Cisco 3750X -- 10G uplink - Can be used as access port?

[abhisar patil]

Dear All,

I have small question, I am planning for Cisco 3750X with 10G SFP+ service module. I want to know that whether it can be used as Access Ports connecting to server as this is mostly used as uplink port.

Thank You,

Abhisar.

[Karsten Iwen · Accepted solution]

you can connect whatever you want as long as the connected system supports the same medium/standard.

[Jose Solano · Accepted solution]

Hi,

See this:

10-Gigabit Ethernet Network Module

The C3KX-NM-10GT 10-Gigabit Ethernet Network Module has two 10-Gigabit Ethernet copper port that can operate at either 1 Gigabit per second or 10 Gigabits per second. To configure the port speed to 1 Gigabit per second, use the hw-module switch global configuration command. See the command reference for command syntax description.

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Note 10 Mb/s and 100 Mb/s speeds are not supported on this module.

That said it should work as an access port as long as you follow those guide lines.

Regards,

[abhisar patil]

Dear Karsten/Leo,

Thank you for your promt response.

I will be going for C3KX-NM-10G which has 2*10G SFP+ and 2*1G SFP and connecting two servers having 10G optical card.

Thank you again

Thank You,

Abhisar.

[Joseph W. Doherty]

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Posting

Well if you want to connect anything with 10g to a 3750X, you're limited to using a module with 10g ports. 

Other than 10g capability on some module cards, something to note, the module ports, I believe, are supported by larger buffers (including the gig module ports).

As the others have noted, you can use any port for any purpose.  However, if you connect a server to a 10g port, be aware you might start to see drops on your other host (gig) ports as the server will now be able send faster than the host port can receive data.  To minimize this, you might either disable QoS on the switch (providing maximum buffers to all egress traffic) or you might need to tweak buffer resource settings (the default settings often drop some packets, when there are bursts, of default marked packets).

[abhisar patil]

Dear Joesph,

Thank you for your reply.

We are not  doing any QOS in network, we will be focousing on communication between  two servers(5 VMs on each) having 10G connectivity connected to switch.

Also can you share any doc or commands to tune buffer resource to avoide any packet drops.

Thank You,

Abhisar.

[Joseph W. Doherty]

Also can you share any doc or commands to tune buffer resource to avoide any packet drops.

https://supportforums.cisco.com/docs/DOC-8093