Intemittent network disconnectivity

[drmohlen]

I was wondering if any one can help me to solve our intermittent network problem.

We have a Cisco 2970 GB switch which all servers including exchange server 2003 are plugged into and also have 3 Cisco 2950 48 port which they all linked up using cross over cable and clients machines are plugged into.

The problem is every so often the outlook on the client loses its connection to the exchange server intermittently. The problem does not happen to all users, it does happen to few users more frequent than others. We only lose connection to the exchange server and no other servers and when the connection drops I can not ping the Exchange server nor can I ping any devices from the exchange!!

It is a bizar behavior and can not put my finger on it, I have changed the NIC on the Exchange server but the problem still occurs!

Any suggestion or ideas would be greatly appreciated.

 

[techcontroller]

I would take a look at the config on the switch and make sure your port speed is appropriately set. By this I mean make sure that it is set to 100/1000 either auto or full, or what ever your exchange server requires. I experienced this once with one of our exchange servers. Half the users on the switch were set to 10 half-duplex. This caused a lot of connectivity issues with those users.

 

[drmohlen]

Here is the result of show interface status command from the cisco2970 which the exchange server port is Gi0/17 port.

The NIC speed on the exchange server is set to Auto Detect.

Port Name Status Vlan Duplex Speed Type
Gi0/1 connected trunk a-full a-1000 10/100/1000Ba
seTX
Gi0/2 connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/3 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/4 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/5 connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/6 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/7 connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/8 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/9 connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/10 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/11 connected 1 a-full a-100 10/100/1000Ba
seTX

Port Name Status Vlan Duplex Speed Type
Gi0/12 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/13 connected 1 a-full a-100 10/100/1000Ba
seTX
Gi0/14 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/15 connected trunk a-full a-1000 10/100/1000Ba
seTX
seTX
seTX
Gi0/17 Exchange server connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/18 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/19 connected 1 a-full a-1000 10/100/1000Ba
seTX
Gi0/20 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/21 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/22 notconnect 1 auto auto 10/100/1000Ba
seTX
Gi0/23 connected 1 a-full a-100 10/100/1000Ba
seTX

Port Name Status Vlan Duplex Speed Type
Gi0/24 connected trunk a-full a-1000 10/100/1000Ba
seTX
Gi0/25 notconnect 1 auto auto Not Present
Gi0/26 notconnect 1 auto auto Not Present
Gi0/27 notconnect 1 auto auto Not Present
Gi0/28


If you think I need to change speed on the port can you please let me have the cisco command on how to change it.

 

[NettableWalker]

I had similar problems with clients randomly disconnecting for a fraction of a second. Manualyl setting the port speeds ect certainly helped alot.

Do "Show log" and see if there are UP/DOWN errors where certain ports go up and down.

To change the port settings just type:

config t
interface gi0/1
speed 100
duplex full


or whatever

MCP,CCA,CCNA, Net+, Half CCNP...

 

[drmohlen]

Thank you for the reply, do I need to apply this method to all the ports for all servers, and desktops on all switches or only to the port to which exchange server is uses?

 

[NettableWalker]

Your choice entirely. See which ports are casuing problems and then change those if necessary. or if all the ports are connected to things which use 100MB Full duplex then just change them all.

To do lots of ports at a use this command: (keep the spaces)

interface range gi0/1 - 24



MCP,CCA,CCNA, Net+, Half CCNP...

 

[drmohlen]

Thank you I have made the changes to the port used by exchange server and it appears to fixed the problem.

Thanks again