IPX/SPX Configuration and Management Manual

Protocol Interfaces and Services for NonStop™
IPX/SPX
IPX/SPX Configuration and Management Manual—425731-001
A-2
Service Advertising Protocol (SAP) Table
Service Advertising Protocol (SAP) Table
SAP allows service nodes, such as file, print, and database servers, to register their
services and addresses in SAP tables maintained by each server. The registration is done
through SAP broadcasts every 60 seconds. If the broadcast of a specific service stops, all
other servers purge the service from their SAP tables within about three minutes.
On the operating system, a copy of the SAP table is maintained by each IPXPROTO
process. The SCF STATUS SERVER command returns information about the SAP table
maintained by the IPXPROTO process.
Server applications use SAP to
•
Add an entry for the service in the SAP table, which is maintained by the
IPXPROTO process. The IPXPROTO process then propagates the entry to other
NetWare servers by broadcasts every 60 seconds. Clients then can view the
advertised NonStop™ Himalaya S-series service along with other services on the
network.
•
Delete an entry for the service in the SAP table.
•
Display servers of a specified type in the SAP table.
Each SAP table entry contains the following information:
Server name
is a string of up to 48 characters. The server name must be unique within the entire
NetWare internetwork. Certain characters (including / : ; , * + - ? ~) and spaces are
invalid.
Server type
is a unique number assigned to a class of servers, such as the NetWare file-server
class, various print server classes, and so on. Compaq has reserved a range of
server-type numbers for services such as Telserv and ODBC servers.
Table A-1
lists NonStop™ Himalaya S-series server types.
Note. For server applications, Compaq recommends that the server name include the
operating system name and the Guardian process name, for example, DAISY.$ODBC1.
This convention ensures that the server name is unique in the NetWare internetwork.
Table A-1. NonStop™ Himalaya S-Series Server Types
Server Type (in Hex.) Service
0474 ODBC Server (same as Sybase)
05C7 Telserv Server
05C8 - 05D0 Reserved for Compaq use
05D1 - 05D2 Reserved for Compaq customer use
(transaction servers)