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December 17th, 2024 03:45
S5248F-ON QSFP-DD ports: 200G or 2x100G?
I'm trying to determine authoritatively what's the fastest speed configuration on the QSFP-DD ports on the S5248F-ON.
The installation guide says:
Table 5. QSFP-DD port LEDs—S5248F-ON
LED Description
|
Link/Activity LED—200GbE, 100GbE, 40GbE, or 10GbE mode |
First LED:
|
|
Link/Activity LED—2x100G mode |
First and fifth LEDs:
|
However, the SmartFabric guide says:
Table 25. Port groups and breakout modes on the S5248F-ON switch
Port Group Ports Supported breakout modes
|
Port-group1/1/13 |
49, 50 |
● 100g-2x ● 50g-4x ● 40g-2x ● 25g-8x ● 10g-8x |
On the switch itself, checking the port-group's options:
OS10(conf-pg-1/1/13)# mode eth
100g-2x Breakout to 2 100G interfaces
50g-4x Breakout to 4 50G interfaces
40g-2x Breakout to 2 40G interfaces
10g-8x Breakout to 8 10G interfaces
25g-8x Breakout to 8 25G interfaces
So, no 200G mode. Also the S5200 datasheet only mentions 100G ports and none faster.
Seems like only switches with QSFP56-DD ports can do 200G, and the DD ports on the S5248F are QSFP28-DD? (Doesn't help that often, including in Dell documentation, the exact type is omitted and those ports are described only as "QSFP-DD".)
I think that QSFP56 supports PAM4 signaling and QSFP28 doesn't.
Not a dealbreaker since I'll be using those ports for VLTi, but it's confusing/inconsistent.
DELL-Erman O
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December 17th, 2024 08:15
Hi,
It looks like there's some confusion due to the different documentation sources. I know, it's frustrating when things don't add up. But the switch you've got, the S5248F-ON, has QSFP28-DD ports, which are limited to 100G speeds. The indicators on the switch might be showing 200G speeds, but that's just an error or a mistake in the documentation.
You're right, the S5200 datasheet only mentions 100G ports, and the SmartFabric guide shows the same thing.
If you want to get more advanced information or clarify any doubts, you can always reach out to your local Dell network team. I've got the same documents you do, and I've double-checked the info.
Hope that helps!
MediaComposer
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December 19th, 2024 06:27
Thanks! Perhaps you can file a request to correct the error.
While we're on the topic, can the S5248F-ON take 1Gb on any of its front ports (not the management port..)? I also found confusing information on that.