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

Arie Vayner ariev at vayner.net
Thu Jan 25 02:38:14 EST 2007 

On 1/25/07, Arie Vayner <ariev at vayner.net> wrote:
>
> Anthony,
>
> The high CPU on IP Input is normal, as this is where the L2TP work is
> being done.
> Also note that you have a high rate of CPU being used in Interrupts
> (91%/44% means that 44% is used for Interrupts). Interrupts on Cisco routers
> are usually linked directly to a high rate of traffic (on centralized CPU
> devices).
> I would assume you box is very close to its limit of how much traffic it
> can handle. Could you please send some of the "show interface" outputs (for
> the FastEthernet/GigE/ATM ports you might have). This would allow us to get
> a better estimation.
>
> You need to take into account that this is a centralized CPU platform, and
> all traffic is handled by the CPU. This means that the scale factor is not
> only a question of how many sessions you have concurrently, but also how
> much traffic (mostly in PPS and not BPS) they transmit.
>
> Thanks
> Arie
>
> On 1/25/07, Anthony Law <antnada at hotmail.com> wrote:
> >
> >
> > Dear all
> >
> > Thank you for all of your input. I configured vpdn ip udp ignore
> > checksum
> > & I have corrected a mis-config on our radius server (passing
> > compression attribute to cisco) now that the L2TP data daemon is running
> > normal, but I am still facing high cpu on Pool Manager & IP Input
> > anymore suggestions?
> >
> >
> > CPU utilization for five seconds: 91%/44%; one minute: 91%; five
> > minutes: 86%
> >  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
> >    1           4       175         22  0.00%  0.00%  0.00%   0 Chunk
> > Manager
> >    2      487964   5014024         97  0.00%  0.00%  0.00%   0 Load
> > Meter
> >    3     1606476    870141       1846  0.00%  0.00%  0.00%   0 CEF
> > Scanner
> >    4    22428792   3318958       6757  0.00%  0.06%   0.05%   0 Check
> > heaps
> >    5   481842360 102963163       4679  9.05%  9.70%  7.90%   0 Pool
> > Manager
> >   37  11275060121049358292       1074 36.02% 35.07% 32.40%   0 IP Input
> >
> > Thank You
> >
> > Anthony
> >
> >
> >
> > ------------------------------
> >
> > > Date: Wed, 24 Jan 2007 02:37:10 +0200
> > > From: nitzan.tzelniker at gmail.com
> > > To: antnada at hotmail.com
> > > Subject: Re: [cisco-bba] need help on troubleshooting high cpu on 7206
> > NPE300 LNS
> > > CC: cisco-bba at puck.nether.net
> > >
> > > You can try
> > >
> > > vpdn ip udp ignore checksum
> > >
> > > Nitzan
> > >
> > > On 1/24/07, Anthony Law < antnada at hotmail.com> wrote:
> > > > 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.bin
> > > > boot system slot1:c7200-is-mz.120-3.T3
> > > > aaa new-model
> > > > aaa authentication login default local
> > > > aaa authentication login no_rad line
> > > > aaa authentication ppp default group radius local
> > > > aaa authentication ppp vpdn group radius
> > > > aaa authorization network default group radius
> > > > aaa authorization configuration default group radius
> > > > aaa accounting delay-start
> > > > aaa accounting exec default start-stop group radius
> > > > aaa accounting network default start-stop group radius
> > > > enable secret 5 XXXXXXXXXXXXXXXXXXXXXXXXXXX
> > > > !
> > > > clock timezone EST -5
> > > > clock summer-time EDT recurring
> > > > ip subnet-zero
> > > > no ip source-route
> > > > ip cef
> > > > !
> > > > !
> > > > ip name-server XXXXXX
> > > > ip name-server XXXXXX
> > > > ip name-server XXXXXX
> > > > !
> > > > vpdn enable
> > > > !
> > > > vpdn-group XXXXXXXX
> > > > accept-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.B
> > > > ip local pool internet2 C.C.C.C D.D.D.D
> > > > ip classless
> > > > ip route 0.0.0.0 0.0.0.0 Y.Y.Y.Y
> > > > no ip http server
> > > > !
> > > > ip radius source-interface FastEthernet0/0
> > > > radius-server host X.X.X.X auth-port 1645 acct-port 1646
> > > > radius-server host X.X.X.X auth-port 1645 acct-port 1646
> > > > radius-server key 7 ZZZZZZZZZZZZZZZ
> > > >
> > > > Anthony
> > > >
> > > > ________________________________
> > > > Be one of the first to try Windows Live Mail.
> > > > _______________________________________________
> > > > cisco-bba mailing list
> > > > cisco-bba at puck.nether.net
> > > > https://puck.nether.net/mailman/listinfo/cisco-bba
> > > >
> > > >
> > > >
> >
> >
> > ------------------------------
> > Be one of the first to try Windows Live Mail.<http://ideas.live.com/programpage.aspx?versionId=5d21c51a-b161-4314-9b0e-4911fb2b2e6d>
> >
> > _______________________________________________
> > cisco-bba mailing list
> > cisco-bba at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-bba
> >
> >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-bba/attachments/20070125/c343aa3f/attachment-0001.html

More information about the cisco-bba mailing list