[c-nsp] ASR920 Microbursts

[Mattias Gyllenvarg]

>From what I have understood it is a 12MB global buffer pool.
On 4 Aug 2015 4:47 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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