Bridge Becomes Unresponsive (must reboot)

luis.espinal

4/4/24, 7:06 PM

We noticed in some of our hardware that our switch (an integrated KSZ9477) stops responding, with the logs showing the following:

[ 9585.977985] ksz9477-switch 0-005f port1: Link is Down
[ 9585.983206] br0: port 2(port1) entered disabled state
[ 9585.993337] ksz9477-switch 0-005f port1: failed (err=-11) to del object (id=2)
[12664.128536] Microchip KSZ9477 dsa-0.0:01: Master/Slave resolution failed

When the bridge port goes down, it is impossible to stop/restart the systemd network. A reboot is the only workaround we have.

I searched for both "entered disabled state" and "Master/Slave resolution failed", and I see people reporting without seeing a common/cohesive root cause.

Any idea of why a switch port would enter into a disabled state, and what does "Master/Slave resolution failed" means?

Thanks.

1 + 0

linux

bridge

dsa

Score:0

Server

ulrich17

4/5/24, 5:53 AM

do you have some more info?

for i in $(brctl show|awk '{print $4}'|grep -v id) ; do ethtool $i; echo " # " ;ifconfig $i; done

+ 2

Dave M

4/5/24, 11:41 AM

This does not provide an answer to the question. Once you have sufficient [reputation](https://serverfault.com/help/whats-reputation) you will be able to [comment on any post](https://serverfault.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/low-quality-posts/548066)

ulrich17

4/6/24, 11:40 AM

Yes, you are right and sorry. The loop would show possible interface errors and the state of the NICs. So maybe the asker will see the failure and can act.

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