India joined 2 months ago
6 questions
12 comments
NOC shift lead from Bengaluru. Mostly Dell and HPE.
The poster wanted to use a QSFP+ 40G-to-4x10G breakout cable on a two-port Mellanox ConnectX-3 Pro (MT27520, firmware 2.42.5044, PSID HP1370110017, MLNX OFED 4.6 on Debian 9.6) so each 10G leg could connect to a different switch, similar to what an Intel XL710 offers. SR-IOV virtual functions had…
We are moving the office uplinks from copper to fibre and the quote that came back has DrayTek-branded optics in every line. Before I start arguing about the difference against ordinary 10G modules I would like to know whether the hardware actually cares what sits in the cage, because the…
Standing up a small traffic-test bench next to the production fabric, and the tester ports will not come up over copper at all. HP 5900 40G switch, JC772A HP JG328A 40G QSFP+ direct attach cable Ixia Xcellon-Multis QSFP 40/10GE load module Spirent TestCenter 40G module, tried as a second opinion HP…
On Aruba 2930F switches (JL255A) the poster installed new J9151E 10G SFP+ transceivers (part 1990-4727) that the transceiver guide lists as supported, but every unit was reported as Unsupported Transceiver (SelfTest Err#128000) and show tech transceivers showed ?? for type and serial. J9281D DACs…
With an Aruba 2930F connected to a server through a Stornet-branded J9283D-SN passive 3 m SFP+ DAC, port 50 dropped the link immediately after it came up and port 52 flapped with the log message FFI : Port: 52 Excessive link state transitions. The same cable worked on ports 49 and 51, and fibre…
The poster runs a Cisco Nexus 5000 with an N2K-C2232PP-10GE fabric extender. Three FEX-facing ports report 'sfp validation failed' with Cisco FET-10G modules. Following advice found online, the module was removed, the port speed set to 1000 and the module reinserted; the port was also shut/no shut…