[c-nsp] Best practice - Core vs Access Router

[David Freedman]

So, are you checking your interfaces for incrementing drop/error counters?

Are you seeing any of this when there is the problem occuring?
(clear counters , sh int summ etc..)

Dave.


What about
Andy B. wrote:
> I am currently facing this strange behaviour once again. Nothing
> suspicious in terms of CPU:
> 
> #sh proc cpu sort | ex 0.00
> CPU utilization for five seconds: 7%/3%; one minute: 24%; five minutes: 23%
>  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
>  123   823552748 891845755        923  1.35%  1.32%  1.24%   0 IP Input
>  142    42990360 548209142         78  0.63%  0.15%  0.06%   0 IP SNMP
>  176    81597832 313530395        260  0.63%  0.20%  0.12%   0 SNMP ENGINE
>  286    95557652  68837887       1388  0.31%  4.77%  4.27%   0 BGP Router
>   46        8724      6895       1265  0.31%  0.33%  0.24%   2 SSH Process
>  169    98755140   5844411      16897  0.31%  0.31%  0.31%   0 Adj Manager
>    9    92740444 222352412        417  0.23%  0.40%  0.41%   0 ARP Input
>  320    20411156 140247526        145  0.15%  1.64%  1.57%   0 BGP I/O
>  180    64470940  51288798       1257  0.15%  0.58%  0.44%   0 CEF process
>  167    27190044 390437731         69  0.15%  0.12%  0.10%   0 IPv6 Input
> 
> #remote command switch sh proc cpu sort | ex 0.00
> CPU utilization for five seconds: 10%/0%; one minute: 14%; five minutes: 20%
>  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
>  102   577414400  14603714      39539  5.19%  2.76%  2.58%   0 Vlan Statistics
>   42  11702922242664309865          0  3.91%  3.83%  3.87%   0 slcp process
>  257    79620728  46604862       1708  0.23%  1.31%  0.92%   0 CEF process
>  152    24224440  35123075        689  0.15%  0.08%  0.07%   0 CEF LC Stats
>   33    29231032 224654615        130  0.15%  0.08%  0.07%   0 SCP Download Lis
>  131    39865856   1338254      29789  0.07%  0.08%  0.11%   0 TCAM Manager pro
>  127    37865260 135955648        278  0.07%  0.07%  0.07%   0 Spanning Tree
>  187    12366092   3103775       3984  0.07%  0.04%  0.05%   0 v6fib stat colle
>  239    11888108   8600338       1382  0.07%  0.04%  0.03%   0 LTL MGR cc
> 
> Packet loss to the router (nothing behind it) is around 25%.
> And still loosing random BGP and OSPF sessions. SNMP graphs are not
> being generated either.
> 
> Currently feeling quite desperate, because I have no clue where to look next...
> 
> Andy
> 
> On Tue, Feb 9, 2010 at 6:56 PM, Phil Mayers <p.mayers at imperial.ac.uk> wrote:
>> On 09/02/10 17:39, Church, Charles wrote:
>>> I was going by the 'show proc cpu hist' he gave for both the SP and RP.
>>> Both looked pretty bad across the board.
>> His graphs don't look that dis-similar to mine, and we have no such
>> problems. The peak/avg CPU don't look so unreasonable to me given the load
>> and setup he's described.
>>
>> To summarise in this thread, it has been suggested:
>>
>>  1. Netflow is the problem - to which the OP said he's already tried
>> disabling it
>>
>>  2. CPU punts, specifically gleans, are the problem - in which case CoPP or
>> MLS rate limiters can be tried, but the OP really IMHO needs to confirm this
>> with a span of the CPU
>>
>>  3. The 6500 is just no good buy a juniper or asr1k (!) which I strongly
>> dispute. It may be awkward and have odd limits, but it OUGHT TO HANDLE the
>> load we've been told about; therefore something is wrong
>>
>> ...and lots more besides. I'm exhausted from following the thread, but my
>> advice to the OP is to determine what is hitting the CPU *during an outage*,
>> then proceed from there.
>>
>> I'm going to stop reading now.
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