Network Speed

[thebdj]

Bit of an open question so I do apologise.

Basically from one site, a computer going through an Intel Switch to a Cisco 2621 which is connected to a Cisco 3620 via a 100Mbps LES connection which in turn is connected to another Intel Switch which connects to the server ...

is much much slower than

a computer going through an Intel Switch to a different Cisco 2621 which is connected to a Cisco 3640 va a 100 Mbps direct fibre connection which in turn is connected to the Intel switch which connects to the server as mentioned before.

Is there something there that might explain why or does anyone have any ideas. I'm a bit stumped. I'm a bit of a junior in the network world and my troubleshooting is a bit weak. I keep looking forthings like huge amounts of broadcasts and too many runts/giants/babbles and other bad packets.

Can anyone help me?

Cheers
Justin

 

[tiremd]

Just a quick idea...make sure the speed and duplex settings are set to the maximum on the ethernet connections, don't leave it up to auto.

 

[thebdj]

All set as you said. Just a quick question as well. Is there actualy a great deal you can get from just looking at a few 'show running-config' files. Isn't something like a Network Performance Monitor a must-have to answer ambiguous questions such as these?

Cheers
Justin

 

[tiremd]

You can get a ton of information from 'show' and 'debug' commands if you use them properly.... especially 'show interface' commands to look at buffers and error rates. Network Performance Monitor is also helpful, but certainly not required to solve such issues.

2621's both have same IOS and memory levels?

 

[thebdj]

The one on the 'slow' side has 28672K/4096K bytes of memory and 16384K bytes of processor board System Flash.

The one on the 'quicker' side has 26624K/6144K bytes of memory and 8192K bytes of processor board System Flash.

I'd love to learn how I could use the debug tools and things to my advantage. I know the information is there, I just need to know how to read it

Appreciate your help.

Justin

 

[Andyleates]

Perhaps also you should check with BT what you can realistically expect from your Lan Extension Service as I have had a LES100e for a couple of years and you certainly can't expect to see 100Mbps bandwidth...

Andy Leates MCSE CCNA MCP+I

 

[thebdj]

Thankyou for that comment. I was wondering if the 100Mbps LES and the 100 Mbps direct fibre connection were realy operating as equals. I will speak with BT and get them to provide some information to me.

Cheers buddy
Justin