x690 how many 25gbe can you have

[Keith9]

On an EXOS X690 48-port SFP+ Switch, it looks like the 6 slots on the far right have 2 QSFP up to 40gbe, and possibly 4 SFP28 100gbe interfaces?  Lets say I want to connect the last port to another x690 and establish MLAG peer relationship over that, plus trunk any other vlans we need from one datacenter switch to another.  Can I use the other 3 SFP28 slots and break them out into 12 x 25gbe fiber optic cables?

[FredrikB-NN2]

The answer is in the datasheet:

QSFP Port Configurations Support
• 4 x 10Gb/40Gb QSFP+ ports and 2 10Gb/25Gb/40Gb/50Gb/100Gb QSFP28 ports
or
• 4 x 10Gb/25Gb/40Gb/50Gb/100Gb QSFP28 ports (two QSFPports inactive)  <--- this is what you want I guess?

I would be very hesitant to use only one link for the ISC (MLAG inter-switch link). As a minimum, also configure an alternate ISC VLAN that you run through a separate 1 or 10 G link. By far the best way to build an MLAG pair is to use a LAG for the ISC with minimum two links. Also, separate the two ports as much as possible in order to minimize hardware dependencies between the two.

[Keith9]

So it sounds like if you use the 4 QSFP28 ports, the system disables the 2 QSFP 10/40 gig ports?

Yeah I would consider using the last two ports with 100gb dac cables between two x690's and create vlan MLAG-ISC tag 4094 for example over that lag.  I guess would be something like enable sharing 65 grouping 65,69 algorithm address-based L3_L4 lacp.

I guess if i partition the other two QSFP28's for 25gbe I'd have 8 then.  ports 57,58,59,60,61,62,63,64.
If I need more than 8 25gbe then I guess I need to go up to a more expensive switch.