[c-nsp] 3750 with high CPU

[Rubens Kuhl Jr.]

On 12/18/06, Ed Butler <ed.butler at rapidswitch.com> wrote:
> We had this before - it was a real pain to track down. On our 3750s it
> turned out that we were running out of TCAM space for IPv4 routes. What
> do these two commands show?
>



#sh ip arp summ
41 IP ARP entries, with 0 of them incomplete


#sh sdm prefer
 The current template is "desktop default" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  6K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    8K
    number of directly-connected IPv4 hosts:        6K
    number of indirect IPv4 routes:                 2K
  number of IPv4 policy based routing aces:         0
  number of IPv4/MAC qos aces:                      512
  number of IPv4/MAC security aces:                 1K



#sh ip route summary
IP routing table name is Default-IP-Routing-Table(0)
IP routing table maximum-paths is 32
        Networks    Subnets     Overhead    Memory (bytes)
Total           96          1244        84072       254680

#sh ip route vrf <one client> summary
Total           35          3           2368        6796

#sh ip route vrf <another client> summary
Total           9           8           1024        3604



#sh vlan summary
Number of existing VLANs           : 75
Number of existing VTP VLANs      : 74
Number of existing extended VLANs : 1


Thanks,
Rubens

>
> Regards,
>
> Ed Butler
> RapidSwitch Ltd
> DDI: 020 7106 0731
>
> RapidSwitch Ltd, 5th Floor, Sovereign House, 227 Marsh Wall, London, E14
> 9SD
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> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rubens Kuhl Jr.
> Sent: 18 December 2006 14:34
> To: Cisco-NSP Mailing List
> Subject: [c-nsp] 3750 with high CPU
>
> I'm trying to diagnose what is causing a 3750 ME to have high cpu usage.
> "show proc cpu sorted" shows no process with more than 3% CPU usage;
> sometimes the most consuming process is "IP SNMP", sometimes it's "MFI
> LD Timer", sometimes it is "Spanning Tree", but adding up the % doesn't
> come even close to the total amount:
> "CPU utilization for five seconds: 64%/56%; one minute: 64%; five
> minutes: 63%"
>
> So, it seems something in the interrupt path is causing the CPU usage.
>
> #sh ip cef switching statistics
>
>        Reason                          Drop       Punt  Punt2Host
> RP RIB Packet destined for us             0   10221271          0
> RP RIB Total                              0   10221271          0
>
> RP LES No route                       13826          0        555
> RP LES Packet destined for us             0    1041551          0
> RP LES No adjacency                   18970          0     171714
> RP LES Unresolved route                  45          0          0
> RP LES TTL expired                        0          0       8440
> RP LES IP options set                     0          0      11111
> RP LES Routed to Null0                12735          0      15991
> RP LES IP redirects                       0          0         56
> RP LES Unclassified reason             3648          0          0
> RP LES Total                          49224    1041551     207867
>
> All    Total                          49224   11262822     207867
>
>
> RP RIB punts are ocurring at a rate of 5 pps, and RP LES punts have a
> near 1 pps rate. Are these rates enough to take the 3750 CPU to 60%
> usage ? Any ideas of what to look for ?
>
> IOS version is 12.2(25)SED, running MPLS, IBGP for VPNv4 and OSPF.
>
>
>
> Rubens
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