Port speed settings go away when SFP is inserted - Catalyst 9500

[redgasgiant]

Is it normal behavior for the speed and duplex settings to go away when an SFP is inserted into a TwentyFiveGig port? I'm not using an official Cisco brand SFP so I thought maybe these FS.COM 10gig sfp units aren't working as intended. Catalyst 9500 24y4c

    

[DanielP211]

Hello,

Do the SFP's show under show inventory? You cannot "change" the speed, if the devices are connected. Also which version are you running on the 9500?

You should check this bug:
https://bst.cisco.com/bugsearch/bug/CSCvq13419

BR

[Leo Laohoo]

SFP always have one speed and duplex setting is always "full" therefore it makes no sense to enable the speed/duplex settings in CLI &/or GUI.

[redgasgiant]

 They do show up in inventory. And I'm running Bengaluru 17.6.x I just got these things unboxed last week. 

So how then are these https://www.fs.com/products/36351.html 10g SFPs negotiating to 1g ? 

For example I have a 1g capable industrial switch and I have it connected to a cisco SG350X via the 10g SFP+ ports. 

Both ends of that connection are using the same 10g optics as I linked to above. But the SG350X is able to autonego down to 1g on the SFP+ port XG1.( and I can manually set it)  So, I it's possible that these 10g SFPs can operate at 1g. 

When I attempt to connect the 1g industrial switch to the catalyst 9500 it doesn't work unless I use the old 1g optics I have laying around. 

[redgasgiant · Accepted solution]

This answers my question! I guess you don't get some basic features with $12,000 switches! 
Table 1. Default Layer 2 Ethernet Interface ConfigurationFeatureDefault Setting

Operating mode	Layer 2 or switching mode (switchport command) for C9500-12Q-E, C9500-12Q-A, C9500-24Q-E, C9500-24Q-A, C9500-40X-E, and C9500-40X-A models of the Cisco Catalyst 9500 Series Switches. Layer 3 or routed port for C9500-32C, C9500-32QC, C9500-48Y4C, and C9500-24Y4C models of the Cisco Catalyst 9500 Series Switches
Allowed VLAN range	VLANs 1 to 4094.
Default VLAN (for access ports)	VLAN 1 (Layer 2 interfaces only).
Native VLAN (for IEEE 802.1Q trunks)	VLAN 1 (Layer 2 interfaces only).
VLAN trunking	Switchport mode dynamic auto (supports DTP) (Layer 2 interfaces only).
Port enable state	All ports are enabled.
Port description	None defined.
Speed	Autonegotiate. (Not supported on the 40-Gigabit interfaces.) The C9500-32C, C9500-32QC, C9500-48Y4C, and C9500-24Y4C models of the Cisco Catalyst 9500 Series Switches do not support autonegotiate. Their speed is determined by the type of transceiver module plugged in.
Duplex mode	Autonegotiate. (Not supported on the 40-Gigabit interfaces.) The C9500-32C, C9500-32QC, C9500-48Y4C, and C9500-24Y4C models of the Cisco Catalyst 9500 Series Switches support full duplex mode.