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

Thedin Guruge thedin at gmail.com
Mon Jun 6 17:11:58 EDT 2011

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.



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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