Avaya Configuring Interface and Router Redundancy Uživatelský manuál Strana 33
- Strana / 92
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
Router Redundancy Overview
114079 Rev. B 2-5
Table 2-2. Redundancy Protocol PDU Flow Diagram for SOS PDUs
Router A PDU Router B
Router A, currently the primary router,
sends Primary Hello PDUs at periodic
intervals.
Hello PDU
Role = Primary
---------------->
Router B, currently a secondary router,
receives the periodic Primary Hello
PDUs and updates the redundancy
group database.
Router B restarts the Primary OK Timer.
Receives the periodic Hello PDUs and
updates the redundancy group data-
base.
Hello PDU
Role = Secondary
<----------------
Router B sends periodic Hello PDUs.
Router A detects local partial failures; for
example, an important interface has
failed. Router A knows that Router B is a
better primary router, so Router A plans
to change its role to secondary.
Router A issues an SOS PDU to inform
all members of the redundancy group of
its intention to change out of the primary
role.
SOS PDU
Role = Primary
---------------->
Router B, the best secondary router,
receives the SOS PDU, and confirms
that it is the best secondary router by
sending the SOS Reply PDU.
Router A, the current primary router,
receives the SOS Reply PDU with its OK
indication from Router B.
SOS Reply PDU
Role = Secondary
<----------------
Router B sends the SOS Reply PDU,
indicating that it is ready to be the new
primary router, and that it is OK for the
current primary router to change out of
the primary role.
Router A sends an SOS Primary Good-
bye PDU, then changes out of the
primary role.
SOS Primary
Goodbye PDU
Role = Primary
---------------->
Router B receives the SOS Primary
Goodbye PDU.
Router A may not receive this PDU, but
all other members of the redundancy
group do. This message tells the other
secondary members to delay bidding for
the new primary role until after the bid-
ding timer expires and they detect that
there is no primary router.
SOS New Primary
PDU
Role = Secondary
<----------------
Router B sends the SOS New Primary
PDU to indicate that it is changing roles
to become the new primary router.
Router B changes its role to become the
new primary router.
Router A may not receive this PDU. All
other members of the redundancy group
do, and update their redundancy group
databases.
Hello PDU
Role = Primary
<----------------
Router B has finished the role change
and is now the new primary router.
Router B sends its first periodic Primary
Hello PDU.
- 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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