Avaya Configuring AppleTalk Services Bedienungsanleitung Seite 24
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Configuring AppleTalk Services
1-8
117366-A Rev. A
Next, the router checks the validity of the address by broadcasting 10 AARP
probe packets containing this address at 0.2-second intervals. (For WAN
interfaces, the frequency is five AARP packets at 1.0-second intervals.) AARP
probe packets inquire if any other node on the network is already using this
address. If the router does not receive a response, then it knows that the address is
unique on the network and assigns the address to the interface. If the router
receives a response (or a probe for the same address), it knows the address is
already in use. So the router increments the node number by 1, then sends out 10
more probes. It repeats this process until it does not receive a response, or runs out
of all possible node numbers.
If the router runs out of possible node numbers, it increments the
start_network_number
by 1 and repeats the entire probe process. Finally, if the
router is still unable to generate a unique address, it logs the error and shuts down
the interface.
Datagram Delivery Protocol (DDP)
The Bay Networks AppleTalk router uses the Datagram Delivery Protocol (DDP)
to transmit packets between nodes on the network. The Datagram Delivery
Protocol is an unreliable network layer protocol.
An AppleTalk datagram consists of the DDP header, immediately followed by the
data. The Bay Networks router encapsulates all packets in an extended 13-byte
DDP header (F
igure 1-4). The source node sets the hop count field to zero before
sending a packet out onto the network. Each router that receives the packet
increments the hop count by one until it either reaches the destination end node, or
reaches the maximum hop count (15), in which case it is discarded.
Note: If you statically configure the AppleTalk interface’s address (setting the
network ID and node ID to a nonzero value) and another AppleTalk device has
already acquired this address, the router logs a message indicating that the
address is already in use. The router cannot bring up such an interface.
- 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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