HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 144
Configuring BFD for IS-IS, Configuring IS-IS FRR
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Step 5. (Optional.) Configure the T1 timer. 6. (Optional.) Configure the T2 timer. 7. (Optional.) Configure the T3 timer. Command graceful-restart t1 seconds count count graceful-restart t2 seconds graceful-restart t3 seconds Remarks By default, the T1 timer is 3 seconds and can expire 10 times. By default, the T2 timer is 60 seconds. By default, the T2 timer is 300 seconds. Configuring BFD for IS-IS BFD provides a single mechanism to quickly detect and monitor the connectivity of links between OSPF neighbors, reducing network convergence time. For more information about BFD, see High Availability Configuration Guide. To configure BFD for IS-IS: Step 1. Enter system view. 2. Enter interface view. Command system-view interface interface-type interface-number Remarks N/A N/A 3. Enable IS-IS on an interface. isis enable [ process-id ] N/A 4. Enable BFD on an IS-IS interface. isis bfd enable By default, an IS-IS interface is not enabled with BFD. Configuring IS-IS FRR A link or router failure on a path can cause packet loss and routing loop. These problems can continue until IS-IS completes the routing convergence based on the new network topology. IS-IS FRR uses BFD to detect failures and enables fast rerouting to minimize the impact of link or node failures. Figure 36 Network diagram for IS-IS FRR In Figure 36, after you enable FRR on Router B, IS-IS automatically calculates or designates a backup next hop when a link failure is detected. In this way, packets are directed to the backup next hop to reduce traffic recovery time. Meanwhile, IS-IS calculates the shortest path based on the new network topology, and forwards packets over the path after network convergence. You can either enable IS-IS FRR to calculate a backup next hop automatically, or designate a backup next hop with a routing policy for routes matching specific criteria. 133
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