CoS based resource allocation (CBRA) in VPNs over MPLS

Abstract

A virtual private network (VPN) is provisioned over public network infrastructure to provide dedicated connectivity to a closed group of users. Resource guaranteed VPNs are static and require complex service level agreements (SLAs), whereas tunnelled VPNs, such as those in use over the Internet, are more lightweight but do not assure quality of service (QoS). In this paper, we propose a programmable tempest framework for class of service (CoS) based resource allocation (CBRA) in multi protocol label switching (MPLS) tunnelled VPNs. Switchlet based resource partitioning concept is used to create, build and provision multiple VPNs on demand. The proposed approach provides overlay control architecture for both intra-and inter-VPN resource allocations. The intra-VPN resource allocation is based on class of service (CoS) arbitration using derived labels and derived switchlets and inter-VPN resource allocation is through bandwidth brokering (BB). We have evaluated the intra-VPN resource allocation and management by enhancing the MPLS label space with CoS based derived labels and initial results are encouraging.