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Configuring Interface and Router Redundancy
2-2 114079 Rev. B
Redundancy Protocol
Routers in a redundancy group all begin in the secondary role. A router assumes
the primary role according to the following criteria, and the redundancy protocol
considers the criteria in the following order:
1. Number of good interfaces
2. Number of reachable resources
3. Priority to become primary, which you configure
4. Lowest member ID (for further information, see the Member ID parameter in
Chapter 5)
For example, if two routers in a router redundancy group have the same number of
good interfaces, the protocol considers the number of reachable resources each
router has. But if one router has a larger number of good interfaces, that router
becomes primary without consideration of subsequent criteria.
The routers use a bidding process to determine which router becomes the primary
router. If the group has more than two members, the bidding process also
determines which of the backup routers is the best secondary router. The bidding
process consists of an exchange of messages called protocol data units (PDUs).
T
able 2-1 provides a detailed description of this process.
Table 2-1. Redundancy Protocol PDU Flow Diagram for Role Bidding
Router A PDU Router B
Starts in secondary role. Starts in secondary role.
Sends Hello PDUs at periodic intervals.
These PDUs start the bidding for the
primary role.
Hello PDU
Role = Secondary
---------------->
Receives Hello PDU from Router A and
stores its contents in the redundancy
group database.
Checks to see if Router A is a better
primary router; if so, Router B does not
plan to change roles.
Receives Hello PDU from Router B and
stores its contents in the redundancy
group database.
Checks to see if Router B is a better
primary router; if so, Router A does not
plan to change roles.
Hello PDU
Role = Secondary
<----------------
Starts sending Hello PDUs at periodic
intervals; these PDUs are Router B’s
bids for the primary role.
(continued)
- 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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