Avaya Configuring Interface and Router Redundancy Bedienungsanleitung Seite 75
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Router Redundancy Examples
308626-14.00 Rev 00
B-3
Possible Complications
The following sections describe complications that can occur when you use router
redundancy.
Router Boots and Cannot Detect Another Member
If a member of a router redundancy group boots and cannot detect any other
member of its redundancy group within the bidding period, it switches roles to
become the primary router, because it is the only member from which to select the
primary.
Second Router Boots After First Router’s Bidding Timer Expires
If the first router has booted and a second router boots after the first router’s
bidding period expires, the first router may be in the process of switching roles to
become the primary router. During the switching process, the first router does not
send PDUs, so when the second router boots and begins its own bidding period, it
may not detect the first router until the first router has completed the role switch.
To avoid a situation in which both routers switch roles to become primary, set the
bidding period for a longer time than the time required to perform a role switch.
Manual Versus Auto Role Switching
If the first router has booted and a second router boots after the first router’s
bidding period expires, and if you configured the router to use manual role
switching, the first router continues to act as the primary router even if the second
router would be a better primary. The software alerts you, and it is up to you to
initiate the role switch. If you configure the router to use auto role switching, the
routers perform the role switch automatically. If you configure the router to use
one-shot auto, the routers perform the role switch automatically once; after that a
switch occurs only when an interface fails or when a resource becomes
unreachable. If you configure the router to use switch on failure, a switch occurs
only when an interface fails or when a resource becomes unreachable.
During manual role switching, a secondary router switches its role to primary if it
does not detect a primary router in the group.
- Configuring Interface and 1
- Router Redundancy 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308626-14.00 Rev 00 11
- Before You Begin 13
- Text Conventions 14
- Acronyms 15
- Hard-Copy Technical Manuals 15
- How to Get Help 16
- Interface Redundancy Overview 17
- Chapter 1 17
- Interface Roles 18
- Active Interface MAC Address 19
- Chapter 2 21
- Router Redundancy Overview 21
- Redundancy Protocol 22
- Role Change 26
- Resource Availability 27
- Bypassing the Bidding Process 28
- Requirements 28
- Chapter 3 29
- Implementation Notes 29
- Protocols Supported 30
- LAN Interfaces 30
- Caution: 31
- Using the Clear Function 32
- Compatibility 33
- Chapter 4 35
- Select Edit Circuit 37
- Chapter 5 43
- Configuring Router Redundancy 43
- Enabling Router Redundancy 44
- Click on OK 47
- Configuring Resources 55
- Using Hot Standby 60
- Using Warm Boot 63
- 2:alpha.pri 67
- Removing Router Redundancy 69
- Appendix A 71
- Appendix B 73
- Router Redundancy Examples 73
- Possible Scenarios 74
- Possible Complications 75
- Figure B-3 77
- Fast Ethernet Switches 79
- Appendix C 81
- (continued) 82
- Appendix D 83
- BofL Parameters 83
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