https://community.cisco.com/t5/discussions-de-data-center/issue-with-ndfc-appliance-connected-to-3750-x-switch/m-p/5237815#M266 <P>Hello,</P><P>In our datacenters, we have three physical NDFC appliances. Two of them are connected via 10G to 4510R&nbsp; and are working perfectly without any issues.</P><P>However, due to hardware availability, the third node is connected to a 3750-X switch with a <STRONG>C3KX-SM-10G</STRONG> module.</P><P>The problem is that the port comes up and shows as <STRONG>connected</STRONG>, but the MAC address of the appliance never appears in the MAC address table. If I move this appliance to another datacenter and connect it to a 4510R, it works immediately.</P><P>There are no errors in the switch configuration, and the GBICs and fiber are fine since they work when connected to the 4510R chassis.</P><P>For your information, I also tried using a <STRONG>C3KX-NM-10G</STRONG> module, but the symptoms remain the same.</P><P>So my question is: do these 3750-X switches or modules have limitations or restrictions when connecting servers/appliances? I’m running out of ideas at this point.&nbsp;</P><P>Thank you for your help, and have a great day.</P> Tue, 17 Dec 2024 08:19:16 GMT Bono1307 2024-12-17T08:19:16Z https://community.cisco.com/t5/discussions-de-data-center/issue-with-ndfc-appliance-connected-to-3750-x-switch/m-p/5237815#M266 <P>Hello,</P><P>In our datacenters, we have three physical NDFC appliances. Two of them are connected via 10G to 4510R&nbsp; and are working perfectly without any issues.</P><P>However, due to hardware availability, the third node is connected to a 3750-X switch with a <STRONG>C3KX-SM-10G</STRONG> module.</P><P>The problem is that the port comes up and shows as <STRONG>connected</STRONG>, but the MAC address of the appliance never appears in the MAC address table. If I move this appliance to another datacenter and connect it to a 4510R, it works immediately.</P><P>There are no errors in the switch configuration, and the GBICs and fiber are fine since they work when connected to the 4510R chassis.</P><P>For your information, I also tried using a <STRONG>C3KX-NM-10G</STRONG> module, but the symptoms remain the same.</P><P>So my question is: do these 3750-X switches or modules have limitations or restrictions when connecting servers/appliances? I’m running out of ideas at this point.&nbsp;</P><P>Thank you for your help, and have a great day.</P> Tue, 17 Dec 2024 08:19:16 GMT https://community.cisco.com/t5/discussions-de-data-center/issue-with-ndfc-appliance-connected-to-3750-x-switch/m-p/5237815#M266 Bono1307 2024-12-17T08:19:16Z