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C5-8
893-741-B
Network Protocols
Local Area Transport (LAT) Protocol
The Local Area Transport (LAT) protocol multiplexes low-speed user data over a high-speed local
area network (LAN). The LAT protocol bypasses the LAN’s session, transport, and routing layers.
the Model 5390 implementation of LAT provides communications service management and
load-balancing over many LAT machines advertising the same named-service.
Advertised Services
Advertised services are the announcements of resources (modems, printers, etc.) that LAT machines
have available for use by the network clients. These messages are called service announcements. A
service announcement carries the name and Ethernet address of the server offering the service, along
with a current service rating. Any host that accepts session requests is a service provider. All service
providers broadcast service announcements periodically (typically once per minute).
A host can provide multiple services. When a user broadcasts a service request and there are multiple
providers of that service, the Model 5390 server logs the user onto the host with the highest service
rating.
Learned Services
Learned services are the services that a LAT machine hears and stores from the network. All services
received by a LAT machine are filtered based on the group codes in the service announcement and
the access group code of the LAT receiving machine.
Each LAT machine has a group code mask that represents the allowable groups for users of that
machine. To store a service announcement, there must be at least one group code common between
the advertising machine and the receiving machine.
Group Codes
Service providers can be assigned a LAT group code. Group codes partition the LAT network
logically into subsets. The Model 5390 server restricts clients to the assigned group code(s). Group
codes can enhance both network security and network management.
Содержание 5390
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Страница 44: ...893 741 B Preface xliv ...
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Страница 60: ...A1 12 893 741 B Introduction to the Model 5390 Server ...
Страница 106: ...A3 18 893 741 B Configuring Ports ...
Страница 142: ...A5 12 893 741 B Printers ...
Страница 152: ...A6 10 893 741 B Modems ...
Страница 168: ...A7 16 893 741 B Serial Line Internet Protocol SLIP ...
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Страница 506: ...A15 86 893 741 B Using Model 5390 Security ...
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Страница 508: ... Chapter B1 Network Administration Chapter B2 Simple Network Management Protocol SNMP Part B Network Administration ...
Страница 544: ...B1 36 893 741 B Network Administration ...
Страница 574: ...B2 30 893 741 B Simple Network Management Protocol SNMP ...
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Страница 606: ...C1 30 893 741 B na Commands ...
Страница 676: ...C2 70 893 741 B Configuration Parameters ...
Страница 772: ...C3 96 893 741 B Using the CLI Commands ...
Страница 794: ...C5 12 893 741 B Network Protocols ...
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Страница 796: ... Appendix D1 Software Reference Part D Appendixes ...