Hi,
I was testing QinQ/stacked vlan/double vlan/doubletag on MT7621 and
noticed that it didn't work. I see packets correctly send with the
the stacked VLAN tag but the replies are never received by eth0.
Setup
=====
------------------------------------------------------------------------------
| eth0.1.23 | eth0.1.42 | eth0.1.5 | eth0.2.23 | eth0.2.5 | eth0.2.6 |
|--------------------------------------|---------------------------------------|
| eth0.1 | eth0.2 |
|------------------------------------------------------------------------------|
| eth0 |
------------------------------------------------------------------------------
* eth0 is the raw device/switch which gives the packets up with vlan headers
based on the ports (we need to address each port separately).
* eth0.1 is for port 1 and eth0.2 is for port 2
* eth0.1.23 is for packets which are send out to port 1 with vlan header 23
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 23 set
* eth0.1.42 is for packets which are send out to port 1 with vlan header 42
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 42 set
* eth0.1.5 is for packets which are send out to port 1 with vlan header 5
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 5 set
* eth0.2.23 is for packets which are send out to port 2 with vlan header 23
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 23 set
* eth0.2.5 is for packets which are send out to port 2 with vlan header 5
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 5 set
* eth0.2.6 is for packets which are send out to port 2 with vlan header 6
sending already works but we don't receive packets on eth0 from this port
when the received packet had vlan header 6 set
I would expect that I see following ethernet frame when I send a simple ping
through eth0.1.23:
--------------------------
|ETH HDR|VLAN 23|IP stuff|
--------------------------
This seems to work perfectly fine.
Now the receiver of the ICMP packet will send a reply:
--------------------------
|ETH HDR|VLAN 23|IP stuff|
--------------------------
And thus I would expect that the CPU (eth0) sees following packet:
---------------------------------
|ETH HDR|VLAN 1|VLAN 23|IP stuff|
---------------------------------
But instead I get nothing at all.
I've already tried to change the tagged CPU port egress mode to stack
but then I will get following packets as replies for eth0.1
--------------------------------
|ETH HDR|VLAN 0|VLAN 1|IP stuff|
--------------------------------
And I get no replies for eth0.1.23 on eth0.
Question
========
I was told that on older ralink (esw_rt3052) switches there was a
register 0xe4 (SGC2) which could influence the behavior of
vlan-in-vlan. I don't have more information about that.
Does anyone have the register specification for the MT7530 or any other
idea how I could configure specific VLANs for each port.
Kind regards,
Sven
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