... (NSF), In-Service Software Upgrade (ISSU) and other technologies to improve services recovery and ensure uninterrupted service forwarding.• Network-level reliability ... The VPN FRR, E-VRRP, VLL FRR, Ethernet OAM, Y.1731, PW redundancy, E-Trunk, and E-Automatic Protection Switching ... and RRPP.Supports RRPP.Supports MPLS OAM and Ethernet OAM, Y.1731.Supports backup of service routers, PW redundancy, and ...