HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 89
Configuring single-hop echo detection, Configuring OSPF FRR
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Step 2. Enter interface view. Command interface interface-type interface-number 3. Enable BFD bidirectional control detection. ospf bfd enable Remarks N/A By default, BFD bidirectional control detection is disabled. Both ends of a BFD session must be on the same network segment and in the same area. Configuring single-hop echo detection Step 1. Enter system view. Command system-view 2. Configure the source address of echo packets. bfd echo-source-ip ip-address 3. Enter interface view. 4. Enable BFD single-hop echo detection. interface interface-type interface-number ospf bfd enable echo Remarks N/A By default, the source address of echo packets is not configured. N/A By default, BFD single-hop echo detection is disabled. Configuring OSPF FRR A link or router failure on a path can cause packet loss and even routing loop until OSPF completes routing convergence based on the new network topology. FRR uses BFD to detect failures and enables fast rerouting to minimize the impact of link or node failures. Figure 19 Network diagram for OSPF FRR In Figure 19, configure FRR on Router B by using a routing policy to specify a backup next hop. When the primary link fails, OSPF directs packets to the backup next hop. At the same time, OSPF calculates the shortest path based on the new network topology, and forwards packets over the path after network convergence. You can configure OSPF FRR to calculate a backup next hop by using the loop free alternate (LFA) algorithm, or specify a backup next hop by using a routing policy. 78
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