SNMP-3-CPUHOG with getnext of lldpRemEntry

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Aug 9th, 2010
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My 3750 stack running ipservicesk9-m 12.2(53)SE is heavily loaded at times, and the log shows that it is the snmpengine that causes the load.

%SNMP-3-CPUHOG: Processing GetNext of lldpRemEntry.6.0

and that this task has been running for some time and that it is the "process = SNMP ENGINE".


The switch is running a pretty simple configuration, with 10 vlans, one ospf process and 5 of the 2x12 interfaces in use.  All the ports are trunks to other switches.   2 of the ports are trunks allowing only one vlan for the routing to the core router, one of this trunks are forwarding and the other are blocking.

There are noe specific snmp configuration, only 2 lines:

snmp-server community xxxxxxx RW 1

snmp-server community yyyyyyy RO


I've been trying google for similar problems, but not sure what causes this.

Can anyone give some help understanding this problem and solve it?


Br

Sand-Strand

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jorge.calvo Tue, 08/10/2010 - 00:24
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Hello,


Please check this IOS bug details to see if all of them match your issue:


CSCtg62793:



Traceback on 3750 for lldpRemEntry
Symptom:
See system message set like:

%SYS-3-CPUHOG: Task is running for (2111)msecs, more than (2000)msecs (78/44),process = SNMP ENGINE.
2010-04-27 16:19:01 - 10.60.4.52 - 122: -Traceback= 1755588 1755640 1752508 172B6C8 172B704 18ABA64 18A9D54 28FCDEC 28D0A28 28C1390 28EC158 1B8ADCC 1B81858

%SNMP-3-CPUHOG: Processing GetNext of lldpRemEntry.8.0


Conditions:

3750 stack running image c3750-ipservicesk9-mz.122-53.SE.bin

Workaround:

Create an snmp-server view blocking this portion of the mib tree or the LLDP-EXT-MED-MIB that contains it ie

snmp-server view cutdown iso included
snmp-server view cutdown 1.0.8802.1.1.2.1.5.4795.1.2.1 excluded

or

snmp-server view cutdown 1.0.8802.1.1.2.1.5.4795 excluded


and then to apply it :

no snmp-server community < your string here> RO 1
snmp-server community < your string here> view cutdown RO 1
pd.politiet.no Tue, 08/10/2010 - 01:34
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Thanks for the quick reply.  After some tries, and finally used the correct mib, it seems to work.  This is the config I ended up with:


snmp-server view cutdown 1.0.8802.1.1.2.1.4.1.1.6.0 excluded

snmp-server community xxxxxxxx view cutdown RO 1

Thanks again!


Br

Sand-Strand

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