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Configuring AppleTalk Services
1-6
117366-A Rev. A
AppleTalk Address Resolution Protocol (AARP)
For a Bay Networks AppleTalk router to forward a packet to a directly connected
AppleTalk node, the router needs to know the
• Packet’s AppleTalk address
• Corresponding hardware address of the node where the AppleTalk address
resides
The router uses the AppleTalk Address Resolution Protocol (AARP) to map
AppleTalk addresses to their equivalent hardware addresses. The router saves this
information in its address mapping table (AMT), which lists all known AppleTalk
addresses, corresponding hardware addresses, and the circuit/port where the
address resolution is in effect.
The router updates and maintains its AMT by broadcasting and receiving AARP
packets (F
igure 1-3). When the router needs to send a packet to a given AppleTalk
address, it scans its AMT to find the address. If the address is not found, the router
broadcasts a single
Request
packet to find out which node is using the address.
If the address exists, the node whose address matches that specified in the Request
packet sends back a
Response
, which identifies the hardware address that maps to
the AppleTalk address. The router then updates its AMT with this new
information. The router waits 2 seconds for a response.
AARP is also responsible for generating a unique AppleTalk address for each of
the router’s AppleTalk interfaces that have not been explicitly assigned. This
process is called
probing
. The Bay Networks AppleTalk router implements this by
first generating a tentative AppleTalk address for the interface in the format
<start_network_number>.<start_node_number>
where
•
<start_network_number>
is the lowest end of the network number range
assigned to the network to which this interface connects.
•
<start_node_number>
is a randomly selected node number that could be
assigned to this 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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