3Com 4007, Implementation Manual, Page: 530 / 684

530 C
HAPTER
20: IPX R
OUTING
IPX SAP Mode
IPX SAP provides routers and servers that contain SAP mode agents with
a means of exchanging network service information. Through SAP,
servers advertise their services and addresses. Routers gather this
information and share it with other routers. With this process, routers
dynamically create and maintain a database (server table) of network
service information. Clients on the network determine what services are
available and obtain the network address of the nodes (servers) where
they can access those services. Clients require this information to initiate
a session with a file server.
You determine how SAP operations on your system with the ipx sap
mode option.
Important
Considerations
Consider the following guidelines before you use the ipx sap mode
option:
■
The Multilayer Switching Module has three SAP modes:
■
Off — The system does not process any incoming SAP packets and
does not generate any SAP packets of its own.
■
Passive — The system processes all incoming SAP packets and
responds to SAP requests, but it does not broadcast periodic or
triggered SAP updates.
■
Active — The system processes all incoming SAP packets,
responds to explicit requests for routing information, and
broadcasts periodic and triggered SAP updates.
■
The system has two SAP triggered modes for updates:
■
Disabled — Broadcasts IPX SAP server addresses 3 seconds after
learning them.
■
Enabled — Broadcasts IPX SAP server addresses immediately after
learning them.
SAP Policies Each router maintains a table of current configured services (the service
table). SAP receives information and advertises information about the
network nodes that provide these services. SAP policies control which
services the router places in the service table and advertises to the
network.