CompSysTech '07 Proceedings of the 2007 international conference on Computer systems and technologies
Fast reroute with pre-established bypass tunnel in MPLS
Computer Communications
A novel path protection scheme for MPLS networks using multi-path routing
Computer Networks: The International Journal of Computer and Telecommunications Networking
Fault tolerance and security issues in MPLS networks
ACS'10 Proceedings of the 10th WSEAS international conference on Applied computer science
Computers and Operations Research
Local restoration with multiple spanning trees in metro ethernet networks
IEEE/ACM Transactions on Networking (TON)
ISPA'06 Proceedings of the 2006 international conference on Frontiers of High Performance Computing and Networking
MPLS alternate path restoration with guaranteed bandwidth
ICCSA'06 Proceedings of the 2006 international conference on Computational Science and Its Applications - Volume Part II
Hi-index | 0.07 |
The emerging multiprotocol label switching (MPLS) networks enable network service providers to route bandwidth guaranteed paths between customer sites. This basic label switched path (LSP) routing is often enhanced using restoration routing which sets up alternate LSPs to guarantee uninterrupted connectivity in case network links or nodes along primary path fail. We address the problem of distributed routing of restoration paths, which can be defined as follows: given a request for a bandwidth guaranteed LSP between two nodes, find a primary LSP, and a set of backup LSPs that protect the links along the primary LSP. A routing algorithm that computes these paths must optimize the restoration latency and the amount of bandwidth used. We introduce the concept of "backtracking" to bound the restoration latency. We consider three different cases characterized by a parameter called backtracking distance D: 1) no backtracking (D=0); 2) limited backtracking (D=k); and 3) unlimited backtracking (D=∞). We use a link cost model that captures bandwidth sharing among links using various types of aggregate link-state information. We first show that joint optimization of primary and backup paths is NP-hard in all cases. We then consider algorithms that compute primary and backup paths in two separate steps. Using link cost metrics that capture bandwidth sharing, we devise heuristics for each case. Our simulation study shows that these algorithms offer a way to tradeoff bandwidth to meet a range of restoration latency requirements.