Avaya Configuring AppleTalk Services Uživatelský manuál Strana 36
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Hodnocené. / 5. Na základě hodnocení zákazníků
Configuring AppleTalk Services
1-20 117366-A Rev. A
When two exterior routers establish a connection via an AURP tunnel, they
exchange complete routing information. Once the initial routing exchange takes
place, there are no more complete routing table exchanges.
Instead, an exterior router only generates routing updates when an event occurs
that changes its routing information, thus reducing the amount of routing protocol
traffic on the network. (Events that change routing information include network
additions or deletions, metric changes, and next-hop changes.) In addition, the
exterior router buffers updates until the next update interval occurs for the AURP
connection.
Hop Count Reduction
When two AppleTalk networks communicate via a tunnel, the distance one of
their packets must go to reach its destination can easily exceed the AppleTalk
15-hop limit. To ensure full access to resources beyond 15 hops, AURP provides a
way to reduce the hop count within the DDP header of an AppleTalk packet. With
Hop Count Reduction enabled, all nodes across the network appear reachable
within the AppleTalk 15-hop limit.
Upon receiving an AppleTalk packet through a tunnel configured with Hop Count
Reduction, AURP routers examine the routing table entry for that packet’s
destination network. If the destination network’s distance plus the packet’s hop
count exceed 15 hops, the AURP router reduces the hop count value of the packet
to ensure delivery of the packet.
For example, an AppleTalk router with AURP configured receives an
IP-encapsulated packet with a DDP header hop count field containing a value of 7.
Prior to sending the packet to its final destination, the router checks the
appropriate distance metric in its RTMP table and determines that the packet must
travel another 10 hops to reach its final destination. The AppleTalk router then
resets the hop count field of the DDP header to a value of 5, allowing the packet to
reach its destination within the AppleTalk router’s local network.
When using Hop Count Reduction on a tunneling port, an exterior router must
represent all networks in its local internet as being only one hop away. Hop count
reduction allows the router to send and maintain routing information about
networks beyond the 15-hop limit, thus ensuring full connectivity.
- Configuring AppleTalk 1
- Services 1
- Contents 5
- 117366-A Rev. A 10
- About This Guide 13
- Conventions 14
- Acronyms 14
- Bay Networks Customer Service 16
- How to Get Help 16
- Chapter 1 17
- AppleTalk Overview 17
- AppleTalk Addresses 18
- AppleTalk Zones 20
- Figure 1-4. DDP Packet 25
- 1-10 117366-A Rev. A 26
- Figure 1-5. RTMP Data Packet 26
- 1-12 117366-A Rev. A 28
- Name Binding Protocol (NBP) 29
- AppleTalk Echo Protocol (AEP) 30
- 1-18 117366-A Rev. A 34
- 1-20 117366-A Rev. A 36
- For More Information 37
- Chapter 2 39
- 2-2 117366-A Rev. A 40
- 117366-A Rev. A 2-3 41
- 2-4 117366-A Rev. A 42
- 117366-A Rev. A 2-5 43
- Specifying Interface Costs 44
- 117366-A Rev. A 2-7 45
- APT0013A 45
- Interface 46
- 117366-A Rev. A 2-9 47
- Using AppleTalk Zone Filters 48
- 117366-A Rev. A 2-11 49
- 2-12 117366-A Rev. A 50
- 117366-A Rev. A 2-13 51
- 2-14 117366-A Rev. A 52
- 117366-A Rev. A 2-15 53
- 2-16 117366-A Rev. A 54
- 117366-A Rev. A 2-17 55
- 2-18 117366-A Rev. A 56
- 117366-A Rev. A 2-19 57
- 2-20 117366-A Rev. A 58
- 117366-A Rev. A 2-21 59
- 2-22 117366-A Rev. A 60
- 117366-A Rev. A 2-23 61
- 2-24 117366-A Rev. A 62
- 117366-A Rev. A 2-25 63
- 3-3 Engineering (Rule 1) 63
- 2-26 117366-A Rev. A 64
- Token Ring Networks 65
- 2-28 117366-A Rev. A 66
- Frame Relay Topology 67
- 2-30 117366-A Rev. A 68
- Topology 68
- AURP Information 69
- Setting the Update Rate 70
- 117366-A Rev. A 2-33 71
- 2-34 117366-A Rev. A 72
- Figure 2-22. Network Loop 72
- Setting Zone Filters 73
- Setting the Interface Cost 73
- 2-36 117366-A Rev. A 74
- Chapter 3 75
- Enabling AppleTalk Services 75
- 3-2 117366-A Rev. A 76
- 3-4 117366-A Rev. A 78
- Configuring the Zone List 79
- Click on Add 80
- 117366-A Rev. A 3-7 81
- Configuring AURP 82
- 117366-A Rev. A 3-9 83
- 117366-A Rev. A 3-11 85
- Chapter 4 87
- 4-2 117366-A Rev. A 88
- 4-6 117366-A Rev. A 92
- 4-8 117366-A Rev. A 94
- 4-10 117366-A Rev. A 96
- 117366-A Rev. A 4-13 99
- 117366-A Rev. A 4-15 101
- Editing the Zone Filter Type 103
- 4-18 117366-A Rev. A 104
- 117366-A Rev. A 4-19 105
- Globally Deleting AppleTalk 107
- 108
- 4-24 117366-A Rev. A 110
- Editing AppleTalk Parameters 111
- 4-28 117366-A Rev. A 114
- Appendix A 115
- AppleTalk Default Settings 115
- (continued) 116
- 117366-A Rev. A Index-1 117
- 117366-A Rev. A Index-3 119
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