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RMON Table size

Can anyone tell me how to increase the size of the RMON tables on a cat running cat o/s. I have a user that gets hundreds of syslog messages that are telling him his RMON table is full. I have advised him on how the remove the RMON entires but this doesnt solve the problem.

TIA

  • Other Network Infrastructure Subjects
1 REPLY
Cisco Employee

Re: RMON Table size

Are you seeing errors like the following?

SYS-3-SYS_RMONMEMLOW:Fail to allocate memory for RMON. System

memory usage excess 85%

The default RMONmemory allocated is 85% and is configurable

http://cio.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_6_3/cmd_ref/setsn_su.htm#50850

But these errors are likely being caused by one of 3 things

1) insufficient memory for features/utilization

2) memory leak..Take a look at the following bug

http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdx19098

3) Rmon config conditions

Basically, there is a memory limit on all of our switches as far as how many buckets can be allocated for short and long term history (ie not capable for all ports). Therefore you will get the error that you are running into if you are

getting buckets for history on too many ports. This is outlined in the doc

below...and in the command guides for the switches.

http://www.cisco.com/warp/public/701/25.html

With respect to RMON, because you are using a switch and not a switch probe you will only be able to collect mini- RMON stats. This includes alarms

and events and you can configure as seen in the following links:

Configuring Alarms:

http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/sw_ntman/td_main/td_5_6/traf5_6/alarms.htm

Mini-RMON

http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/sw_ntman/td_main/td_5_6/traf5_6/switches.htm

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