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UC540 and memory issues

I had a customer with a UC540 call approx. three or four days ago, and he couldn't get from his home PC into his work PC via RDP.  The work PC is behind a UC540.  He restarted the UC540 (power cycle) and it seemed to start behaving.

Today he was having voice quality issues and I noticed a decent amount of jitter on the line (I use PingPlotterPro to monitor his Internet connection).  So I had him power-cycle his AT&T U-Verse modem.  After that, he was unable to get any Internet connections so he had to power-cycle his UC540.

Things seemed to improve a bit for a while, but then call quality suffered and I started to dig into the UC540 a bit, looking at its built-in diagnostics page.  The output on the diagnostics page had this:

 

UC_540
Home Exec Configure
--------------------------------------------------------------------------------

Syslog logging: enabled (0 messages dropped, 10 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)

No Active Message Discriminator.

 

No Inactive Message Discriminator.


    Console logging: level debugging, 287 messages logged, xml disabled,
                     filtering disabled
    Monitor logging: level debugging, 0 messages logged, xml disabled,
                     filtering disabled
    Buffer logging:  level debugging, 294 messages logged, xml disabled,
                    filtering disabled
    Exception Logging: size (4096 bytes)
    Count and timestamp logging messages: disabled
    Persistent logging: disabled

No active filter modules.

    Trap logging: level informational, 340 message lines logged
        Logging Source-Interface:       VRF Name:

Log Buffer (4096 bytes):
DNSOVERLOAD: Low available memory: dropping <id# 37096> from <cli 192.168.10.3>.
000270: Aug 15 22:28:32.467: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 20075> from <cli 192.168.10.3>.
000271: Aug 15 22:28:32.603: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 44542> from <cli 192.168.10.3>.
000272: Aug 15 22:28:33.407: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 39508> from <cli 192.168.10.2>.
000273: Aug 15 22:28:33.467: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 20075> from <cli 192.168.10.3>.
000274: Aug 15 22:28:35.467: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 20075> from <cli 192.168.10.3>.
000275: Aug 15 22:28:36.247: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 11572> from <cli 192.168.10.3>.
000276: Aug 15 22:28:50.224: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB Pool . No memory available -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FA951Cz 803043E0z 802E9ECCz
000277: Aug 15 22:29:03.652: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 46135> from <cli 192.168.10.3>.
000278: Aug 15 22:29:04.660: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 46135> from <cli 192.168.10.3>.
000279: Aug 15 22:29:05.648: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 46135> from <cli 192.168.10.3>.
000280: Aug 15 22:29:05.848: %SYS-2-MALLOCFAIL: Memory allocation of 736768 bytes failed from 0x82FE819C, alignment 8
Pool: Processor  Free: 2282616  Cause: Memory fragmentation
Alternate Pool: None  Free: 0  Cause: No Alternate pool
 -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FAB350z 82FCF168z 82FE81A0z 82FA924Cz 82FA9478z 803043E0z 802E9ECCz
000281: Aug 15 22:29:05.848: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB
[snip]

 

 

I did a couple of restarts of the UC540 via a telnet "reload" and kept getting that same result.  Then I rebooted the PC I was using (which was 192.168.10.3) and made sure CCA wasn't started, then did another reload and now I'm getting this:

 

UC_540
Home Exec Configure
--------------------------------------------------------------------------------

Syslog logging: enabled (0 messages dropped, 10 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)

No Active Message Discriminator.

 

No Inactive Message Discriminator.


    Console logging: level debugging, 256 messages logged, xml disabled,
                     filtering disabled
    Monitor logging: level debugging, 0 messages logged, xml disabled,
                     filtering disabled
    Buffer logging:  level debugging, 263 messages logged, xml disabled,
                    filtering disabled
    Exception Logging: size (4096 bytes)
    Count and timestamp logging messages: disabled
    Persistent logging: disabled

No active filter modules.

    Trap logging: level informational, 304 message lines logged
        Logging Source-Interface:       VRF Name:

Log Buffer (4096 bytes):
Processor  Free: 5774524  Cause: Memory fragmentation
Alternate Pool: None  Free: 0  Cause: No Alternate pool
 -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FAB350z 82FCF168z 82FE81A0z 82FA924Cz 82FA9478z 803043E0z 802E9ECCz
000245: Aug 15 22:48:51.765: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB Pool . No memory available -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FA951Cz 803043E0z 802E9ECCz
000246: Aug 15 22:48:56.593: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 19106> from <cli 192.168.10.2>.
000247: Aug 15 22:49:09.914: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB Pool . No memory available -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FA951Cz 803043E0z 802E9ECCz
000248: Aug 15 22:49:27.947: %SYS-2-MALLOCFAIL: Memory allocation of 736768 bytes failed from 0x82FE819C, alignment 8
Pool: Processor  Free: 5231612  Cause: Memory fragmentation
Alternate Pool: None  Free: 0  Cause: No Alternate pool
 -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FAB350z 82FCF168z 82FE81A0z 82FA924Cz 82FA9478z 803043E0z 802E9ECCz
000249: Aug 15 22:49:27.947: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB Pool . No memory available -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FA951Cz 803043E0z 802E9ECCz
000250: Aug 15 22:49:31.595: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 8676> from <cli 192.168.10.2>.
000251: Aug 15 22:49:36.595: %DNSSERVER-3-UDPDNSOVERLOAD: Low available memory: dropping <id# 8676> from <cli 192.168.10.2>.
000252: Aug 15 22:49:45.859: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for CCSIP CCB Pool . No memory available -Process= "Chunk Manager", ipl= 6, pid= 1
-Traceback= 8177F9F8z 82FA951Cz 803043E0z 802E9ECCz
[snip]

 

 

I'm truncating those logs a bit, I'm not sure how many lines helpers here may need telling us we're low on memory.

So I'm not sure how to proceed.  After a reload, the SIP trunk takes maybe a call or two, and then I can't call in any more.  I'm not sure about calling OUT, I'm remote to the site.

Any ideas on where to start?

 

 

1 REPLY
New Member

HiI have seen this in the

Hi

I have seen this in the past as well. I recommend the following:

1) Disable DNS Server on UC540, then point all LAN PCs to using public DNS such as Google: 8.8.8.8, 8.8.4.4 This can be done manually for static or by changing DHCP Server scope options

2) Make sure that the firewall is enabled on the UC540 WAN interface

3) Ensure you are using the latest IOS version for the UC540 platform.

 

It could be that your router is under attack or is participating in a DNS attack via your client computers.

Kind regards.

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