Verilink 9000 Series (34-00271) Product Manual - Manual (Page 334)

312 C HAPTER 19: IPX R OUTER
Service Advertising
Protocol (SAP)
Summary
Description
While RIP allows for exchanging routing information, SAP provides routers and
servers a means of exchanging internetwork service information. With SAP, servers
advertise their services and addresses. The router saves this informations in its
SAP tables and shares it with other routers. Routers can then dynamically maintain
a database of internetwork service information.
Clients on the Network can then see what services are available to them and obtain
the address of the service they want to connect to. Basically, the client needs to
have this kind of information to establish a session with a server.
NetWare Link
Services Protocol
(NLSP) Summary
Description
NLSP is Novell's link-state routing protocol for IPX which has been developed to
address the limitations of the IPX Routing Information Protocol and Service
Advertisement Protocol (RIP/SAP). Because of their broadcast-oriented
architecture, RIP and SAP demand large amounts of bandwidth and do not scale
well. NLSP is a cousin of OSPF, but is derived from, and most closely related to,
the OSI IS-IS routing protocol. NLSP was designed and specified by Novell.
As a link-state routing protocol, NLSP fundamentally changes the way routing
information is handled in an IPX network. Each router in an NLSP area keeps a
complete topological map of the entire area network in its memory. As changes in
topology, such as link failures, are noticed, routers send multicast packets to the
other routers on the network advising them of the change. Routers receiving these
update packets execute the Dijkstra algorithm and recalculate their complete area's
topology. Bandwidth is also used more efficiently because routing updates
typically only occur during changes to the network (as opposed to the constant
repetitive broadcasts used by distance-vector routing protocols such as RIP).
RIP/SAP continues to be supported, not only to connect NLSP networks, but also
because some older devices only support these protocols.
IPX Router
Supported
Features The TXPORT IPX Router supports the following features:
IPX Support
RIP Support
SAP Support
NLSP Interoperable with Integrated Forwarding Database
Support
Static Route and Services Support
Datalink State Notification Support
IPX Type-20 Packet for NetBIOS services support
IPXWAN2 support
Full Get SNMP support