Huawei Quidway NetEngine80E Configuration Manual page 239

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Networking Requirements
RIP detects neighbor status by sending Update packets periodically. By default, if receiving no
Update packets from its neighbor within six update intervals (180s), RIP considers its neighbor
Down. That is, RIP needs to take 180s to detect a link fault.
With the development of technologies, voice, video, and other VOD services are widely used.
These services are quite sensitive to packet loss and delay. Long-time fault detection will cause
packet loss. This cannot meet high reliability requirements of the carrier-class network. BFD
for RIP is used to resolve the problem. After BFD for RIP is configured, the link status can be
rapidly detected and fault detection can be completed in milliseconds. This speeds up RIP
convergence when the link status changes.
Because some devices on the network do not support BFD, One-Arm static BFD becomes very
important. One-Arm static BFD enables a device supporting BFD to create a BFD session with
another device that does not support BFD. It detects link faults quickly and accelerates network
convergence.
Use
l
l
l
Figure 3-5 Networking for One-Arm static BFD for RIP
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Configuration Roadmap
The configuration roadmap is as follows:
1.
2.
Data Preparation
To complete the configuration, you need the following data:
Issue 02 (2014-09-30)
Figure 3-5 as an example.
RIP is running between Router A, Router B, Router C, and Router D.
Service traffic travels through the primary link Router A → Router B → Router D.
One-Arm static BFD is enabled on the interface connecting Router A and Router B. When
the primary link fails, BFD can detect the fault quickly and notify the RIP module of the
fault. Service traffic is then switched to a secondary link.
RouterA
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RouterC
Configure basic RIP functions on each router to set up RIP neighbor relationships.
Enable global BFD on Router A. Enable One-Arm static BFD on the interface connecting
Router A and Router B.
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RouterB
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3 RIP Configuration
RouterD
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