3750-48 PoE

Unanswered Question
Jan 5th, 2009

3750 runs low memory too often. The current memory is 128MB. Switch almost fully populated with ip phones/PCs. Is this an IOS bug? Running IOS is C3750-IPSERVICES-M), Version 12.2(25)SEE3

I have this problem too.
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Giuseppe Larosa Mon, 01/05/2009 - 01:44

Hello Keith,

use sh proc mem to see what processes are using the memory.

Have you got any routing protocol running on it ?

Security measures like Dynamic ARP inspection, DHCP snooping and so on ?

802.1X ?

If the switch is used as a simple L2 switch with no additional features it should be fine and quiet about memory.

If this is the case I would think of an IOS upgrade to 12.2(46)SE or 12.2(44)SE.

Hope to help

Giuseppe

keithmatsepe Mon, 01/05/2009 - 01:56

Giuseppe,

We're using the switch as L3 and running the following on the:

OSPF

802.1x

AAA - Radius/Tacacs

L3 Portchannels

ACLs

MQC

And that's pretty much what we running on the box.

Perhaps i should ugrade to later IOS.

Giuseppe Larosa Mon, 01/05/2009 - 02:01

Hello Keith,

how many OSPF routes are in the db ?

use

sh ip ospf summary

if in the order of thousands you should think to put it in an OSPF stub area but you likely have already it in a stub area.

if you like you can post the sh proc mem to see what are the processes that uses more memory.

Copy it to a text file with .csv extension import it in a spreadsheet and order based on memory usage

(I don't rembember is a sh proc mem sorted option exists)

Hope to help

Giuseppe

keithmatsepe Mon, 01/05/2009 - 02:50

Giuseppe,

My area is stub and I have less than 100 routes in the db. See the top memory users on the switch below,

HRPC qos request

HQM Stack Proces

RedEarth Tx Mana

Hulc LED Process

*Init*

SNMP ENGINE

And just for interest sake , there is no command sh ip ospf summary, but sh ip ospf summary-address.

Giuseppe Larosa Mon, 01/05/2009 - 03:03

Hello Keith,

sorry for the mistake

the right command should be

sh ip ospf database summary

However, OSPF is not an issue in your scenario.

I would go for an IOS upgrade

Hope to help

Giuseppe

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