LLC frame broadcast

For Developers
1

hi all
i have implemented a mesh network where device can roam from one AP to another using qca-wifi package .

after roam the device sends LLC package of its own mac
but i also want to send LLC of the device connected in bridge (backhaul devices)

i dont know which file may be managing the transmission of llc packet
(my Station broadcast all LLC (of its own and the backhaul ) when it get connected for the 1st time , but it fails to send the LLC of backhaul device when device roams from one AP to another.)

2

LLC ethertype is L2 link local, it does not forward as per ethernet specifications

3

atleast it should able to send the LLC of connected client .....
my device is configured as client + wds and if any mobile phone get connected with my station then it should be able to send its LLC to the Network when roams

4

Like every packet is controlled by llc on the ethernet. On every port. What ypu are not able to send? Wifi uses own media control protocols, not LLC

5 
        +------ AP A ------+       +------ AP B ------+
        |  (OpenWRT AP)   |       |  (OpenWRT AP)   |
        |                 |       |                 |
        +-----------------+       +-----------------+
                 |                          |
                 |       (Mesh Network)     |
                 |                          |
                 v                          v
          +-----------------+        
          |  Client C (STA) |  <-- (Roaming between AP A & AP B)
          |  (OpenWRT)      |
          +-----------------+
                   |
         ---------------------
         |                   |
 +---------------+     +---------------+
 |  Client E     |     |  Client F     |
 | (Backhaul Dev)|     | (Backhaul Dev)|
 +---------------+     +---------------+

here initially device C is connected with A , and when C roams to B it broadcasts its LLC only to the network , but it should also able to broadcast the LLC of E and F

6

Are you sure you talk about LLC - link-layer coding of ethernet that does not exit the cable?

7

LLC logical link Control
(to tell the rest devices on network that the device has been moved from A to B)

8

Thats switch forwarding-info-database aka fib

9

the data frame it broadcast to the network is LLC frame
which we can see via wireshark or acrylic packet capture tools

10

Every frame has LLC header with ethertype and mac addresses. What does not work? End hosts have no clue about next switch ports where packet goes.

11

I guess this can override normal switch operation.
https://openwrt.org/docs/guide-user/perf_and_log/flow_offloading

1 Like
12

i will check

13

in the very 1st time when it connects to any AP it send LLC of the backhaul devices (upstream and downstream both)
but when it roams to new AP it send only its own mac
so i dont think that not getting info is a problem here .
it somehow dropping the frame while transmitting

14

hostap proxies ethernet, it is close but not real deal.
Please show (replacing secret info with ABC)

ubus call system board
cat /etc/config/wireless # mark AP-s you roam between
cat /etc/config/network # add a note which ports are involved

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