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S12700 V200R013C00 Configuration Guide - Reliability

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, NSR Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, MAC Swap Loopback Configuration, EFM Configuration, CFM Configuration, Y.1731 Configuration.
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A link failure or topology change may lead to route recalculation. Therefore, the convergence time of routing protocols must be shortened as much as possible to improve network performance. A possible solution is to quickly detect link faults and immediately notify routing protocols of the faults.

BFD for OSPF associates a BFD session with OSPF. The BFD session quickly detects a link fault and notifies OSPF of the fault. OSPF quickly responds to the network topology change. Table 2-1 lists OSPF convergence time.

Table 2-1  OSPF convergence time

BFD Session

Link Fault Detection Mechanism

Convergence Time

Not bound

Timeout of the OSPF Hello keepalive timer

At the second level


BFD session in Down state

At the millisecond level


Figure 2-8  BFD for OSPF

In Figure 2-8, SwitchA establishes OSPF neighbor relationships with SwitchC and SwitchD. The outbound interface in the route from SwitchA to SwitchB is Interface 1. Packets from SwithA traverse SwitchC, and then reach SwitchB. When the OSPF neighbor is in Full state, the system instructs BFD to create a BFD session.

If a fault occurs on the link between SwitchA and SwitchC, the BFD session detects the fault and notifies SwitchA. SwitchA processes the neighbor Down event and recalculates the route. Interface 2 then becomes the new outbound interface in the route. Packets from SwitchA traverse SwitchD, and then reach SwitchB.

Updated: 2019-04-08

Document ID: EDOC1100065654

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