Network/Switch tab on LuCI WebUI Clusterbox Dashboard explanation

[Marco_Venere]

Good morning
Can you help me understand the tab in question?

Switch “switch0” (mt7620), ports: 8 (cpu @ 6)

What exactly does the wording “ports: 8 (cpu @ 6)” mean?

VLANs on “switch0” (mt7620), ports: 8 (cpu @ 6)
VLAN ID Description CPU (eth0) LAN 1 LAN 2 WAN

I understand that we are dealing with two VLANs (so not a simple error in history*):

Is VLAN 1 a VLAN between Blade3 N1 and Blade3 N2?
Is VLAN 2 a VLAN between Blade3 N3 and Blade3 N4?

So:

CPU(eth0) is the pcie network?
LAN 1 is something like br_lan?
LAN 2 ?
WAN is eth0.2?

*At first glance (and for about a little month thereafter) it immediately seemed to me “the antechamber of death of my control board” :: a place where you touch something and you risk your salary in short!

By the way, what happens when I turn off the feature?

Thanks guys!!

[Buyuliang]

You can refer to the following introduction.

The CPU (eth0) is the core of all ports and is used to manage VLAN data.

LAN (br-lan)

Ports 0 and 1 form the LAN.
Connect to the CPU through eth0.1.
Use 169.192.1.1 as the IP address

WAN (external network)

Port 5 is used as the WAN.
eth0.2 is responsible for connecting to the external network.
Obtain an address through DHCP.

VLAN

VLAN 1 (LAN): eth0.1, ports 0,1,6t.
VLAN 2 (WAN): eth0.2, ports 5,6t.

Device Name	Type	Function	Notes
lo	Virtual device	Local loopback interface	Only used for internal communication within the device
pci0	Physical device	PCIe Ethernet	PCIe network card
br-lan	Logical bridge	LAN port bridge	Connects to eth0.1
eth0	Physical device	Switch chip connected to CPU	Responsible for all VLAN transmissions
eth0.1	VLAN device	VLAN 1 (LAN)	Connected to br-lan
eth0.2	VLAN device	VLAN 2 (WAN)	Directly connected to the external network
switch0	Switch chip	Port management	Responsible for VLAN allocation

about Blade3

The pci0 of mt7620 and Blade3 N1 ~ N4 pci0 form a LAN

[Marco_Venere]

It seems understandable and important to me.

I wonder: by disabling the service I will not run any risks, right? I gather the VLANs into a single LAN and keep all the services and connections active!?

VLAN 1 (LAN): eth0.1, porte 0,1,6t.

Are ports 0 and 1 then the IPv4 and IPv6 of the br-lan interface?

VLAN 2 (WAN): eth0.2, ports 5,6t.

It makes me think that ports 5 and 6 refer to the IPv4 and IPv6 connections of our WAN interfaces.

Port 5 is used as the WAN.
eth0.2 is responsible for connecting to the external network.
Obtain an address through DHCP.

Is port 6 then shared between VLAN 1 and VLAN 2? In this case, can WAN IPv6 be useful to connect to the CPU in case the other interfaces unfortunately remain unavailable?

What exactly do LAN 1 and LAN 2 on the column refer to? Maybe to br-lan and eth_pci?

Even if the rest will seem trivial to me in comparison:

The pci0 of mt7620 and Blade3 N1 ~ N4 pci0 form a LAN

Does this mean that the Blade3 N1, N2, N3, N4 via pci0 and mt7620 via pci0 form a LAN? In this case, could you tell me why I can’t find them all in my “nmap 10.20.0.0/24”? To tell the truth, I always find them two by two, the one from which I connect Blade3 and the adjacent one; my problem was exactly that of being able to reach each one through a PCIe connection, perhaps without routing and forwarding.

I’ll try again tonight at home. Maybe I manually set the connection and despite having entered the DNS correctly, the /etc/hosts file takes precedence causing the correct routing to be missing (!?). In this case I can recommend to execute a cluster reboot via:

ssh clusterbox [editor’s note 10.20.0.1] nodectl reboot -all && sudo reboot.

Instead set the host names via WebUI Network/DHCP DNS or via the file on clusterbox /etc/config/dhcp. In fact it seems that a normal reboot of the ClusterBox following a disconnection of a Blade3 does not restore the initial correct situation, this also – by the way – by running DHCP as auto on Blade3 SBCs.

Thank you very much.

[Marco_Venere]

If VLAN 1 and VLAN 2 represent our VLANs, what do LAN 1 and LAN 2 represent?

This page seems “DANGEROUS” to me, what mistakes should I not make to avoid being “kicked out” of the dashboard forever?

Could you tell me the exact meaning of the terms tagged and untagged?

Thanks

[Marco_Venere]

I would like to try to configure the br_lan but there is something that escapes me. I have to associate an interface (or maybe two?) and then take or assign an address to the hosts that connect to it so as to have them all in the same network domain!? When I associate pci0 I lose the connection with the Blades and when I associate eth0.2 I lose connectivity with the WAN, I am afraid of being left without the possibility of interfacing with the dashboard. If used alone it seems isolated even if I connect the rear port to the network switch. Once again then (thanks a lot to anyone who wants to provide me with some information), what do LAN1 and LAN2 represent in the figure? What do tagged, untagged and off mean? How can I register a host on the br_lan network?
Thanks.