Network bottleneck?

Castlewood
Castlewood used Ask the Experts™
on
Hi Experts,

We just upgraded our LAN switches from 100 to 1000 baseT yesterday. We have only about 45 clients so we piled two HPv1810-48G together. We basically connect all servers-alike to the Switch1 and all clients to the Switch2:
Switch 1: all servers, internet connection, printer servers, MPLS/VPN connection, etc
Switch 2: all clients
(Between two switches is connected with a CAT6e cable)

After the upgarde we got two issues I am so puzzled about:
  1. My internal LAN users experience an improved speed after the change of using GB switches but my remote MPLS users complain about the even worse speed while accessing the servers. How could that happen?

  2. I ran speakeasy.net/speedtest and found the download is normal (average 4.2 mpbs, we have 3T) but the upload is miserable (only 0.8 - 1.8 mpbs). If I change my computer to use the old 100baseT switch with uplink back to Switch1, I can get as high as 2.0-3.0 mpbs upload. How could this happen?

I just cannot explain. ISP said they don't see any issue at their side. Can you see anything wrong with my opology? Could it be something wrong with the hardware -- GB switches as they are pretty inexpensive? or Could it be because of some kind of bottleneck?

Can you shed some light on this?
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Have you checked the QOS settings on the HPv1810?

Author

Commented:
How?
please help.
bbaoIT Consultant

Commented:
> my remote MPLS users complain about the even worse speed while accessing the servers.

first try PING and TRACERT commands to determine the latency and the routes running through, see if the results are normal as expected or before.

> If I change my computer to use the old 100baseT switch with uplink back to Switch1, I can get as high as 2.0-3.0 mpbs upload.

any difference between the uplinks of old FE switch and new GB switch??
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Commented:
Perhaps you have a problem with auto-negotiation of speed and duplex - between the new switch and what ever firewall/router you have to connect to internet and MPLS VPN sites.

First you want to figure out what was negotiated, and possible you want to remove autonegotiation, and set tit to fixed 100 or 1000 and full duplex.

You can also check those ports for errors, which could be a symptom of negotiation problems.
Syed_M_UsmanSystem Administrator
Top Expert 2011

Commented:
Dear,

please look @ http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02879282/c02879282.pdf

and for testing purpose change 1port (connected to mpla router) to 100FDX — 100Mbps, full-duplex
 and try....

Author

Commented:
Thank you for the replies.
You are talking about changing the speed/duplex for the ports on the switches to MPLS router and Firewall, correct?

How about on the firewall? The firewall outside port is set as auto/auto while the inside port is 100/Full duplex. Do I need to change for this outside?

(I already changed the MPLS router to have 100/Full but the issue remains.)

Please help.

Commented:
You have not told us what connects to what (firewall, router), but essentially you should look at the equipment connecting to the switches.

Commented:
And obviously, also configure those switch ports.

Author

Commented:
Basically, both the MPLS router and the Firewall connect to the same switch.

Author

Commented:
So the current auto/auto on the Firewall outside port is fine? since it doesn't connect to my switches.

Commented:
Yes, it is only the ports that connect to the new switches that need investigation, and change. And the switch ports themselves.

Author

Commented:
Seems like we want to avoid the auto/auto in this case. Does it mean the auto negociation take time and waste time?

Commented:
Sometimes auto negotiation does not work between equipment from different vendors.

Sometimes it does not even work between equipment from the same vendor...

Author

Commented:
If that is the case, then between my Switch1 and Switch2 is connected with a Cat6 cable. Shall I change the two connected ports to have 100/FDX instead of default auto/auto?
please advise. Thanks.

Commented:
I assume you have 1000 there and not 100.

Anyway, switches of the same model and software version should not have a problem negotiating with each other.

Generally, would you could consider between the two switches is to configure a link aggregation group, with perhaps 4 parallel ports/links so that you would get 4Gbps capacity between the switches. However, that's for later. Let's fix the problem first.
bbaoIT Consultant

Commented:
> Anyway, switches of the same model and software version should not have a problem negotiating with each other.

per my experience, nowadays most devices made in recent years should not have a problem negotiating with each other.

Author

Commented:
It ended up the Auto or 100 just needs to be the same (auto - atuo or 100 - 100) between the IAD and the switch or between ASA and the switch.

thank you very much.

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