04-10-2013 12:23 PM - edited 03-07-2019 12:44 PM
Hello
The process "HL3U bkgrd proce" is causing high CPU usage issues in a switch 3750X-24T-L. The IOS is
15.0.2-SE2.
show platform ip unicast failed route and adjacencies displays a lot of entries, I've seen up to 1200.
After restart HL3U bkgrd proce takes around 10 - 20 % CPU, some hours later 99%.
A coupe of times we got logs like this:
%SYS-3-CPUHOG: Task is running for (2136)msecs, more than (2000)msecs (172/73),process = HL3U bkgrd process.
-Traceback= 0x1BE9C3Cz 0x27E103Cz 0x27E0F64z 0x50DCF8z 0x50DE98z 0x503BD0z 0x4F7718z 0x1FF0A18z 0x1F46DECz 0x1F4816Cz 0x1F48698z 0x1F499C8z 0x1FF15D0z 0x2000430z 0x1FF55B4z 0x1FF5FA4z
which desapear after restart.
also
%SYS-3-MGDTIMER: Uninitialized timer, init with uninitialized master, timer = 47327A8. -Process= "Init", ipl= 0, pid= 4
-Traceback= 4FCA14z 1C3A44Cz 85C464z 1C43F94z 1C44154z 1C44270z 50C180z 50C378z 26BF904z 26BA058z
at startup.
Could this be caused by too high L3 traffic? We have only 3 VLAN with about 300Mbps of traffic. We have a very simple configuration, without routing protocols or policies. Just a single static route and inter-VLAN routing (3 vlans directly connected)..
I would appreciate any help.
Thanks.
04-10-2013 02:11 PM
Julio,
You may have an excessive ARP issue
Regards,
Alex.
Please rate useful posts.
04-10-2013 09:21 PM
Hi,
Hl3u bkgrd process - manages quite a few background tasks like
- Hardware Arp throttling house keeping tasks
- Retry adjs/Fib in case of an out of hardware resource condition
- proxy arp house keeping functions
- ICMP redirect processing
- TTL ICMP error generation in some conditions
- handling correct route forwarding in an output acl full condition
2) Check for ARP statictics under sh ip traffic.I dont have any access to the config of your device hence assuming.
could you check if "no ip arp incomplete enable" command dose the trick for you?
3) Also consider the bug mentioned by Alex thats a clean hit.
HTH
Regards
Inayath
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