[e2e] Admission Control and Policing in MPLS

Ping Pan pingpan at cs.columbia.edu
Thu Nov 4 15:07:03 PST 2004

First, in the (MPLS) backbone networks, most of the links are
over-provisioned, so not sure CAC and many QoS enforcement would make much
use there.

At the edge, CAC is relevant. In MPLS label, there is a 3-bit field, EXP,
that can be used to carry DiffServ class. The LSP's that carry such
information is called EXP-inferred LSP (E-LSP). The MPLS router can run the
standard DiffServ 2-color/1-color CAC, queuing, dropping etc. on all the
packets within the LSP. This function becomes more important during flow

There are a bunch of drafts from Cisco on this topic over the years.

- Ping

> -----Original Message-----
> From: end2end-interest-bounces at postel.org 
> [mailto:end2end-interest-bounces at postel.org] On Behalf Of Fahad Dogar
> Sent: Wednesday, October 20, 2004 12:12 AM
> To: end2end-interest at postel.org
> Subject: [e2e] Admission Control and Policing in MPLS
> Hi,
> I would like to know the mechanism employed in MPLS networks 
> for admission control and the process of subsequently 
> policing the flow in order to ensure that it does not violate the SLA.
> Any help or pointers to any standardized requirements would 
> be greatly appreciated.
> Thanks in advance,
> Fahad

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