[alcatel-nsp] Why do Network Ingress ports share a buffer pool

[Garcia Del Rio, Diego (Diego)]

I would say due to the fact that sap-egress could collect traffic from multiple sources into a single destination and that there is potential for a big oversubscription and thus buffer space utilization. 

I wouldn't exect shaping on nw egress though and much less oversubscription. 

Diego Garcia del Rio
Product Management, IPD
Mountain View,CA
+1 (415) 439-9420


----- Original Message -----
From: alcatel-nsp-bounces at puck.nether.net <alcatel-nsp-bounces at puck.nether.net>
To: Thedin Guruge <thedin at gmail.com>
Cc: alcatel-nsp at puck.nether.net <alcatel-nsp at puck.nether.net>
Sent: Tue Jun 07 00:11:53 2011
Subject: Re: [alcatel-nsp] Why do Network Ingress ports share a buffer pool

Thedin,

Thanks, I understand the access-ingress part. But I was wondering why
access-egress and network-egress cannot share a buffer space, since we
have already rate-limited on access-ingress.

-Bryan

On Mon, Jun 6, 2011 at 2:11 PM, Thedin Guruge <thedin at gmail.com> wrote:
> Hi Bryan,
> For access ingress, you can't be reliant on access seekers for providing
> rate-limited traffic, whereas in network ports it is fair in assuming so
> since the traffic has already been through access ingress.
> Cheers,
> Thedin
> On Tue, Jun 7, 2011 at 4:34 AM, Bryan <deadheadblues at gmail.com> wrote:
>>
>> Hello,
>>
>> I am reading about Alcatel QoS in the book "Advanced QoS for
>> Multi-Service IP/MPLS Networks" and have a question about buffer pool
>> reservation. On page 146 it says network ingress ports can all share
>> the same pool to take advantage of the statistical multiplexing gain.
>> The reason is because all traffic has already been rate limited on
>> access ingress so chance of one flow consuming the entire buffer is
>> low.
>>
>> But, if this is true, then don't the access egress and network egress
>> have the same statistical multiplexing gains to realize? After all,
>> anything coming in on a network ingress port is leaving through an
>> egress port (network or access).
>>
>> Thanks,
>>
>> Bryan
>> _______________________________________________
>> alcatel-nsp mailing list
>> alcatel-nsp at puck.nether.net
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>
>
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