Hi, I have some doubts about the minimal configuration to handle an SDH 1+1 protected circuit with OSPF on a single Juniper router platform (one interface as the Working Circuit and another interface as the Protect Circuit). Reading the JunOS documentation, for instance the 9.4 JunOS version: http://www.juniper.net/techpubs/software/junos/junos94/swconfig-network-inte... and using the various configuration snippet I tried to link together various pieces of configuration and the result is below: so-0/2/0 { framing { sdh; } sonet-options { aps { working-circuit bayward; authentication-key blarney; } } unit 0 { family inet { address 10.100.100.1/24; } } } so-1/3/0 { framing { sdh; } sonet-options { aps { protect-circuit bayward; authentication-key blarney; } } unit 0 { family inet { address 10.100.200.1/24; } } } lab@r1# show protocols ospf area 0.0.0.0 { interface so-0/2/0.0; interface so-1/3/0.0; } } If I'm not wrong the APS/MSP signaling protocol router implementation should set one of the two sonet interfaces as Up and the other as Down, so the OSPF should install in routing table only the IP network related to the Up interface. Am I wrong? Do you think I forgot some configuration pieces? Thanks and regards, Lorenzo