[c-nsp] ASR920 Microbursts

[George Giannousopoulos]

Hi,

Are you sure the drops are due to microbursts?

We have an ongoing issue with drops on ASR920 and TAC informed us that the
same counter is used for the mismatched encapsulation packets too.

That means, no matter how big your buffer is, you may still see some drops
on your interface, depending on your configuration..

--
George


On Tue, Aug 4, 2015 at 5:46 PM, Jordi Magrané Roig <jordimagrane at hotmail.com
> wrote:

> Dear Colleagues,
>
>
>
> Recently I have installed one ASR920 and I have configured on 1G interface
> one service instance with an outbound policy-map shaping to 30 Mbps. The
> problem is that I noticed that the ASR920 has the same microburst issue
> than
> the ME3600. I have tried to adjust the queue-limit in order to avoid drops
> but then the latency increments. I have configured:
>
>
>
> policy-map POLICY_CUSTOMER_EGRESS_30Mbps
>
> class class-default
>
>   shape average 30000000
>
>
>
> I have tried also with different classes of service but the issue still
> persist.
>
>
>
> I would like to know the recommendation about the queue-limit size, the
> relation with the values of burst committed and then what should be the
> recommended configuration of shaping, recommendations about fine tunning
> the
> shaping. I have noticed that there Cisco platforms that shape better, for
> example the ASR9001 or 7600 with ES+ shape better than ASR1000 with
> SPA-5X1GE-V2 or ME3600.
>
>
>
> Another problem is that I didn’t find enough information about QoS on
> ASR920
> platform. Somebody knows the default queue size of 1G port? How the packet
> buffer works? Is it like ME3600 (shared queue buffer per ASIC)?
>
>
>
> Thanks!
>
>
>
>
>
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