Chapter 8: Redundant Network Design; Physical Layer Redundancy; 100Base-Fx Fefi Recommendations - Avaya 8800 Planning And Engineering

Chapter 8: Redundant network design

Provide redundancy to eliminate a single point of failure in your network. This section provides guidelines
that help you design redundant networks.
Navigation
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Physical layer redundancy

• Platform redundancy
• Link redundancy
• Network redundancy
• Switch clustering topologies and interoperability with other products
Physical layer redundancy
Provide physical layer redundancy to ensure that a faulty link does not cause a service
interruption. You can also configure the switch to detect link failures.
Physical layer redundancy navigation
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100BASE-FX FEFI recommendations

• Gigabit Ethernet and remote fault indication
• SFFD recommendations
• End-to-end fault detection and VLACP
100BASE-FX FEFI recommendations
The Avaya Ethernet Routing Switch 8800/8600 supports Far End Fault Indication (FEFI). FEFI
ensures that link failures are reported to the switch. FEFI is enabled when the autonegotiation
function is enabled. However, not all 100BASE-FX drivers support FEFI. Without FEFI support,
if one of two unidirectional fibers forming the connection between the two switches fails, the
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