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

Anthony Law antnada at hotmail.com
Tue Jan 23 17:30:59 EST 2007

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 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 no ip mroute-cache!interface FastEthernet2/0 description !!Internet Feed!! ip address Y.Y.Y.Y 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 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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