Intelligent Inter-domain Connection Provisioning for Multi-domain Multi-vendor Optical Networks

Wangyang Liu; Nan Hua; Xiaoping Zheng; Bingkun Zhou

doi:10.1364/JOCN.7.000176

Journal of Optical Communications and Networking
Vol. 7,
Issue 3,
pp. 176-192
(2015)
•https://doi.org/10.1364/JOCN.7.000176

Intelligent Inter-domain Connection Provisioning for Multi-domain Multi-vendor Optical Networks

Wangyang Liu, Nan Hua, Xiaoping Zheng, and Bingkun Zhou

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Wangyang Liu, Nan Hua, Xiaoping Zheng, and Bingkun Zhou, "Intelligent Inter-domain Connection Provisioning for Multi-domain Multi-vendor Optical Networks," J. Opt. Commun. Netw. 7, 176-192 (2015)

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Abstract

We propose a semicentralized semidistributed network architecture based on active stateful path computation elements (PCEs) to intelligently provide end-to-end inter-domain connections in multi-domain optical transport networks supplied by different equipment vendors. A novel control entity, called an inter-domain communication control and management element (ICCME), is introduced into the architecture to achieve flexible distributed inter-domain control and centralized intra-domain management by integrating with “proactive” and “reactive” stateful capabilities. Inter-domain routing and signaling are completed with the collaboration of multiple ICCMEs in a peer-to-peer manner, which decentralizes highly intensive computation and signaling to multiple ICCMEs. In addition, we put forward a unified inter-domain communication protocol to eliminate the differences in private signaling message formats of various vendors’ domains. We report a successful field trial of providing inter-domain connections across a commercial three-domain three-vendor optical transport network. Also, experimental results indicate that ICCME-based architecture performs better than previous schemes in terms of scalability, i.e., low average routing load of control entities and low average delay in establishing inter-domain connections, but results in higher message overhead and blocking probability.

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Performance		Centralized	Distributed	Stackable/Hierarchical	Semicentralized Semidistributed
Representative example		NMS	GMPLS ENNI-enabled control planes [12 –15]	1. Stackable SDN [28] 2. Hierarchical PCE [24]	1. Distributed SDN [31] 2. ICCME (this paper)
Routing	Approach	Centralized routing	ENNI OSPF-based hierarchical routing between RCs [12,13]	Hierarchical routing between parent controller and child controllers [24,32]	Peer-to-peer routing (e.g., BRPC [33] with dynamic domain sequence computation)
	Optimization	Optimal	Suboptimal	Suboptimal	Suboptimal
	Load distribution	Overloaded to a central controller	Off-loaded to multiple control plane nodes	Parent controller: slightly over-loaded Child controller: off-loaded	Off-loaded to multiple controllers
LSP provisioning		Parallel/serial manner	Serial manner using RSVP-TE [17]	RSVP-TE [25,26] or OpenFlow [28]	Peer-to-peer manner within ICCME plane
Inter-domain signaling between different control domains		None	ENNI signaling [14,15]	ENNI signaling [14,15] or PCEP extensions [28]	PCEP extensions between ICCMEs
TED	Scope	Global physical topology	Higher RC: abstract topology info. Lower RC: local physical topology	Parent controller: abstract domain topology Child controller: local physical topology	All controllers: abstract domain topology and local physical topology
	Topology abstraction	None	Node aggregation [16]/link aggregation [34]	Node aggregation [24]/link aggregation [35]	Node/link (aggregation)
	Intra-domain info. confidentiality	Not guaranteed	Guaranteed	Guaranteed	Guaranteed
	Synchronization content	Global TED	Higher RC: abstract topology info. Lower RC: intra-domain TED	Parent controller: inter-domain TE links Child controller: intra-domain TED	All controllers: 1. Inter-domain TE links 2. Intra-domain TED (changed domains only)
Message overhead		Low	High	High	High
End-to-end inter-domain connection setup delay		Low	High	High (if ENNI is used)	Medium
Blocking probability under dynamic traffic scenario		Low	High	High (if ENNI is used)	Medium
Support of multi-domain multi-vendor optical networks		Not supported	Supported but needs improvement	Supported but needs improvement	Supported

Performance		Centralized	Distributed	Stackable/Hierarchical	Semicentralized Semidistributed
Representative example		NMS	GMPLS ENNI-enabled control planes [12 –15]	1. Stackable SDN [28] 2. Hierarchical PCE [24]	1. Distributed SDN [31] 2. ICCME (this paper)
Routing	Approach	Centralized routing	ENNI OSPF-based hierarchical routing between RCs [12,13]	Hierarchical routing between parent controller and child controllers [24,32]	Peer-to-peer routing (e.g., BRPC [33] with dynamic domain sequence computation)
	Optimization	Optimal	Suboptimal	Suboptimal	Suboptimal
	Load distribution	Overloaded to a central controller	Off-loaded to multiple control plane nodes	Parent controller: slightly over-loaded Child controller: off-loaded	Off-loaded to multiple controllers
LSP provisioning		Parallel/serial manner	Serial manner using RSVP-TE [17]	RSVP-TE [25,26] or OpenFlow [28]	Peer-to-peer manner within ICCME plane
Inter-domain signaling between different control domains		None	ENNI signaling [14,15]	ENNI signaling [14,15] or PCEP extensions [28]	PCEP extensions between ICCMEs
TED	Scope	Global physical topology	Higher RC: abstract topology info. Lower RC: local physical topology	Parent controller: abstract domain topology Child controller: local physical topology	All controllers: abstract domain topology and local physical topology
	Topology abstraction	None	Node aggregation [16]/link aggregation [34]	Node aggregation [24]/link aggregation [35]	Node/link (aggregation)
	Intra-domain info. confidentiality	Not guaranteed	Guaranteed	Guaranteed	Guaranteed
	Synchronization content	Global TED	Higher RC: abstract topology info. Lower RC: intra-domain TED	Parent controller: inter-domain TE links Child controller: intra-domain TED	All controllers: 1. Inter-domain TE links 2. Intra-domain TED (changed domains only)
Message overhead		Low	High	High	High
End-to-end inter-domain connection setup delay		Low	High	High (if ENNI is used)	Medium
Blocking probability under dynamic traffic scenario		Low	High	High (if ENNI is used)	Medium
Support of multi-domain multi-vendor optical networks		Not supported	Supported but needs improvement	Supported but needs improvement	Supported

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Journal of Optical Communications and Networking