With auto-negotiation off and 10G configured on sfp1/sfp2 of a CCR1036-12G-4S (RouterOS 6.43.8), MikroTik S+DA0001 and Amphenol DACs still run at 1G and the Cisco side shows no link at 10G. Which part of this link should be checked first?
A MikroTik RB4011 connected with an S+DA0001 DAC to a CRS106-1C-5S and a CRS112-8G-IN (all default configuration apart from IP addresses) had no connectivity over the SFP link. The RB4011 SFP+ cage is documented to accept onyl active direct-attach cables, so a passive twinax between it and the two…
With a CSS326-24G-2S+ (SwOS 2.6) and a server with an Intel 82599 card, two different S+DA0001 DACs and two Intel cards never linked; two CSS326 switches connected by DAC only achieved 1 Gbps. A later reader on SwOS 2.12 with an 82599 reported the same. No solution was posted. Hardware involved…
After upgrading a CRS309-1G-8S+IN from RouterOS 6.48.6 to 7.14.1 (and 7.15beta8), ports 5 and 7 with 10Gtek ASF-GE-T (FTRJ8519P1BNL-PT) copper SFPs showed sfp-rx-loss: yes and no-link when auto-negotiation was enabled; disabling auto-negotiation and forcing 1G full duplex restored the link…
A user with a MikroTik GPON ONU SFP module in a RouterBOARD facing a FiberLink OLT saw the interface as registered but the module serial never appeared in the OLT for provisioning. The thread turned into a reliability report: an operator lost every deployed MikroTik GPON module within two months of…
With auto-negotiation on, CRS317 and CRS326 SFP+ interfaces ran at 10G; with auto-negotiation=no, speed=10Gbps and full-duplex=yes the log still reported link up (speed 1G, full duplex) regardless of the advertise settings. On a CCR1009 the same configuration produced no-link instead, showing that…
A MikroTik CRS312-4C+8XG (RouterOS 7.13.4) and a Ubiquiti USW-Pro-48 (6.6.61) over 20 m OM3 with SR 850 nm SFP+ optics would only negotiate 1G full duplex; 10G attempts failed with no link and occasional Rx Fault on the UniFi side. Several fibre and transceiver combinations were tested and RouterOS…
Contradicting MikroTik's documented advice to force 1G full duplex when using 1G optics in SFP+ ports, a Netpower Lite 7R linked to an RBFTC11 only with auto-negotiation (forced 1G gave link up but zero received packets), while the same Netpower to a CRS328-4C-20S-4S+ had heavy packet loss and FCS…
Replacing the ISP ONU with a Baudcom DB-1234-SFM GPON SFP stick in a hEX S: the stick registered with the OLT and obtained an IP with the spoofed MAC, but with sfp1 as WAN pings returned network unreachable, although the same configuration on ether1 (behind the ISP ONU) worked and Winbox showed no…
Two Solid Optics SFP-H25GB-CU5M SFP28 DACs between a MikroTik CCR2004-1G-12S+2XS and an FS S5860-20SQ switch produced status: no-link on sfp28-1 and sfp28-2 with auto-negotiation off, 25 Gbps, full duplex, FEC91 and no flow control; RouterOS 7.8rc1 was tried on vendor advice. The modules were…
A MikroTik CSS610-8G-2S+IN showed an active SFP+ link, but Intel X520-DA1/DA2 NICs (Windows, Linux, ESXi) reported no link, reproducibly across multiple transceiver pairs, DACs and two cards. Firmware 2.12, 2.13rc6, 2.13rc12, 2.13rc25 and the final 2.13 were tested. Hardware involved: MikroTik…
A CRS326-24G-2S+RM and a CCR1009-7G-1C-1S+PC connected with a MikroTik SplusDA0001 SFP+ DAC only linked at 1 Gbps; enabling 10G dropped the link, and the CRS326 in SwOS did not even offer a 10G option. The poster needed SwOS for harrdware LACP. RouterOS/SwOS updates, supout files, and a replacement…
A CSS326 (SwOS 2.12) uplinked to an RB4011 throuhg an FS.com 10G active DAC accumulated Rx MAC errors, Rx FCS errors and Tx pauses. Cleaning the DAC connectosr did not help, and the poster asked whether SwOS had SFP+ bugs. Hardware involved: MikroTik CSS326-24G-2S+, MikroTik RB4011, FS.com 10G…
The poster wanted to use a MikroTik XS+DA0001 passive DAC between the 1G SFP port of an RB3011 and an SFP+ port of a CRS309 and asked whether a passive cable can bridge different SFP generations. The RB3011 SFP cage is 1G only while the CRS309 cage is SFP+ (10G), and a passive DAC has no active…
A FLYPRO SFP-1G-CS-100M 1000BASE-T module in a MikroTik CRS112-8P-4S (RouterOS 6.47.10) was detected but reported no-link with sfp-rx-loss: yes, whatever the far end (MikroTik LHG/RB750Gr3, Ubiquiti, Cisco). Fixed 1G speeds, other module units and rebootts were tried; only a Ubiquiti switch linked…
