Journal of Optical Communications and Networking
Vol. 10,
Issue 4,
pp. 344-352
(2018)
•https://doi.org/10.1364/JOCN.10.000344

T-Trail: Link Failure Monitoring in Software-Defined Optical Networks

Zijing Cheng, Xiaoning Zhang, Shaohui Shen, Shui Yu, Jing Ren, and Rongping Lin

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Zijing Cheng, Xiaoning Zhang, Shaohui Shen, Shui Yu, Jing Ren, and Rongping Lin, "T-Trail: Link Failure Monitoring in Software-Defined Optical Networks," J. Opt. Commun. Netw. 10, 344-352 (2018)

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Abstract

Monitoring trail (m-trail) provides a striking mechanism for fast and unambiguous link failure localization in all-optical networks. However, allocating dedicated supervisory lightpaths (m-trail) undoubtedly increases total network cost. Accordingly, how to maximally reduce monitoring cost in an optical network is an important issue. To this end, we propose a concept of traffic trail (t-trail) that uses traffic lightpaths, instead of dedicated supervisory lightpaths, to localize a single link failure in the context of a software-defined optical network (SDON). The central controller of an SDON collects routing information of all t-trails in the network. Thus, any link failure can be localized according to the ON–OFF status of the traversing t-trails. We first formulate the problem as an integer linear programming (ILP) model. Since the ILP is not feasible for solving the problem in large-size networks, an efficient heuristic algorithm t-trail allocation (TTA) is proposed to address it. We conduct extensive simulations to evaluate the performance of TTA. The results show that compared with the existing m-trail schemes, TTA can reduce total costs by 20.91% on average.

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Notation	Description
$G (V, E)$	The network topology, where $V$ denotes the set of nodes and $E$ denotes the set of links
$n$	The total number of traffic demands
$m$	The index of the traffic demand, where $1 \leq m \leq n$
$d_{m}$	The $m$ th traffic demand
$j$	The index of the t-trail
$t_{j}$	The $j$ th t-trail
$s_{u}^{j}$	A binary variable. It takes 1 if node $u$ is the source node of $t_{j}$ , 0 otherwise
$r_{v}^{j}$	A binary variable. It takes 1 if node $v$ is the sink node of $t_{j}$ , 0 otherwise
$f_{u}^{m}$	A binary variable. It takes 1 if node $u$ is the source node of $d_{m}$ , 0 otherwise
$g_{v}^{m}$	A binary variable. It takes 1 if node $v$ is the sink node of $d_{m}$ , 0 otherwise
$γ$	Predefined cost ratio of one pair of transceivers to a wavelength link
$h_{u v}$	Predefined cost of a wavelength on link ( $u$ , $v$ ). Either hop count or distance-related cost can be used (hop count is used in this paper)
$L$	The maximum hop count of t-trail when carrying traffic demand
$e_{u v}^{j}$	A binary variable. It takes 1 if $u \to v$ is an on-trail vector of $t_{j}$ , 0 otherwise
$z_{u}^{j}$	A binary variable. It takes 1 if node $u$ is traversed by $t_{j}$ , 0 otherwise
$f_{u v}^{x y}$	A binary variable. For two distinct links $(u, v)$ and $(x, y)$ , it takes 1 if $a_{u v} > a_{x y}$ , and 0 if $a_{u v} < a_{x y}$
$a_{u v}$	A general integer variable. It is the decimal alarm code assigned to link $(u, v)$

Notation	Description
$G (V, E)$	The network topology, where $V$ denotes the set of nodes and $E$ denotes the set of links
$n$	The total number of traffic demands
$m$	The index of the traffic demand, where $1 \leq m \leq n$
$d_{m}$	The $m$ th traffic demand
$j$	The index of the t-trail
$t_{j}$	The $j$ th t-trail
$s_{u}^{j}$	A binary variable. It takes 1 if node $u$ is the source node of $t_{j}$ , 0 otherwise
$r_{v}^{j}$	A binary variable. It takes 1 if node $v$ is the sink node of $t_{j}$ , 0 otherwise
$f_{u}^{m}$	A binary variable. It takes 1 if node $u$ is the source node of $d_{m}$ , 0 otherwise
$g_{v}^{m}$	A binary variable. It takes 1 if node $v$ is the sink node of $d_{m}$ , 0 otherwise
$γ$	Predefined cost ratio of one pair of transceivers to a wavelength link
$h_{u v}$	Predefined cost of a wavelength on link ( $u$ , $v$ ). Either hop count or distance-related cost can be used (hop count is used in this paper)
$L$	The maximum hop count of t-trail when carrying traffic demand
$e_{u v}^{j}$	A binary variable. It takes 1 if $u \to v$ is an on-trail vector of $t_{j}$ , 0 otherwise
$z_{u}^{j}$	A binary variable. It takes 1 if node $u$ is traversed by $t_{j}$ , 0 otherwise
$f_{u v}^{x y}$	A binary variable. For two distinct links $(u, v)$ and $(x, y)$ , it takes 1 if $a_{u v} > a_{x y}$ , and 0 if $a_{u v} < a_{x y}$
$a_{u v}$	A general integer variable. It is the decimal alarm code assigned to link $(u, v)$

T-Trail: Link Failure Monitoring in Software-Defined Optical Networks

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Equations (13)

Journal of Optical Communications and Networking