R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

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Configuring static route FRR
A link or router failure on a path can cause packet loss and even routing loop. Static route fast reroute
(FRR) enables fast rerouting to minimize the impact of link or node failures.
Figure 1 Network diagram
As shown in Figure 1, upon a link failure, packets are directed to the backup next hop to avoid traffic
interruption. You can either specify a backup next hop for FRR or enable FRR to automatically select a
backup next hop (which must be configured in advance).
Configuration guidelines
• Do not use static route FRR and BFD (for a static route) at the same time.
• Static route does not take effect when the backup output interface is unavailable.
• Equal-cost routes do not support static route FRR.
• The backup output interface and next hop cannot be modified, and cannot be the same as the
primary output interface and next hop.
• Static route FRR is available only when the state of primary link (with Layer 3 interfaces staying up)
changes from bidirectional to unidirectional or down.
Configuration procedure
Configuring static route FRR by specifying a backup next hop
Ste
p
Command Remarks
1. Enter system view.
system-view N/A