[c-nsp] strange RTT increase in ASR1006

Tassos Chatzithomaoglou achatz at forthnetgroup.gr
Sun Feb 3 14:20:58 EST 2013

That was my initial though too.
But even with two SIPs, each one with one 10G SPA, the problem remains. That's why i'm
blaming the ESP.

There aren't any drops shown with the "show...plim"commands.


Nick Hilliard wrote on 3/2/2013 19:06:
> On 03/02/2013 09:34, Tassos Chatzithomaoglou wrote:
>> That was my very first source of information. Although it's missing some explanations,
>> it's nice to see such info on CCO.
>> The problem is that increased rtt (probably due to excessive buffering/queuing) isn't
>> discussed into this, only packet drops.
> just noticed you're using a sip10 in the second scenario.  Are both of the
> 10ge ports on the same sip10?  If so, you could easily be microbursting
> beyond the 10G capacity on the sip.
> Do you had a spare sip10?  If you could connect up the second 10GE port to
> a second sip10 and check the configuration for packet loss?
> Also what do the following commands show on the esp20/sip10 box:
> Router# show platform hardware port 1/0/0 plim statistics
> Router# show platform hardware port 1/1/0 plim statistics
> The RP CPU shouldn't be affected by the traffic load unless the esp is
> punting packets to it.
> Nick

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