Slow Fiber Ping for one School 1

[IdahoTech]

Hello All,

Ok we are a small school district in Idaho and we just had our own fiber laid through the district. So from our High School back to our Grammer School.

From 4 of the 5 schools I can ping my ftp box and server anywhere in the district and get a <1ms response time.

From one of the schools no matter where I am in the school I get <10ms. Shouldn't all of the pings from every school be consitant with eachother. All of those systems also in that school are hooked directly to the main switch that hooks the fiber between schools.

We have HP 2650's in each of the schools in between and at either end we have a 5308xl at one end and a 4308gl at the other end. Both with Fiber modules set at 1000.

Anyone have any ideas what could be causing this? Or why one school would be different but the other schools all ping the same.

Please let me know if anyone has any ideas.

Thanks

IdahoTech
'Only two things are infinite - the Universe and human Stupidity, and I'm not so sure about the Universe' Albert Einstein

http://www.sd60.k12.id.us

 

[LawnBoy]

I know you say you've checked it, but it sounds like the slow school may only be hitting the fiber with 100Mb. Or a possible duplex mismatch.

I've got a couple of 5308's and a 4104 and have been very happy with them.

Are you doing any LACP? How about STP?

 

[IdahoTech]

Well I just checked the ports and they are running at 1000LX and auto flow control. Now what they are hooked to on the other link for the fiber I will have to look into. LACP? STP? Don't see that in the configuration.

Forgive me for asking but what are those two that you listed for.

Thanks for replying I will check the other ports on the other switches that those hook to and see what they are set at.


IdahoTech
'Only two things are infinite - the Universe and human Stupidity, and I'm not so sure about the Universe' Albert Einstein

http://www.sd60.k12.id.us

 

[LawnBoy]

Link Aggregation Control Protocol is used to combine two fibers into a single link.
Spanning Tree Protocol will allow you to have redundant links standing by if the primary link goes out.

You can check the port speed and duplex settings by simply pointing your browser to the IP address of the switch. Lots of info in the switch's built-in webserver.

 

[IdahoTech]

Thanks for the info on what those two are. I checked the switch through the web interface as well as the switch that the fiber connection is coming from and the switch the fiber connection is going to. The only thing different on the one I was having problems and the others is that I saw flow control was on while on the other switches it was off.

I set it to the same for that problem switch. I know it is not a big thing, <10ms compared to <1ms ping time, but just trying to fine tune it.



IdahoTech
'Only two things are infinite - the Universe and human Stupidity, and I'm not so sure about the Universe' Albert Einstein

http://www.sd60.k12.id.us

 

[LawnBoy]

Lol, I may know what the problem is...

The shortest time ping will show from XP is <1ms
The shortest time ping will show from W2K is <10ms

There's a difference in timer resolution in the ping utility between XP and 2K.

 

[robertjo24]

In the future, when troubleshooting an supposed issue with the fiber, ping between the switches, not the machines behind the switches.

If you suspect the transport, always troubleshoot at the transport when possible.

 

[DanInRaleigh]

IdahoTech,

.did you find the problem?

...how bout some tracert or pathping commands to isolate between what device is the slow connetion...or was it you where using windows 2000 as lawnboy was mentioning..

..just trying to throw some ideas out there ...and learn..

CCNP,CCSP,MCSE,Sec+,Net+,A+...