
-  STP is off, and that port is on the same nh3-sw1 trunk, so bridging it would
+  STP is off, and UDM port 6 carries the same VLANs as the uplink, so bridging it
-  loop the site LAN. It is held admin-UP on its own instead (AMT bullet above).
+  would loop the site LAN. It is held admin-UP on its own instead (AMT bullet above).
 - **GPU: RTX 2000E Ada at `01:00.0`** (`10de:28b0`), installed 2026-09-25. The
   NIC pins held: the X710 moved to bus 03 and every NIC kept its name. **NVIDIA
   580.178.04** (open modules, DKMS) has been on the host since 2026-09-25 at 1527