Avaya Configuring Interface and Router Redundancy User Manual Page 21
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Interface Redundancy Overview
1-3
During normal data transfer, if the active interface fails, the following interfaces
become active, in this order:
1. Redundant interfaces on the slot that is processing the routing/bridging table
for this circuit
2. Redundant interfaces on other slots
Role Change Speed on Ethernet
To increase the speed of detecting failed interfaces and changing roles on Ethernet
connectors, set the BOFL Timeout parameter to a short interval, such as one
second. The cost is LAN bandwidth and CPU overhead. To access the BOFL
Timeout parameter, select Lines
➔
Edit Lines in the Circuit Definition window. For
further information, refer to
Configuring Line Services
.
Hot and Warm Standby
When a redundant interface takes over for a failed interface without interruption in
service, it does so under one of two conditions:
hot
standby
or
warm standby.
Hot Standby
When the active interface fails, but the circuit is still up, the new active interface
retains access to the routing/bridging tables, and can continue transmission
immediately.
Only if the routing/bridging tables are on another slot from the new active
interface is there any loss in performance. The priority rules for interfaces to
become active operate to avoid this situation whenever possible.
Warm Standby
When the active interface fails and the circuit has gone down, the CPU module
processing the routing/bridging table is at fault, and the router loses the
routing/bridging tables.
Transmission continues, but is slower than in the case of hot standby, because the
new active interface must relearn the routing/bridging tables.
- Configuring Interface and 1
- Router Redundancy 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- About This Guide 13
- CompuServe 14
- InfoFACTS 15
- World Wide Web 15
- How to Get Help 16
- Conventions 16
- Acronyms 17
- Chapter 1 19
- Interface Redundancy Overview 19
- Interface Roles 20
- Hot and Warm Standby 21
- Active Interface MAC Address 22
- Chapter 2 23
- Router Redundancy Overview 23
- Redundancy Protocol 24
- Role Change 27
- Chapter 3 29
- Implementation Notes 29
- Protocols Supported 30
- LAN Interfaces 30
- Clear Function 32
- Compatibility 32
- Chapter 4 33
- Chapter 5 39
- Configuring Router Redundancy 39
- Click on OK 42
- Configuring Router Redundancy 45
- Configuring Resources 48
- Click on Add 49
- Removing Router Redundancy 58
- Appendix A 59
- Appendix B 61
- Router Redundancy Examples 61
- Possible Scenarios 62
- Possible Complications 63
- Router A Router B 64
- Router C 64
- Appendix C 67
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