2924XL process memory IP SNMP holdin

h.cox · ‎02-01-2010

Hello

This 2924 switch is reporting very high process memory usage. I cannot help noticing that holding column of show proc memory is highest for the IP SNMP usage.

Is it normal for IP SNMP to require a lot of memory or could it be a memory leak?

xxxxxxxxxx#show proc mem
Total: 3779364, Used: 3229356, Free: 550008
 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
   0   0      48800       1504     394160          0          0 *Init*
   0   0       1680    9178808       1680          0          0 *Sched*
   0   0   21204200   18959200     988044    1099092     510632 *Dead*
   1   0        268        268       3836          0          0 Load Meter
   2   0     114548       9420       6900      13608          0 TACACS+
   3   0          0     114964       6836          0          0 Check heaps
   4   0      20248          0      27084          0          0 Chunk Manager
   5   0         96      12288       6932          0      34480 Pool Manager
   6   0        268        268       6836          0          0 Timers
   7   0         96          0       6932          0          0 Entity MIB API
   8   0        180        168       7016          0          0 ARP Input
   9   0       8688        268      15256          0          0 Enet Aging
  10   0         96          0       6932          0          0 Critical Bkgnd
  11   0     208692     179288      15916          0          0 Net Background
  12   0      17392        268      18524       9072          0 Logger
  13   0        268        268       6836          0          0 TTY Background
  14   0 1878063884 1380815372       6836          0          0 Per-Second Jobs
  15   0        192          0       7028          0          0 Net Input
  16   0        268        268       6836          0          0 Compute load avg
  17   0          0    3404688       6836          0    7923888 Per-minute Jobs
  18   0 3456702528 2114128928       7980       1560          0 LED Control Proc
 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
  19   0          0          0       3836          0          0 RAM Access (dm 0
  20   0 1142765272  655434380       8616        780          0 Port Status Proc
  21   0        244          0       7080          0          0 VM Prune Events
  22   1     345932     335704      16004          0          0 Virtual Exec
  23   0  902685460  902685252       3908          0          0 GDS Frame Ager
  24   0          0          0       6900          0          0 IP NAT Ager
  28   0          0          0       3836          0          0 RAM Access (dm 1
  30   0 2724120940 1104215440       7308          0          0 Broadcast Storm
  31   0         96          0       3932          0          0 Port Group Chang
  33   0        428     339296       3932          0          0 Address Learning
  34   0          0          0       3836          0          0 RAM Access (dm 2
  35   0 4200168060 3851135040      22936       1560          0 Enet Aging
  36   0    1436732    1073380      15716          0          0 IP Input
  37   0         96     389268       3932          0          0 Address Deletion
  38   0  177488308  168629860      18528    6355440          0 CDP Protocol
  39   0        588        268       7156          0          0 UDLD
  40   0      14748       5332      12416          0          0 Switch CGMP Prot
  41   0      22804      15504      20892          0          0 VLAN Manager
  42   0          0     695688      12836          0          0 TCP Timer
  43   0   10425424     425908      14488          0          0 TCP Protocols
  44   0          0          0       6836          0          0 Socket Timers
  45   0          0          0       6836          0          0 HTTP Timer
 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
  46   0        244          0       4080          0          0 CGMP Forwarding
  47   0        364        268       6932          0          0 Cluster L2
  48   0         96          0       6932          0          0 Cluster RARP
  49   0       1156        600       7392          0          0 Cluster Base
  50   0       4524      13972       7600        780          0 Spanning Tree
  51   0        420        268       3988          0          0 STP Hello
  52   0      50076        268      20548      14040          0 STP Queue Handle
  53   0        328      12592       6996          0          0 Malibu STP Adjus
  54   0          0          0       6836          0          0 Time Range Proce
  55   0         96          0      12932          0          0 SNMP ConfCopyPro
  56   0      12176      13592       3932          0          0 Bridge MIB traps
  58   0        268        268       3836          0          0 Runtime diags
  59   0          0          0       6836          0          0 SNMP Timers
  60   0 1829583108 1828522940    1319796          0          0 IP SNMP
  61   0         96          0      12932          0          0 SNMP Traps
  62   0       1416        268       7984          0          0 NTP
  63   0  117924192  115566088      15236    1261008          0 BootP Resolver
  64   0     254088     142812       7168          0          0 AAA Accounting
                                  3228952 Total

Reza Sharifi · ‎02-01-2010

Hi H,

Take a look at this doc regarding high CPU with SNMP engine and how to mitigate it.

http://www.ciscosystems.ro/en/US/tech/tk648/tk362/technologies_tech_note09186a00800948e6.shtml

HTH

Reza

h.cox · ‎02-02-2010

Thanks

It was process memory usage rather than high CPU utilisation that I was concerned about.

Giuseppe Larosa · ‎02-01-2010

Hello,

what IOS image is running on the device?

We experience a different problem that they become unreachable at L3 (no telnet possible, no ping) but they are still acting as L2 switches.

Hope to help

Giuseppe

h.cox · ‎02-02-2010

12.0(5.2)XU Maint Rel

h.cox · ‎02-08-2010

The following bug is a memory leak in in IP SNMP. That might be what I am hitting. Unfortunately, none of the fixed-in versions give are available for the 2924XL switch.

h.cox · ‎02-08-2010

The bug I meant to say in my previous post was:

CSCds06656 Bug Details Bug #3 of 3 | < Previous | Next >
memory leak in MakeOctetString() for various get
Problem Description:

Router may experience memory leak in IP SNMP or other processes using
MakeOctetString()

Conditions:

Problem may appear during normal operating conditions when a process
using MakeOctetString()

Possible Workaround:

Disable SNMP or orther process using MakeOctetString()
Status
Fixed
(Resolved)
Severity
3 - moderate

Last Modified
In Last month

Product
Cisco IOS software

Technology

1st Found-In
12.1M
12.0(4)T
12.0(5)T1
12.1T
Known Affected Versions

Fixed-In
12.1(4.1)M
12.0(12.6)SC
12.1(3a)EC1
12.1(4)DB
12.1(4)DC
12.1(4)DC1
12.1(4.0.3)PI
12.1(4.0.3)T
12.1(4.3)PI
12.1(4.4)E
12.1(4.4)EC

Component(s)
ubr7200
Related Bug Information
Processor memory leak in SNMP MakeOctetString
A Cisco router running 12.0(4)T or later 12.0 T code that has Simple
Network Management Protocol (SNMP) configured may experience a slow
memory leak in Processor memory. Workaround: Disable SNMP.