Cisco 1900 Port Speed, help please.

[crzypony]

Hello, I just installed a cisco 1900, and it seems the port speed between 2 servers on the same switch are stopping at 1 mb/s. How do i change the configuration, or is there something i did wrong. All the settings are at default (i think)

Any and all help is appreciated.
thanks in advance
-john

 

[crzypony]

when i loaded up mrtg, it also said in the stats that the max speed was 1250.0 kBytes/s ?

-john

 

[hexn]

I doubt you did anything wrong. The port speed either negotiates at 10 or 100 Mbps, you really dont have much choice beyond that.

I would run a crossover between the servers back to back and transfer a large file between them and see what kind of speed you get and see if you can nail the problem to the switch.

I have found the most common problem with speed is a bad cable. If you bought the cables, then it probably isnt the cables, but if you made the cables, then I would make 2 more and replace one at a time and see if your performance improves. ~~~~~~~~~~

http://shnypr.com

tech@shnypr.com
~~~~~~~~~~

 

[jkeeper]

I would also check the cable, we purchase cables that said it was pre network certified, today I found five (5) that would not certify when tested (all ways test your cable yourself).

jkeeper

 

[BOKA]

I am new in the switch area, however, you are not confusing Mbps and MBps, are you?
For example, for CRZYPONY: 1250.0 kBytes/s == 10 Mbits/s (1 byte == 8 bits).

Good luck.

 

[wybnormal]

Actually, the most common problem I've seen is not cabling per say... it's the cable will not allow the switches to auto neg the connection so they spend more time talking to themselves then passing data.

Now.. with a 1900... there is NOT any auto neg on the first 12 or 24 ports.. they are 10 half and thats it. THe last two, ports A and B will flip 10 or 100.

On a 2900, you get 10/100 ports across the board and each can autoneg the connection.

A good rule of thumb is to lock all ports to 10 half to start UNLESS you can use something like a Pentascanner and certify the cabling from END TO END at 100Mhz( 100Mbps) and even then it might now work depending on the NICs being used. Almost every engineer gets bit at least once by flipping in a switch on auto and then having half the connections go away because they wont autoneg the connection properly.

MikeS Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[crzypony]

ok now i have a 2900 series and it says:

Max Speed: 12.5 MBytes/s



how come it dont say 10 mb/s or 100 mb/s.. or is this just a setting i am missing?