"IP Fast Reroute (IP FRR) for OSPF Using Loop-Free Alternate Routes This feature adds fast reroute capability for OSPF in M, MX and T Series routers and the TX Matrix. The Junos OS precomputes loop-free backup routes for all OSPF routes. These backup routes are preinstalled in the Packet Forwarding
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Junos 10.0 Release Highlights - Routing, Security, and Switching Platforms - Juniper Networks
