Universal Ports as regular ports in 5720 in Fabric Mode

[RobertD1]

Hello,

Customer has inserted 100G transceiver in universal port U1 and a 100G DAC in port U2 (no VIM present) and the links don't come up and work with ISIS configured. Port U1 is down completely. Port U2 thinks it is up but not working.

As these are also stacking ports do they have to change the mode from stacking to ethernet ports? If so what is the command?

Edit: It is also ambiguous that the regular ports can support 100G. User Guide implies 40G maximum on QSFP28 ports used as regular ports. Think a VIM supports 100G but these are not installed.

Is the only way to use 100G by installing 5720-VIM-2CE?

Thanks,

Rob

[FredrikB-NN]

The data sheet is the source of truth. It states that you can have max 4 x 100 Gbps ports in all 5720 models. As there are two built-in QSFP28 and two in the expansion module, you get four in total. This means the built-in ones should work as normal QSFP28/100 Gbps ports.

https://extr-p-001.sitecorecontenthub.cloud/api/public/content/cd2674aa96764723a3b7d0d038b9c1f2?v=37...

You could potentially have to configure things like full duplex, auto negotiation (on or off), break out config (4 x 25 G etc.) or FEC to make this work. FEC should be RS-FEC as defined in Clause 91 of IEEE 802.3.  In EXOS it is called CL91. Spanning tree, SLPP or similar protocols may cause issues too. These problems can exist in one or both ends of the link.

[RobertD1]

Thanks Fredrik, will look at the port settings. Good to hear from you. Rob