[cisco-bba] need help on troubleshooting high cpu on 7206 NPE300 LNS

[Anthony Law]

Dear all, We have a 7206 w/NPE300 running as a LNS terminating pppoe sessions from our telco. We are concurrently running around 360 pppoe sessions. Recently. I noticed that our 7206 is having extremely high cpu, at times going to 100%, please see below CPU utilization for five seconds: 99%/42%; one minute: 99%; five minutes: 99% PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process    1           0        75          0  0.00%  0.00%  0.00%   0 Chunk Manager         5   472509060 101324023       4663  7.65%  8.80%  8.84%   0 Pool Manager       37  10810547881019294234       1060 22.79% 25.16% 25.51%   0 IP Input          101   705044020 800103660        881 18.89% 21.35% 19.34%   0 L2TP data daemon  102    53153196  10197928       5212  2.19%  0.46%  0.45%   0 L2TP mgmt daemon  It seemed that Pool Manager + IP Input + L2TP data daemon together is causing this issue. I was searching for documents regarding this on google and came to this mailing list. I am wondering if you guys can help me out by identifying the mis-configuration that I have on my end as it is my understanding that a 7206 should at least take close 1000 pppoe sessions.  Thank You in advance for your input.  hostname LNS!boot system slot1:c7200-is-mz.122-32.binboot system slot1:c7200-is-mz.120-3.T3aaa new-modelaaa authentication login default localaaa authentication login no_rad lineaaa authentication ppp default group radius localaaa authentication ppp vpdn group radiusaaa authorization network default group radiusaaa authorization configuration default group radiusaaa accounting delay-startaaa accounting exec default start-stop group radiusaaa accounting network default start-stop group radiusenable secret 5 XXXXXXXXXXXXXXXXXXXXXXXXXXX!clock timezone EST -5clock summer-time EDT recurringip subnet-zerono ip source-routeip cef!!ip name-server XXXXXXip name-server XXXXXXip name-server XXXXXX!vpdn enable! vpdn-group XXXXXXXXaccept-dialin  protocol l2tp  virtual-template 1 terminate-from hostname XXXXXX local name XXXXXXX lcp renegotiation always!interface FastEthernet0/0 ip address X.X.X.X 255.255.255.192 no ip mroute-cache duplex full!interface FastEthernet1/0 no ip address no ip mroute-cache duplex full!interface FastEthernet1/0.401 description !!XXXXXXXXXXXXXXXXXXXXXXXX!! encapsulation dot1Q 401 ip address 10.70.X.X 255.255.255.252 no ip mroute-cache!interface FastEthernet2/0 description !!Internet Feed!! ip address Y.Y.Y.Y 255.255.255.252 no ip mroute-cache duplex full!interface Virtual-Template1 mtu 1492 ip unnumbered FastEthernet2/0    peer default ip address pool internet1 internet2 ppp authentication pap vpdn!ip local pool internet1 A.A.A.A B.B.B.Bip local pool internet2 C.C.C.C D.D.D.Dip classlessip route 0.0.0.0 0.0.0.0 Y.Y.Y.Yno ip http server  !ip radius source-interface FastEthernet0/0radius-server host X.X.X.X auth-port 1645 acct-port 1646radius-server host X.X.X.X auth-port 1645 acct-port 1646radius-server key 7 ZZZZZZZZZZZZZZZ Anthony
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