EVC structure for a Protected ELine service Maarten

EVC structure for a Protected E-Line service Maarten Vissers 2010 -11 -23

Introduction The following slides illustrate the structure of an EVC which is set up to support a protected E-Line service in q One Carrier network (X) q Two Carrier networks (X, Y) Each Carrier network includes access, metro and core domains EVC is set up with Dual Node Interconnections between domains and between Carrier Networks q Between access/metro and metro/core domains two nodes are used to interconnect q Between carrier X/carrier Y networks four nodes are used to interconnect EVC is not loop free and it is required to block forwarding of VLAN frames on the alternative paths q This is normal behavior within protected P 2 P connections

Carrier X Network 1 3 5 UNI A Metro (EVC ring) Access 2 4 EVC Terminating or Bridging Node Core (full mesh of virtual links) 6 Ethernet physical link 7 9 Metro (partial mesh of virtual links) 8 UNI Access B 10 Ethernet virtual link EVC set up in Carrier X Network DNI Protected P 2 P EVC 1 3 5 VLAN frame in EVC 7 9 UNI A block forwarding of frames in EVC B 2 4 6 8 10 Dual-node-interconnect protected P 2 P EVC in Carrier X network

1 3 5 UNI A Core (full mesh) Carrier X Network Metro (EVC ring) Access 2 4 6 11 12 E-NNI 13 14 7 Carrier Y Network 9 Metro (partial mesh) Core (full mesh) Access 8 EVC Terminating or Bridging Node Ethernet physical link UNI Ethernet virtual link 10 B

EVC set up in Carrier X and Y Networks 1 3 5 VLAN frame in EVC UNI Carrier X Network A block forwarding of frames in EVC 2 4 6 11 DNI Protected P 2 P EVC 12 E-NNI 13 14 7 9 UNI Carrier Y Network B 8 10 Dual-node-interconnect protected P 2 P EVC in Carrier X and Y networks