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

Bryan deadheadblues at gmail.com
Mon Jun 6 18:11:53 EDT 2011


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.


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
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