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Multilayer resilience WP2.1 19-21 september 2005

Next generation Optical Networks for Broadband European Leadership. NOBEL. Multilayer resilience WP2.1 19-21 september 2005. Benoît LEMOINE France Telecom R&D. Next generation Optical Networks for Broadband European Leadership. NOBEL. FT study on multilayer resilience.

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Multilayer resilience WP2.1 19-21 september 2005

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  1. Next generation Optical Networks for Broadband European Leadership NOBEL Multilayer resilienceWP2.1 19-21 september 2005 Benoît LEMOINE France Telecom R&D

  2. Next generation Optical Networks for Broadband European Leadership NOBEL FT study on multilayer resilience • Multilayer network scenario description • Single layer distributed restoration performance • Multilayer restoration triggering • Conclusions

  3. Next generation Optical Networks for Broadband European Leadership NOBEL Multilayer network scenario (1/2) • Multi layer network • Higher layer network : IP/MPLS with TE extensions • Lower layer network : SDH with ASON functions • Adaptation between layer networks • IP/MPLS traffic is multiplexed into • Generic Framing Procedure (G.7042), • over SDH Virtual Concatenation (G.707). • SDH VC4-xv Virtual Concatenation Groups are supported by • SDH VC4 network connections, • using Link Capacity Adjustment scheme (G.7041) to adapt the VCG size to the number of active VC4.

  4. Next generation Optical Networks for Broadband European Leadership NOBEL Multilayer network scenario (2/2) • Types of Quality of Resilience • A Services with very small tolerable interruption time • supported by 1+1 protected NC. • B Services with guaranteed bandwidth, tolerating short interruptions • carried by restorable MPLS-TE LSP over VCG with restorable NC. • C Services with no guaranteed bandwidth, tolerating short interruptions • carried by basic restorable MPLS LSP over VCG with restorable NC. • D Services with no guaranteed bandwidth, tolerating large interruptions • carried as IP traffic, without any MPLS LSP, on the shortest network path. • Study focuses on the choice between • Restore MPLS-TE LSP ? • Restore MPLS LSP ? • Restore NC ?

  5. Next generation Optical Networks for Broadband European Leadership NOBEL Considered Types of QoR MPLS-TE LSP LSP LSP MPLS IP MPLS Restoration VC4-xv VC4-xv GFP GFP VCAT+LCAS VCAT VC4 VC4 VC4 VC4 VC4 VC4 SDH Restoration SDH 1+1 Protection STM STM QoR B, C and D QoR A (not considered)

  6. Next generation Optical Networks for Broadband European Leadership NOBEL Single layer restoration • Distributed restoration performance on 10-20 nodes network • Distribution approximated by • Histogram approximated by • The restoration time constant T increases linearly with the number of network connections to restore at the same time

  7. Next generation Optical Networks for Broadband European Leadership NOBEL Multilayer restoration triggering • Minimize the number of NC and LSP to restore • Suggested iterative scheme • 1 If no MPLS-TE LSP or MPLS LSP do not restore NC. • 2 If only MPLS LSP are carried over the VCG restore at most one NC. • 3 If MPLS-TE LSP and MPLS LSP are carried over the virtual concatenation group, and the remaining VCG bandwidth is smaller than the sum of bandwidth reserved for MPLS-TE LSP • a. If the highest bandwidth reserved by an MPLS-TE LSP is higher than the incremental bandwidth offered by a single NC, restore that MPLS-TE LSP. Go to step 2. • b. If not, then restore as many NC as needed to reach the total reserved bandwidth.

  8. Next generation Optical Networks for Broadband European Leadership NOBEL Multilayer restoration triggering • Restore NC in two steps • Suggested iterative scheme • 1 If no MPLS-TE LSP or MPLS LSP do not restore NC. • 2 If only MPLS LSP are carried over the VCG restore at most one NC. • 3 If MPLS-TE LSP and MPLS LSP are carried over the virtual concatenation group, and the remaining VCG bandwidth is smaller than the sum of bandwidth reserved for MPLS-TE LSP • a. If the highest bandwidth reserved by an MPLS-TE LSP is higher than the incremental bandwidth offered by a single NC, restore that MPLS-TE LSP. Go to step 2. • b. If not, then restore as many NC as needed to reach the total reserved bandwidth. • 4 After a proper temporisation, restore the still impacted NCs.

  9. Next generation Optical Networks for Broadband European Leadership NOBEL Conclusions • Performance of a single layer distributed restoration • Increases with the number of Network Connections to restore. • Multilayer restoration triggering • Restore MPLS-TE LSP for which reserved bandwidth is higher than the basic SDH Network Connection bandwidth (i.e. 155 Mbps). • Restore SDH NC to protect basic MPLS LSP and MPLE-TE LSP for which reserved bandwidth is lower than SDH NC bandwidth. • Split impacted SDH NC in two sets • Restore immediately the first set of NC needed to satisfy QoR. • Restore after a proper temporisation the second set of NC to increase non guarantied bandwidth back to the highest possible value without any time constraints. • Implementation • Coordination between SDH network and MPLS network is needed.

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