Latest questions from the community.
We are refreshing a pair of aggregation closets and the optics line is the part management keeps poking at. The switches are EXOS boxes and the plan was to fill the 40G uplinks with generic QSFP+ DACs, the same way we already do on the access ports. Then someone on the team dug up a note about a…
Four HP ProCurve 6120XG blade switches (516733-B21) refused J9150A 10G SR SFP+ transceivers that the datasheet lists as supported; show tech transceivers reported them as unsupported. The switches ran Z.14.56. The poster asked whether a firmware upgrade or a configuration setting was needed…
I finally moved my VDSL2 line off the ISP box and terminated it on the Turris Omnia itself, mostly so that PPPoE runs on the router instead of on a second device in bridge mode. The setup part was pleasant: seat the stick in the cage and the WAN interface simply moves onto the module, leaving the…
The poster wanted to connetc Aruba 2540 switches (JL357A, firmware YC.16.09.0001) to Cisco Catalyst 9300 switches using Cisco SFP-H10GB-CU3M DACs. After enabling allow-unsupported-transceiver the cables were still not recognised: show tech transceivers listed the port as unsupported, the LED…
I inherited a Sun Network 10GbE Switch 72p with a couple of legacy boxes hanging off it that will never do more than a gigabit. The plan was to drop a 1G capable module into one of the SFP+ cages and be done with it. Sun Network 10GbE Switch 72p, SEFOS CLI over the serial console x2129a dual-rate…
H3C-SFP-10G-T-SO 10GBASE-T copper modules (from FS or Solid Optics) worked out of the box in a FlexFabric 5940 (JH398A) with the JH181A 24-port SFP+ card, but in a FlexFabric 5945 (JQ076A) with the same card the ports only came up after manually running port up-mode on the interface. The poster…
We are standing up four DGX Spark nodes for disttributed training and hung them off a MikroTik CRS812-8DS-2DQ-2DDQ. The plan was one 400G QSFP-DD port on the switch feeding two nodes at 200G each, so a couple of breakout cables cover the whole cluster. MikroTik CRS812-8DS-2DQ-2DDQ, QSFP-DD ports…
Two Flex System enclosures, each with an EN4093R 10Gb Scalable Switch (option 49Y4270) as the network module. Ports come back error-disabled after a chassis power event, and less often drop into the same state while everything is running. It is not always the same ports, which is what makes this so…
Home rack, and the RB5009 has exactly one SFP+ cage. I wanted a second copper gigabit uplink out of it rather than pulling fibre across the room, so a copper module went in instead. MikroTik RB5009UG+S+IN, RouterOS 7.1rc4 MikroTik S-RJ01 1000BASE-T copper SFP in sfp-sfpplus1 Cat6 patch, about three…
The poster operated old HP/H3C A5800 switches (JC100A, JC103A) with many SFP modules of mixed coding. Modules with H3C in A0h bytes 60h-62h worked but logged This is not a supported transceiver for this platform, and DDM plus serial/date information were unavailable. Copying the full data from a…
Even with allow-unsupportted-transceiver enabled, HPE Aruba 3810M and 2930M switches showed an amber fault for generic SFP+ modules, including ones recoded to masquerade as a J9151A. The author traced the behaviour to HPE's HPIDv2 challenge-response authentication: the module EEPROM carries a flag…
Rebuilding aggregation at one of our sites: a CRS326-24S+2Q+RM takes the custmer SFP+ ports and uplinks over 40G into a Huawei S6720. Short run inside the same rack, so a passive DAC rather than optics. MikroTik CRS326-24S+2Q+RM, QSFP+ port qsfpplus1-1 Huawei S6720-54C-EI-48S-AC, plain 40GE port…
Small home lab. I flashed a Linksys LGS328C over to OpenWrt SNAPSHOT to get away from the stock web interface. Everything survived the move except one SFP28 port that used to work perfectly well. switch: Linksys LGS328C (Realtek rtl930x), OpenWrt SNAPSHOT module: Dell S28-10G-25G-SR-85C, dual-rate…
I look after a small office network, one switch closet, and the four SFP+ cages on our access switch carry the 10G links to the server rack. It ran for months without a thought and now one cage is simply gone. TP-Link TL-SG3428X-M2 (V1), firmware 1.20.4 Build 20241104 Rel.40746, adopted in Omada…
We have a leased dark pair between two POPs, roughly 115 km, and both ends land on a Cisco Catalyst 6506. The requirement is modest: one gigabit, no DWDM, no channel plan, just a working point to point link. What came back when I asked Cisco how to build it from their own catalogue was an…
