Primary And Secondary Servers; Static Servers; Dynamic Servers Using Sap; Maintaining Server Information - 3Com corebuilder 3500 Implementation Manual

IPX Servers 435
You can set up both Primary and Secondary servers in the server table.
Primary and
Secondary Servers You can set up Secondary servers to serve as a backup to the Primary
server set up on the same IPX server.
To set up Secondary servers on your system, see the IPX chapter in the
Command Reference Guide.

Static Servers

Static servers are useful in environments in which no routing protocol is
used or when you want to override some of the servers that were
generated with a routing or server protocol. Because static servers do not
change in response to network topology changes, manually configure
only a small number of relatively stable servers.
Dynamic Servers Servers are automatically added to and removed from the information
table through SAP. This automatic SAP update helps you keep up with
Using SAP
changing network environments and allows servers to advertise their
services and addresses quickly and reliably.
As servers boot up, they advertise their services. When servers are
brought down, they use SAP to broadcast that their services are no longer
available.
Client systems do not use this server information directly. Instead, SAP
agents within each router on the server's network segment collect this
information. The SAP agents store information in their server information
tables. Client systems then contact the nearest router or file server SAP
agent to obtain server and service information.
On your system, you select a SAP mode to determine how SAP operates,
as described in "IPX SAP Mode" later in this chapter.
When a router's SAP agent receives a SAP broadcast response indicating a
Maintaining Server
Information change in a server's configuration, the agent updates its server
information table and informs other SAP agents. Examples of such a
change are when a server is disconnected or becomes accessible through
a better route.
The SAP agent immediately sends an update broadcast to all directly
connected network segments except the segment from which the
information was received. All future periodic broadcasts contain the
change information.