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ASR1K "PPP IP Route" CPU hog

Today I've updated the last of our six ASR1002s to IOS XE 3.10.1S.  All other are fine, but this one not so much - since the reload it's been stuck at ~80% CPU load, mainly due to "PPP IP Route" process activity.  Compared to other devices with similar load (in terms of number of PPPoE sessions) on this one the "PPP IP Route" process is invoked much more often:

asr1#sh proc cpu | i five|Invok|PPP_IP_R

CPU utilization for five seconds: 88%/6%; one minute: 77%; five minutes: 78%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

188     3311079      447339       7401 30.13% 29.22% 30.05%   0 PPP IP Route

asr1#sh proc mem | i Alloc|PPP_IP_R

PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process

188   0  450586736  244132644    1779752   20038777   20038777 PPP IP Route

(all these in about three hours of uptime, with ~3400 PPPoE sessions currently active;  the "Holding" memory counter is quite stable, all others are permanently increasing)

Everything else (evolution of interface traffic rates or number of PPPoE sessions, RADIUS activity) looks normal for the period of time since the reload.

I'm a bit reluctant to reloading it again at this time of day - is there anything I can use to further debug the issue?

Thank you.


ASR1K "PPP IP Route" CPU hog

Well, after some eight hours of 80% load it lowered slightly to 60-70% for some other eight or nine hours, and after that suddenly dropped to the usual 20-30%.

I'm already looking forward to the next reload, to see what happens...  pretty unpredictable this update-to-3.10.1 campaign so far has been .

ASR1K "PPP IP Route" CPU hog

Well, it happened again - this ASR has a total of two interfaces in use, both 10G, both connected to a 7606-S.  Early this morning we reloaded the 7606 in order to upgrade its IOS, and since then the ASR has been stuck at ~80% CPU load again due to "PPP IP Route" process being heavily active.  We'll probably reload it tomorrow morning, to see what happens...

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