Vendor locks, unsupported module errors, matching modules to switches, NICs and routers
A UCS 6332 fabric interconnect has only 40G QSFP+ ports, but the upstream switches are 10G. How can the FI be uplinked at 10G, and why does the breakout option not appear on some ports?
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?
Cisco troubleshooting document: inserting certain SFPs (for example GLC-SX-MMD or third-party modules) into a Catalyst 3850 C3850-NM sub-module produces %PLATFORMPM-6-MODULEERRDISABLE: The inserted SFP module ... is not supported and %PM-4-ERRDISABLE: gbic-invalid ... putting ... in err-disable…
The poster asked how to test fibre cables from a switch. The guidance covers reading optical levels with show interfaces transceiver / show controllers, comparing TX and RX at both ends, and recognising that a reading of -40, -50 or -80 dBm means no signal is being received. Hardware involved…
A D-Link DES-3200-28 B1 switch logged DDM Port X optic module RX power exceeded the low warning/alarm threshold; the optical level looked abnormally low in the switch although the module measured fine when tested standalone. Hardware involved: D-Link DES-3200-28 B1, DDM-capable SFP. Reported…
The poster could not find documentation for the command service unsupported-transceiver and asked what it does and whether there are consequences. It is one of Cisco's hidden commands: without it IOS disables a port when a non-Cisco transceiver is inserted, because the OS reads the vendor field and…
A Huawei S6700 iStack did not form because the optical modules on the dedicated stacking ports 45-48 were of different types; the platform requires identical transceivers on those ports. The four ports 45-48 are the fixed stacking ports, and mixing, for example, an SR module on one and an LR module…
Huawei switches with third-party optics log SRM/3/SFPEXCEPTION ... Optical module exception, SFP is not certified daily, cluttering the logs during migrations even though the modules work. The modules pass traffic normlaly, but the daily SFPEXCEPTION traps flood the log buffer and the syslog…
On Huawei switches with 25GE ports the poster asked about using SFP+ transceivers and copper cables; per the troubleshooting docs, when a non-1 m copper cable is connected to a 25GE interface the RS-FEC function must be enabled or the interface goes Down, and mixing different optical modulles at…
Discussion of why re-coded modules fail Cisco validation: Cisco SFPs carry a unique signature tied to each serial number in bytes 96-127, and editing vendor name or serial makes the signature no longer match, so the switch rejects the module unless the signature is regenerated. Hardware involved…
Replacing an old Dell switch with an Extreme 5420M-24, the same SFP module that had worked in the Dell would not bring the network up: the uplink port was active with rising TX counters but RX stayed at zero, no DHCP address, no ping to the firewall, and a new SFP+ module behaved the same. Ethernet…
Monitoring reported packet loss toward an ESXi iSCSI host; on the Dell S4810 (FTOS 9.11(2.6)) the interface TenGigabitEthernet 0/37 showed the warning Non-qualified pluggable media present, SFP+ type is 10GBASE-CU2M because a non-Dell DAC was used. The link was up with normal traffic (about 16…
Dell R740xd servers with OEM Intel X710 adapters were cabled to Cisco switches with SFP-H10GB-CU5M and SFP-H10GB-CU3M DACs. Two cables linked, five did not; the working ones carried a blank or V02 version ID (made 2013), the failing ones V03 (made 2019), all identified as SFP-10GBase-CX1 on the…
A T2600G-28TS (TL-SG3424) uplinked over fibre to another building using D-Link transceivers and media converters showed the SFP port UP and transmitting but never receiving packets. Restart, factory reset and other SFP ports were tried. Another user returned the switch after failing to link it to…
Cisco-compatible CWDM SFP modules that had worked in Dell PowerConnect 6024 and 6224 switches produced a transmit failure error in a PowerConnect 8024F, presumably because the 8024F ports are SFP+. The poster considered Finisar FWLF1524P2Vxx modules but wanted confirmation from someone with a…
