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tkrjasek
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RB760iGS - when using SFP ethernet interfaces get locked

Fri Apr 30, 2021 11:01 am

This problem happens only when SFP module is inserted - probably because then ethernet ports share all the same lane and the SFP gets its own private lane to the CPU.
After some time (could be days or weeks, sometimes only hours) other interfaces stop working - RB sees ARP table, but I don't have ping or even arping to those hosts connected to other interfaces.
If i do some operation (like disable/enable) on those interfaces, all ARP (on other than SFP interfaces) get lost and no longer appears.
Only reboot fixes it.
This problem appears on several RB760iGS (probably all that use SFP).
I created support ticket more than a month ago, attached 2 supout.rif files - you think I got ANY reaction? :(
 
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Fri Apr 30, 2021 1:17 pm

Is the SFP module a compatible one ?
Network diagram ?
 
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Fri Apr 30, 2021 2:13 pm

The only way to work near stable on sfp1 on hEX s is:
do not support non-half and non-1G speed on any sfp compatible modules
/interface ethernet
set [ find default-name=sfp1 ] advertise=1000M-full arp=enabled arp-timeout=\
    auto auto-negotiation=yes bandwidth=unlimited/unlimited disabled=no \
    full-duplex=yes l2mtu=1596 loop-protect=default loop-protect-disable-time=\
    5m loop-protect-send-interval=5s mtu=1500 \
    name=sfp1 rx-flow-control=off speed=1Gbps tx-flow-control=off
 
tkrjasek
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Fri Apr 30, 2021 3:18 pm

Is the SFP module a compatible one ?
Network diagram ?
It should be, according to the wiki:
MikroTik devices and SFP/SFP+/QSFP+ modules do not have any restrictions for other vendor equipment. As long as the other vendor modules and devices comply with transceiver multi-source agreement (MSA) they should be compatible with MikroTik.
it's common "Cisco compatible" SFP that we use on hundreds of other devices without any problem, even other Routerboard models
but I can try using Mikrotik SFP if it makes any difference...

Diagram is simple, something like this:
Juniper swith --- EdgeCore switch --- sfp1 on RB760iGS = WAN (172.17.21.5/24)
Bridge (ether1 - ether5) = LAN (/29 public IP routed via WAN using OSPF/BGP)
(or even without bridge, doesn't make a difference)
The only way to work near stable on sfp1 on hEX s is:
well connection is stable as far as sfp1 goes - but other ethernet ports get locked, I can still access RB via SFP when that happens
and we use only 1Gbit FD modules
 
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Fri Apr 30, 2021 6:23 pm

What SFP module you use?
 
tkrjasek
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Tue May 04, 2021 8:46 am

What SFP module you use?
GigaLight 1.25G SM 1310/1550 (so like S-35/53LC20D)
 
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Re: RB760iGS - when using SFP ethernet interfaces get locked

Thu Mar 03, 2022 5:44 pm

I have the same problem with two RB760iGS.
It's is strange because I have totally six RB760iGS. And problems are observed just on two of them.
And I can not understand what is difference between routers which operate well and ones with problem.

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