On an Extreme Summit X670 two QSFP+ ports were configured as 4x10G, the ports were set to 10000 full duplex with auto off and VLANs assigned, but a breakout cable with an MPO connector to six LC connectors produced no link on the QSFP+ sie or on the SFP+ side. Hardware involved: Extreme Summit…
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…
A Mellanox ConnectX-3 40GbE NIC connected with Mellanox QSFP passive copper cables (MC2210126-005) to a Dell PowerConnect 8164 (firmware 5.1.4.5) produced a link-up event for a few seconds followed by a permanent link-down. The same cables worked NIC-to-NIC, and Dell refused support 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…
Speccing the uplinks for an M4300-96X before the order goes in, and the 40G side has turned into a dead end that I would like to sanity check with people who have actually built one. NETGEAR M4300-96X chassis APM402XL port card for the 40G QSFP+ ports planned: two 40GBASE-X runs to the neighbouring…
Small office rack: there is a 40G card in the file server and a switch with spare uplink ports, so instead of buying another box I tried to hang the server straight off the switch. Both ends see the cable, the link never comes up. Huawei S6730-H24X6C, QSFP28 uplink ports QNAP LAN-40G2SF-MLX in the…
I run pfSense on a small box with a Chelsio T580 and I want one of the QSFP+ ports feeding four 10G hosts instead of a single 40G link. The breakout cable is still on its way, so I would rather have the card in the right mode before it lands. pfSense box, Chelsio T580, one QSFP+ port sitting on a…
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…
The poster compiled and loaded i40e 3.4.2 on Ubuntu 16.04 for an Intel XL710-QDA2 dual-port 40GbE adapter. The driver loaded fine, but as soon as non-Intel QSFP+ cables were attached dmesg reported "Rx/Tx is disabled on this device because an unsupported SFP+ module type was detected." and no link…
On a Cisco Nexus N9K-C93180YC-FX, QSFP-40G-SR-BD BiDi modules are not detected at all: nothing appears in the logs when they are inserted and they are absent from 'show interface transceiver', whereas QSFP-40GE-LR4 modules in the same ports are logged and listed normally. Several QSFP-40G-SR-BD…
The poster wanted to use a 40G QSFP+ to 4x10G SFP+ DAC breakout cable on a Cisco Catalyst 9500-32QC-E running IOS XE 17.6.4 (Bengaluru). The 'hw-module breakout' command is rejected; in global configuration only 'hw-module slot' and 'hw-module subslot' are offered. The switch is not running…
