Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

3750X performance issue


We have stack of 3 3750-X switches.

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 54    WS-C3750X-48       12.2(55)SE1           C3750E-UNIVERSALK9-M
     2 54    WS-C3750X-48       12.2(55)SE1           C3750E-UNIVERSALK9-M
     3 54    WS-C3750X-48P      12.2(55)SE1           C3750E-UNIVERSALK9-M


We are facing performance issues for traffic passing through this switch. We dont see packet drops on trunk interfaces but still file upload/download through this switch is slow and varies significantly.


We tried disabling QoS but performance is still same. Tried flow control but of no use.

Can anyone suggest what could be cause?


Cisco Employee

There's 3 separate numbers to

There's 3 separate numbers to look at when dicussing routing performance:


1) Max packets per second

2) Max throughput

3) Max number of routes


#1 is pretty easy to find, and will greatly influence #2.  However, packet size also comes in to play.  Some will want to do the calculations with a very small packet size (64 bytes), while others like to assume something in the middle like 512 or the max normal size which is 1500.


#3 is usually dependent on platform and in some cases the license level.  Switches are usually limited to a few thousand routes, so using them as Internet routers running BGP is a problem.


You should be able to find these on the data sheet -

CreatePlease login to create content