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i badly need help re network traffic
rdmatining May-15-02 08:31 PM
i am richard, from the philippines. im inexperienced when it comes to network. im a developer and does know a bit about databases. i am task to solve the company's network traffic but i dont have any idea where to start. i tried looking first at the source codes of the application then the database structure and configuration, but seems to be ok. then i tried looking at their network architecture. we 250 users 8-10 servers connected to each other on a single segment. could somebody help me locate the main cause of the traffic? thank you very much.

1. RE: i badly need help re network traffic
DJ Net2Infinity May-15-02 09:28 PM
In response to message 0
What operating system do you run?

2. RE: i badly need help re network traffic
Twinhead May-16-02 05:15 AM
In response to message 0
LAST EDITED ON May-16-02 AT 05:32 AM (EST)
 
You can try the following:

At first: So many Servers at ONE segment is most likely the couse!

Ask ALL users to terminate their processes, save the data, logoff their systems and shut them down. (At weekend?)
ALL the workstations (NOT THE SERVERS!!) must be down!

Goto the patchroom(s) and see on the Switches (Or Hubs) if there is still much traffic.
If so, pull out ONE patch-cord at a time who has still an Link led burning.
See in the ACT leds if traffic deminishes or stops.
Put it back in after a few seconds and try the next one.

If you have coupled Switches and/or Hubs in Cascade, VERIFY THAT THIS IS WITH ONE CABLE ONLY!!
Connecting two Switches / Hubs together with more than one cable will couse a massive traffic loop. (You can actually destroy the ports where the cables are conected to)

If all turns to be correct, and there is still much traffic, do the next:

Down the Server(s), and shut down ALL the Hubs and Switches (Or as to say ALL components in ALL patchrooms) by unplugging them from the power.

Leave it for about 15 minutes.

Then, Repower ONLY the Switches and Hubs.
See if there is traffic on them.
If so, there could be a malfunctioning patch-cord or a malfunctioning port in a Switch or Hub.
Switch cables between ports to see if there is a difference in traffic.
If no change, exchange a Patch-cord with a NEW or KNOWN GOOD one.
If no difference, preplace the original, and retry another one.
(Obvously test only the ones who have an Link led burning)

If done, wether luck or not, Restart the Server(s)
If not better, get an Network Engeneer!

Switches and Hubs are connected together with ONE cable only, NOT Daysy chain them, as this will couse also much traffic!!


Example of my way to connect them as a Starpoint I assume Switches by default, Substitute Hub if needed.
This is my faforite way to connect hem:


4 Switches/hubs and their linkup:

Switch 1`(most on top)
port 1: Main Server (Straight thru cable)
Port 2: Port one of Switch 2 (Cross cable), First lower Switch
Port 3: Port one of Switch 3 (Cross cable), Second lower Switch
Port 4: Port one of Switch 4 (Cross cable), Third lower Switch
The rest of the ports are for the additional Servers, AND all 1st ports for Workstations.

Switch 2
Port 1: Comes from Switch 1 Port 2
Port 2...24: Workstations.

Switch 3
Port 1: Comes from Switch 1 Port 3
Port 2...24: Workstations.

Switch 4
Port 1: Comes from Switch 1 Port 4
Port 2...24: Workstations.

... And so on

Data:

Straight Thru cable, BOTH ends!

(A-type)
1 White/Green
2 Green
3 White/Orange
4 Blue
5 White/Blue
6 Orange
7 White/Brown
8 Brown

Crossover cable, ONE end is the A-type, The other is the B-type

(B-type)
1 White/Orange
2 Orange
3 White/Green
4 Blue
5 White/Blue
6 Green
7 White/Brown
8 Brown


3. RE: i badly need help re network traffic
Flavah May-19-02 04:37 AM
In response to message 2
"Down the Server(s), and shut down ALL the Hubs and Switches (Or as to say ALL components in ALL patchrooms) by unplugging them from the power.

Leave it for about 15 minutes.

Then, Repower ONLY the Switches and Hubs.
See if there is traffic on them.
If so, there could be a malfunctioning patch-cord or a malfunctioning port in a Switch or Hub."

The switches could be running STP (Spanning Tree Protocol) which will result in traffic even with no devices attached.

Depending on your apps it could be an excessive amount of hosts on a single segment. You need to do some traffic analysis.
Make sure you don't have any protocols running that you don't need.
Check to see if there are excessive or un-needed broadcasts being sent out from any machines.

It takes a big man to cry, but it takes a bigger man to laugh at that man.


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