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AntonP
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Posts: 4
Joined: Mon Jul 11, 2016 11:19 am

Loop Protect do not shut/block interface/vlan

Fri Oct 14, 2016 3:44 pm

Good day.

We have RB3011UiAS and trying lab to prevent a loop with "Loop Protect" feature but with interesting result.
When we make the loop we see this messages in log:
time=16:23:40 topics=interface,warning message="ether2.1610 received loop protect packet originated from E4:8D:8C:7E:31:37 (ether2)"
time=16:23:41 topics=interface,warning message="ether2.1610: bridge port received packet with own address as source address (e4:8d:8c:7e:31:37), probably loop"
time=16:23:46 topics=interface,warning message="ether2.1610: bridge port received packet with own address as source address (e4:8d:8c:7e:31:37), probably loop"
time=16:23:51 topics=interface,warning message="ether2.1610: bridge port received packet with own address as source address (e4:8d:8c:7e:31:37), probably loop"
time=16:23:55 topics=interface,warning message="ether2 excessive broadcasts/multicasts, probably a loop"
time=16:23:56 topics=interface,warning message="ether2.1610: bridge port received packet with own address as source address (e4:8d:8c:7e:31:37), probably loop"
time=16:24:01 topics=interface,warning message="ether2.1610: bridge port received packet with own address as source address (e4:8d:8c:7e:31:37), probably loop"


So Routerboard find this loop correctly. But do nothing to prevent it. CPU ~ 100%. The FW is 6.37.1, loop protect is on and disable time is 1 minute.

And only after 1 minute (disable time) we see:
time=16:25:10 topics=interface,info message="ether2.1610 link down"
time=16:25:10 topics=interface,info message="ether2.1610 link up"

Why loop protect didn't shut down vlan after loop detected?
Thank you.
 
carlosfrosario
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Posts: 4
Joined: Fri Jul 21, 2017 3:03 am

Re: Loop Protect do not shut/block interface/vlan

Wed Mar 25, 2020 4:06 am

Same here on routeros 6.46, using eoip. did you find the problem?

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