[cisco-bba] cpu load due to PPP IPCP (Add Route)
Tassos Chatzithomaoglou
achatz at forthnet.gr
Tue Jun 21 00:32:36 EDT 2005
This 7200 is using 12.3(12b)...is the correct ios version ;-)
Tassos Chatzithomaoglou wrote on 21/6/2005 7:29:
> Hi Dennis,
>
> That's exactly what i also said to my colleague who did "clear ppp queues".
> But according to his sayings and to our graphs the cpu problem was
> resolved just afterwards.
> I don't know if this was just a coincidence.
>
> Also after a while (or maybe at the same time but we hadn't noticed it)
> we had another problem.
> The vpdn tunnel which was terminating to this 7200 couldn't accept any
> more L2TP sessions. It was like incoming ppp was blocked (continuesly
> "LCP: O CONFREQ" with no answer from the peer). We had to tear down the
> tunnel manually in order to make it work again.
>
> This 7200 is using 12.2(12b).
>
> Dennis Peng wrote on 21/6/2005 2:36:
>
>> What version was this? I'm not sure how this would happen. It's
>> strange that "clear ppp queues" did anything since that should only
>> clear the statistics (counters). If this occurs again, can you grab
>> "debug ppp events"?
>>
>> Dennis
>>
>> Tassos Chatzithomaoglou [achatz at forthnet.gr] wrote:
>>
>>> Today we had the cpu of one of our 7200's reaching 100%. We found
>>> that this was due to the "IPCP Skipped - Add Route:" which was
>>> constantly increasing (we supply routes per user through radius).
>>> After we did a "clear ppp queue", it returned to normal.
>>>
>>> Any idea what might have happened?
>>>
>>> router#sh proc cpu sorted | e 0.00
>>> CPU utilization for five seconds: 99%/70%; one minute: 99%; five
>>> minutes: 99%
>>> PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
>>> 77 14284408 3108213 4595 20.47% 21.03% 21.11% 0 PPP
>>> IPCP <---
>>> 163 84786456 2270413 37344 1.86% 0.79% 0.64% 0
>>> VTEMPLATE Backgr
>>> 148 75342260 4779805 15762 1.19% 0.76% 0.76% 0 IGMP
>>> Input
>>> 150 92048440 14330863 6423 1.12% 1.02% 1.00% 0 PIM
>>> Process
>>> 31 42891736 4708264 9109 1.12% 0.42% 0.38% 0
>>> Per-Second Jobs
>>> 156 32672884 184875306 176 1.04% 1.03% 1.04% 0 PPP
>>> Events
>>> 79 84550988 7024517 12036 0.97% 0.69% 0.67% 0 CEF
>>> process
>>> 129 48902960 889685 54966 0.59% 0.53% 0.53% 0
>>> Compute load avg
>>> 50 56443568 247614090 227 0.29% 0.38% 0.37% 0 IP Input
>>> 5 32496292 1692766 19197 0.22% 0.17% 0.22% 0 Check
>>> heaps
>>> 167 18315212 18625936 983 0.22% 0.21% 0.24% 0 OSPF
>>> Router
>>> 63 4082388 5244432 778 0.14% 0.12% 0.11% 0 IP
>>> Background
>>> 160 1580920 997329231 1 0.14% 0.04% 0.01% 0 SAA
>>> Event Proces
>>> 76 9643460 1590124 6064 0.07% 1.58% 1.62% 0 PPP IP
>>> Route
>>>
>>>
>>> router#sh ppp queues
>>>
>>> 5 Event Queues
>>> size max kicks starts false suspends
>>> ticks(ms)
>>> 1 PPP Events 0 9 27514 27512 7
>>> 0 20
>>> 5 PPP Bind 0 2 445 445 0
>>> 0 20
>>> 3 PPP IPCP 0 0 0 0 0
>>> 0 20
>>> 2 PPP IP Route 0 3 226 226 0
>>> 0 100
>>> 4 PPP Hooks 0 1 1 1 0
>>> 0 20
>>>
>>> 30 Events
>>> # Q Name Events Queued MaxQueued Suspends
>>> usec/evt max/evt
>>> 1 1 Setup 1 0 1 0
>>> 654 654
>>> 2 1 Free PPP 661 0 3 0
>>> 111 3172
>>> 3* 1 Timer 28072 4294967290 4294967295 1
>>> 1047 9575
>>> 4 1 Cstate 18 0 3 0
>>> 1041 4249
>>> 5 1 Restart CP 0 0 0 0
>>> 0 0
>>> 6 UNREGISTERED
>>> 7 1 Hard Disc 409 0 2 0
>>> 893 2466
>>> 8 1 Soft Disc 77 0 2 2
>>> 3174 9366
>>> 9 1 Packet 2 4294967294 4294967295
>>> 0 380 475
>>> 10 1 Auth Packet 0 0 0 0
>>> 0 0
>>> 11* 3 IPCP Packet 0 0 0 0
>>> 0 0
>>> 12* 2 Add Route 0 0 0 0
>>> 0 0
>>> 13* 2 Remove Route 247 0 3 0
>>> 293 1358
>>> 14* 2 Remove Top 0 0 0 0
>>> 0 0
>>> 15* 2 Remove Flag 0 0 0 0
>>> 0 0
>>> 16* 2 Neg Addr Add 0 0 0 0
>>> 0 0
>>> 17* 2 Neg Addr Remov 0 0 0 0
>>> 0 0
>>> 18* 2 DHCP Opt Add 0 0 0 0
>>> 0 0
>>> 19* 2 DHCP Opt Del 0 0 0 0
>>> 0 0
>>> 20* 2 IPCP UP 0 0 0 0
>>> 0 0
>>> 21 1 Set LCP Open 448 0 2 0
>>> 497 1794
>>> 22 1 Virtualize 0 0 0 0
>>> 0 0
>>> 23 1 Redirect 0 0 0 0
>>> 0 0
>>> 24 1 Forwarded 1 0 1 0
>>> 317 317
>>> 25 4 Hook 1 0 1 0
>>> 17 17
>>> 26 1 AAA Response 3 0 2 0
>>> 994 1568
>>> 27 1 Static Bind 1 0 1 0
>>> 379 379
>>> 28 5 Dynamic Bind 448 0 2 0
>>> 585 1893
>>> 29 1 Bound 0 0 0 0
>>> 0 0
>>> 30 1 Virtual Profil 0 0 0 0
>>> 0 0
>>>
>>> Pre-processed Requests LCP: 0 IPCP: 0
>>> PPP Request Failures: 0
>>> PPP Hold Queue Drops: 14248
>>> IPCP Skipped - Add Route: 545 AddrAdd: 0
>>> AddrRem: 0
>>> PPP Handles: alloc[5719489] free[5717015] outstanding[2474]
>>>
>>> _______________________________________________
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>>> cisco-bba at puck.nether.net
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>>
>>
>>
>
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