After a complete power loss a Dell R740 with a four-port Broadcom NDC (2x SFP+, 2x 1GbE) booted normally but the fibre SFP+ modules stayed unpowered and disconnected; a reboot did not help and only physically removing and reinserting the modules restored them. Dell support pointed at drivers and…
A UCG-Fiber used a UACC-CM-RJ45-MG 10GBASE-T module (port 6, later port 7) to reach a Zyxel XS1930. Whenever the copper cable was disconnected for more than about 40 s or the Zyxel rebooted, the link never came back until the module was pulled for a minute or the gateway rebooted; forcing 10G or 1G…
An out-of-the-box ES-48-Lite (1.9.3) was connected to an EdgeRouter Infinity ER-8-XG (2.0.9-hotfix.2) with a UF-RJ45-10G module on each side and a Cat6 cable. A laptop on the switch obtained a DHCP lease from the router only after about a minute and then could not reach the router or the internet…
Between VxRail Dell S5212F-ON TOR switches and Cisco C9500-48Y4C switches, FS.com SFP28 DACs behaved inconsistently: a 5 m cable custom-coded Cisco on one end and Dell on the other came Line Up, Protocol down; a 2 m Cisco/Cisco-coded cable linked; a 3 m cable would not link even with the 2 m…
A QSFP28 100 Gb DAC supplied by Supermicro linked two Dell S5248F-ON (OS10 10.4.3.6) switches fine, but between the Dell and a Supermicro XEM-100 the port showed up, line protocol is down. Multiple FEC and negotiation combinations were tried. The thread received no answers. Hardware involved: Dell…
A short no-name DAC between a UDM SE and a Minisforum MS-01 had worked for months; a new 30 m Ubiquiti UACC-AOC-SFP10-30M active optical cable was recognised by the UDM SE (vendor, part, serial, temperrature, power visible) but no link came up and the SFP port log showed an SFP EEPROM error; on…
The poster wanted to connect a UDM SE (10G SFP+) to an Enterprise XG 24 switch (25G SFP28) and asked whether an SFP+ DAC would work with the SFP28 port falling back to 10G, or whether an SFP28 DAC was preferable. The concern was whether the SFP28 cage would fall back to 10G with an ordinary SFP+…
A UDM Pro (port 11 set to 1G) and a US-16-150W (port 17) connected by a 1 m Ubiquiti DAC (UDC-1) did not talk: the switch showed a link light, the UDM Pro showed nothing. Setting both sides to 1G and rebooting both devices did not help; reversing the cable and removing the parallel copper uplink…
An ADDON JD097C-AO SFP+ DAC worked between two US-48-500W (firmware 3.3.11.3850) but not from a US-48-500W to a US-16-XG (3.7.39.6089): no link lights on either side and forcing 10G made no difference, although mca-dump on the XG showed the module fully parsed (sfpfound true, vendor ADDON, part…
An EdgeRouter 4 (EdgeOS 1.10.0) with the GPON SFP taken from a Bell Home Hub 3000 (Huawei MA5671A, SC connector, DDM readable: 50.9 C, 3.25 V, 8.87 mA, TX 1.36 mW, RX 0.02 mW) logged kernel: Failed to read SFP EEPROM1 at byte 0 val -11!! twelve times a minute although the internet worked. Removing…
On two sites a UNAS Pro (UniFi RJ45 SFP+ module) and a UNVR (UniFi fibre SFP+ module) dropped to 1G after every firmware update or power cycle; rebooting the device, the port or the switch did not help, only physically pulling and reinserting the module (or reseating the fibre) restored an…
After moving a Bell fibre connection from an ER-X to an ER-4 with the ISP's Alcatel-Lucent/Nokia GPON SFP (3FE46541AA / G-010S-P) plugged directly into eth3, the WAN dropped every 3 to 60 minutes; syslog had hundreds of kernel: Failed to read SFP EEPROM1 at byte 0 val -6!! entries and SFP module…
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…
A new UDM Pro replaced a USG-3; plugging its LAN SFP+ port into the free SFP port of a UniFi Switch 24 with a known-good SFP+ DAC (taken from a working switch-to-switch link) gave no link on either UDM Pro port, and manually setting the UDM Pro port to 1 Gbps did not help. Several other users…
After UniFi Network 10.0.140 / switch firmware 7.2.123 several operators saw SFP+ ports (UI optics, UACC-OM-MM-10G-D, MikroTik XS+DA0001 DACs, UACC-CM-RJ45-MG copper modules) flapping on US-XG-16, USW Pro Max, UDM Pro and USW-24-Pro units, with STP State Flapping alerts, ports blocked, and switches…
