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Configuring Interface and Router Redundancy
2-6 114079 Rev. B
Role Change
A router may change out of the primary role because of router failure, failure of
one or more interfaces, or because it cannot reach its resources.
Router Failure
If the primary router in a router redundancy group fails entirely, it obviously is no
longer the best primary router, and a role change occurs, as outlined in T
able 2-1
and T
able 2-2.
Interface Failure
If one or more interfaces on the primary router fail, it is probably no longer the
best primary router, depending on the status of the interfaces on the other routers
in the router redundancy group. If it is not the best primary router, it changes out
of the primary role.
BOFL Parameters and Role Change Speed for Ethernet
To increase the speed of detecting failed interfaces and changing roles on Ethernet
connectors, the software automatically shortens the values in the BOFL
parameters when you enable router redundancy. The relevant parameters are
BOFL Timeout, BOFL Retries, and BOFL Timeout Divisor.
When you enable BOFL, the router only sends BOFL messages if the interface is
idle. If the interface is transmitting regular data traffic, it does not send BOFL
messages.
The BOFL Retries parameter sets the number of BOFL messages the interface
transmits before the router declares the circuit down. The default value for router
redundancy is 4.
The number of seconds between BOFL messages is the value of the BOFL
Timeout parameter divided by the BOFL Timeout Divisor parameter. The default
value for the BOFL Timeout parameter is 5 seconds. When you enable router
redundancy, the software sets the default value of the BOFL Timeout Divisor
parameter to 10, and thereby shortens the interval between BOFL messages to 0.5
seconds.
- Configuring Interface and 1
- Router Redundancy 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- 114079 Rev. B 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- World Wide Web 19
- Customer Service FTP 19
- CompuServe 20
- Support Source CD 20
- How to Get Help 21
- Chapter 1 23
- Interface Redundancy Overview 23
- Interface Roles 24
- Hot Standby 25
- Active Interface MAC Address 26
- Chapter 2 29
- Router Redundancy Overview 29
- Redundancy Protocol 30
- 2-4 114079 Rev. B 32
- Role Change 34
- Requirements 35
- Chapter 3 37
- Implementation Notes 37
- Protocols Supported 38
- LAN Interfaces 38
- Compatibility 40
- Chapter 4 41
- Select Edit Circuit 43
- 4-4 114079 Rev. B 44
- 114079 Rev. B 4-5 45
- 114079 Rev. B 4-7 47
- Chapter 5 49
- Configuring Router Redundancy 49
- Enabling Router Redundancy 50
- 114079 Rev. B 5-3 51
- 5-4 114079 Rev. B 52
- Click on OK 53
- 5-6 114079 Rev. B 54
- 11. Click on OK 54
- 114079 Rev. B 5-7 55
- 56
- 5-10 114079 Rev. B 58
- Configuring Router Redundancy 59
- Configuring Resources 60
- 114079 Rev. B 5-13 61
- 5-16 114079 Rev. B 64
- 114079 Rev. B 5-17 65
- 5-18 114079 Rev. B 66
- 114079 Rev. B 5-19 67
- 69
- Removing Router Redundancy 71
- Appendix A 73
- A-2 114079 Rev. B 74
- Appendix B 75
- Router Redundancy Examples 75
- Possible Scenarios 76
- Possible Complications 77
- B-4 114079 Rev. B 78
- Fast Ethernet Switches 81
- Appendix C 83
- C-2 114079 Rev. B 84
- Appendix D 85
- BOFL Parameters 85
- D-4 114079 Rev. B 88
- 114079 Rev. B Index-1 89
- 114079 Rev. B Index-3 91
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