Avaya Configuring Interface and Router Redundancy Instrukcja Użytkownika Strona 31
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Router Redundancy Overview
114079 Rev. A 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 out 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. Router B
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 with 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
- Contents 5
- 114079 Rev. A vii 7
- 114079 Rev. A ix 9
- 114079 Rev. A xi 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- 114079 Rev. A xvii 17
- Bay Networks Customer Service 18
- Customer Service FTP 19
- World Wide Web 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- Interface Redundancy Overview 23
- Interface Roles 24
- Hot and Warm Standby 25
- Active Interface MAC Address 26
- Chapter 2 27
- Router Redundancy Overview 27
- Redundancy Protocol 28
- 2-4 114079 Rev. A 30
- Role Change 32
- Bypassing the Bidding Process 33
- Chapter 3 35
- Implementation Notes 35
- Protocols Supported 36
- LAN Interfaces 36
- Clear Function 38
- Compatibility 38
- Chapter 4 39
- 114079 Rev. A 40
- 114079 Rev. A 4-3 41
- 4-4 114079 Rev. A 42
- 114079 Rev. A 4-5 43
- Chapter 5 45
- Configuring Router Redundancy 45
- Enabling Router Redundancy 46
- 114079 Rev. A 5-3 47
- (Figure 5-3) 48
- Click on OK 49
- (Figure 5-4) 49
- 51
- Configuring Router Redundancy 53
- 5-10 114079 Rev. A 54
- Configuring Resources 55
- Click on Add 56
- (Figure 5-7) 56
- 5-14 114079 Rev. A 58
- 114079 Rev. A 5-15 59
- 5-16 114079 Rev. A 60
- 114079 Rev. A 5-17 61
- 64
- Removing Router Redundancy 65
- Appendix A 67
- A-2 114079 Rev. A 68
- RRE0001A 69
- Possible Scenarios 70
- Possible Complications 71
- Router A Router B 72
- Router C 72
- RRE0002A 72
- Router Redundancy Examples 73
- B-6 114079 Rev. A 74
- Appendix C 75
- C-2 114079 Rev. A 76
- 114079 Rev. A Index-1 77
- 114079 Rev. A Index-3 79
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