[e2e] Admission Control and Policing in MPLS
sudeepg at cse.iitb.ac.in
Fri Nov 5 04:59:46 PST 2004
Hi Ping Pan,
Thanks for the information. But, you say that CAC would make sense at
the edge. Would you please tell what are the mechanisms used
in real ISP networks to find out the explicit paths that meet certain QoS
flow requirement. Or are the paths are statically (manually) set without
any dynamic traffic engineering ?
I am presently working on algorithms on admission control on MPLS (and
MPLS over DiffServ network) and have worked out few algorithms in theory.
But, I donot yet know how and what actually ISPs are doing in reality for
admission control ? Does it make sense commercially to come up with good
TE techniques or algorithms that would help us find explicit paths in MPLS
network at the edge that would meet certain QoS requirements. Or may be,
given a LSP path, it makes more sense going for a DiffServ admission
control rather than finding explicit path.
Thanks for anticipated help.
On Thu, 4 Nov 2004, Ping Pan wrote:
> 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
>> 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,
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