The ZCU216 has a 4 x 25.7 cage for a CAUI-4. In order to receive jumbo
frames at a receiving NIC that only has 100GbE ports, what kind of
hardware cable work would be appropriate?
I have attempted to work closely with a hardware manufacturer, but I feel
they are unreliable in their "advice". They sent detailed results of a
connection test of their own cable, allegedly proving that their hardware
is appropriate for my use case. But they clearly implemented a single
25GBASE-CR connection over a single port of a network switch, which then
addressed a single device on the receiving side (enp1s0f0) . Their
receiving NIC was set to 4x25 port configuration, making it even less
relevant. I post this question here as a last resort, not a first resort
for this ongoing problem.
Lacking a ZCU216 and its FPGA, the tech support specialists used a network
switch as a substitute. Here is the list of the ports on their switch from
their results. (truncated for space)
```
FS#show interfaces status
Interface Status Vlan Duplex Speed
Type
---------------------------------------- -------- ---- ------- ---------
------
TenGigabitEthernet 0/1 down 1 Unknown Unknown
fiber
.
.
.
TenGigabitEthernet 0/30 down 1 Unknown Unknown
fiber
TFGigabitEthernet 0/21 up 1 Full 25G
fiber
TFGigabitEthernet 0/22 down 1 Unknown Unknown
fiber
.
.
.
```
Ethtool for their single network device shows 25GBASE-CR.
```
Settings for enp1s0f0:
Supported ports: [ FIBRE ]
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: None RS BASER
Advertised link modes: 10000baseT/Full
25000baseCR/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: None RS BASER
*Speed: 25000Mb/s*
Duplex: Full
```
But 25BASE-CR is not CAUI-4. I conclude this test is therefore useless
for this network configuration. Your thoughts?
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