Cisco 3750 Switch out-of-box Config doesn't see upstream DHCP Server

[mrwithrow]

Hello

I have a simple setup that has somehow become an overwhelming problem that I can't seem to resolve. I have done this before so I know it works. I have approximately 8 SUN Servers that I need to setup in a test bed. All IP's will come from a remote DHCP server. I have assigned port gi 1/0/1 as my point of entry. basic config (out-of-box).  port is up/up however the port light is amber?? I have moved to several other ports and get the same response. Using a striaght through CAT5 connection to another Cisco Layer 3 device. I am relying on the default Cisco configuration vlan 1. This should work but its not. Yes the servers are setup for DHCP..So what am I doing wrong...

Thanks

[Nagaraja Thanthry]

What kind of device do you have upstream? Is it a switch? If yes, try configuring the port connecting to upstream device as a trunk port.

interface "interface id"

switchport trunk encapsulation dot1q

switchport mode trunk

exit

Hope this helps.

Regards,

NT

[mrwithrow]

Hello NT

This is an unmanaged device so I was hoping to just use the switch as a hub in order to pull IP addresses, I really did not want to setup trunking if possible.

[angus317]

Hi Mark,

If the port status is up/up, the port should be working. Amber light may indecate the port not running at it's best speed / duplex mode only. Also, you should check on the error counter on that interface & logs.

[mrwithrow]

Hello Angus

The port speed and duplex were set to auto/auto. I did try setting the port speed to 100 Mbps & 1 Gbps. I also changed the duplex settings as well. Didn't seem to matter. I did check the input and output couters. As I recall I believe the input counters are incrementing but the output counters are not. I know that doesn't make since but that was what I was viewing when I checked the gi 1/0/1 interface 

[angus317]

Hi Mark,

What I mean is, amber light no equal to error. Let's say your upstream device is a 10/100 switch, but your 3750's port is Giga port. auto / auto configuration will learn the speed / duplex as 100 / full & the light of that port become amber.

If you want to know a port having problem or not, you should look at the counter of the interface & system log. May be you can post the information below, which helping on investigate your problem:

show interface (both port connecting to your server & upstream device)

show log

show mac-address-table