ASTN/ASON and GMPLS Overview and Comparison. By, Kishore Kasi Udayashankar Kaveriappa Muddiyada K. Motivations Complex process of provisioning of end-to-end transport service Heterogeneous transport networks Automation of end-to-end provisioning Ability to offer more service
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Overview and Comparison
In ASON (Continued…) 576), Fall ‘06
Joint federation Model
PBM Framework Modeling
Policy based admission control.
Policy Information Models
“Policies are used to control the state that a managed object is in at any given time; the state itself is modeled using an information model”.
Policy core Information Model (PCIM), MIB, PIB.
Policy rule – It is a binding of a set of policy actions to a set of policy conditions.Features (Continued…)
Fundamental principles of GMPLS CP
Separating protocol generic and application specific mechanisms.
TE Link as a unique application specific entity.
Two-stage OSPF architecture and database.
TE Link – resource aggregates that are encoded as links with TE attributes.
OSPF-TE with opaque LSA capabilities along with topology LSA distribution.Control Plane and PBM Architecture
 connection request using call setup messages over UNI
[1b] comparing client id and port with call admission directives, does not match.
[2a] call level parameters translate into network resource related requirements and evaluated by LPDP.
[2b] requirements verified against general connection admission policy
 May be asked to renegotiate due to network or node limitation
 connection setup is delegated to TEC which checks against path selection policy rules with LPDP
 signaling controller (SgC) requests LPDP to check against signaling control policy rules.
 ingress node signals modified call setup request.
[1a] TE link emits TCA to TEC, internal signal.
[1b] TE link emits TCA to Management Plane (MP), CP-MP interaction notification.
 TEC requests PEP to invoke event policy rule.
 PEP forwards decision request to PDP (local, global or both)
[3a],[3b] LPDP evaluates load-distribution action policy rule. If it does not succeed, create LSP create action policy is evaluated with global PDP.
 LPDP evaluates path computation/selection policy rules and delegates TEC to enforce policy decisions.
 TEC triggers SgC for setup of server layer.
 If success, TEC will check LSA update policy and Information dissemination policy to initiate LSA update.
. TEC updated TEDB with new FA-LSP and notifies MP about result of policy decision [8a]
[8b] TE Link emits state change notification to inform MP.