[c-nsp] Error Msgs - SYS-4-CHUNKMALLOCFAIL - arp throttle

[Rodney Dunn]

CSCsj25679
Externally found moderate defect: Resolved (R)
%SYS-4-CHUNKMALLOCFAIL: Could not allocate chunks for CEF: arp throt

should be fixed in 12.4(17).

It can be safely ignored. 

In the fix the error message you see is simply backed out.

Rodney



On Tue, Sep 04, 2007 at 01:11:21PM -0400, Bob Tinkelman wrote:
> > Cisco 3825 showing the following errors - looking for input...
> 
> (your error log quoted below my signature)
> 
> 
> We saw the same think on a cisco 7206-vxr with npe-t1 (1 gig memory)
> running c7200-jk9su2-mz.124-16, and with lots of memory always available.
> 
> We found a reference to "arp throttle", which appears to be a method
> to deal with a flood of packets to a non-existent address in a way
> that keeps it from turning into a flood of ARP requests on a directly
> connected net.
> 
> The error message line starting with "Total free: 0" makes it seem like
> there is a hard limit of 500 "somethings".  It's not clear to me what
> that is.  (Unanswered, not yet timed-out ARP requests?)
> 
> >From our router:
>   | #sh mem summ | inc arp throttle
>   | 0x6148AA98 0000002092 0000000001 0000002092    CEF: arp throttle chunk
>   | 0x6148AA98 0000016000 0000000001 0000016000    CEF: arp throttle chunk
> 
> So there doesn't appear to be a lot going on there.
> 
> We'd guessed that we were seeing periods where there were a high number
> of incoming probes trying to scan some of our directly attached LANs,
> but we have not done any further investigation.  (Mostly, it hasn't
> seemed to cause a problem yet, and so...)
> 
> I'd also be interested if anyone has any further insight.
> --
> Bob Tinkelman          <bob at tink.com>
> ISPnet, Inc.  http://www.ispnetinc.net
> 
> 
> 
> 
> > Aug 31 13:13:36: %SYS-4-CHUNKMALLOCFAIL: Could not allocate chunks for CEF:
> > arp throt
> > Total free: 0, Total inuse: 500, Cause : Not a dynamic chunk
> >  -Process= "<interrupt level>", ipl= 1, pid= 87 -Traceback= 0x612B36C4
> > 0x6002CA54 0x6002CAB8 0x615F1CD0 0x6005E8D8 0x60057CD0 0x60A15770 0x60A18448
> > 0x602CD374 0x60AFD9B8
> > Aug 31 13:15:35: %SYS-4-CHUNKMALLOCFAIL: Could not allocate chunks for CEF:
> > arp throt
> > Total free: 0, Total inuse: 500, Cause : Not a dynamic chunk
> >  -Process= "<interrupt level>", ipl= 1, pid= 87 -Traceback= 0x612B36C4
> > 0x6002CA54 0x6002CAB8 0x615F1CD0 0x6005E8D8 0x60057CD0 0x60A15770 0x60A18448
> > 0x602CD374 0x60AFD9B8
> > Aug 31 13:19:19: %SYS-4-CHUNKMALLOCFAIL: Could not allocate chunks for CEF:
> > arp throt
> > Total free: 0, Total inuse: 500, Cause : Not a dynamic chunk
> >  -Process= "<interrupt level>", ipl= 1, pid= 87 -Traceback= 0x612B36C4
> > 0x6002CA54 0x6002CAB8 0x615F1CD0 0x6005E8D8 0x60057CD0 0x60A15770 0x60A18448
> > 0x602CD374 0x60AFD9B8
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