FGT100F 10Gb Uplink to HPE SN2100M Switch through 100Gb to 4x25Gb Breakout Cable possible?

[futureweb]

Hey there,

we need to uplink our 2x SN2100M Switches to a FGT100F.

does anyone know if the FGT100F happens to be compatible with the HPE 100Gb QSFP28 to 4x25Gb SFP28 3m Direct Attach Copper Cable? (https://buy.hpe.com/us/en/options/cables-cable-kits/direct-attach-copper-active-optical-cables/direc...) Unfortunately, the firewall in our DC is 400km away, so I can't just test it out quickly. The 2xSN2100M are configured as MLAG and I would like to wire the FGT100F to each one of the 2 switches using LAG (LACP ??) Many Thanks, bye from Austria Andreas

[futureweb]

This would be the planed Setup with the FGT100F + 2x HPE SN2100M

If the Breakout Cable wouldn't work we would need to solve it through SFP+ Plug, Fibre Cable + QSFP28 Plug on Switch Side ... would like to avoid that because the SN2100M already has only a few ports and we would have to use 1 port per switch for the uplink that we could otherwise use for 4x25Gb ... ;)

thx Andreas

[Toshi_Esumi]

First I have to tell I'm no expert about QSFP28 100G ports. But I found this FS.com's article saying the port config needs to be changed to 40G then QSFP+ - 4xSFP+ DAC cable can connect between them, which kind of make sense to me. 10G side talks 10Gig only so it doesn't care if it's SFP+ or SFP28 modules. But 100G can split only to 4x25G, not to 4x10G.

[Toshi_Esumi]

Sorry. It would help if I attached the link...

https://community.fs.com/blog/qsfp28-100g-port-plays-with-40g-25g-and-10g.html

[futureweb]

Hey Toshi,

thx for your reply! :)

The SN2100M are capable of 10/25/40/50/100Gb on their Ports, so this shouldn't be a Problem.

I am more wondering whether the Fortigate can handle a third-party DAC plug. Especially with switches, I know that the devices are very sensitive if they are not an original DAC from the manufacturer. With Fortigate I got no empirical values so far because no DAC has yet been installed in Fortigate by me.

Andy

[Toshi_Esumi]

As there are some posts in the past for this topic, FGT doesn't check vendor ID on SFPs. I'm naturally assuming SFP+s as well.