Static Routes And Services - Intel ER8100STUS - Express 8100 Router Reference Manual

Implementation
SAP Rx Filters
SAP Tx Filters

Static Routes and Services

Static routes and
services
Use of static routes and
services over WAN links
SAP filters are implemented for both WAN and LAN router links, and are imple-
mented for both received (Rx) and transmitted (Tx) service access information.
SAP Rx Filters can be used to remove selected incoming service access informa-
tion before it is entered into the service information table for the router. Services
removed in this way are not be accessible via the router, and the service informa-
tion is not passed on to other routers.
SAP Tx Filters can be used to remove selected service access information before
it is passed on to other routers. Services removed in this way are accessible via
the router but the service information is not passed on to other routers.
A static route is a route to a destination network which is always known to the
router and does not need to be announced to the router using the Routing Infor-
mation Protocol (RIP). Similarly, a static service is a service which is always
known to the router and does not need to be announced to the router using the
Service Access Protocol (SAP). Static routes and services are still announced to
other routers using RIP and SAP as usual.
By establishing static routes and services over a WAN link and disabling RIP and
SAP, no routing or service information is sent on the WAN link. This maximizes
the available bandwidth for data communications, and for many WAN link types
it reduces the costs of operation. Static routes are often used to prioritise the uses
of WAN links for routing.
If RIP and/or SAP is disabled over a WAN link, static routes and ser-
Note
vices to all the networks and services over the WAN link must be estab-
lished. The router may not be able to discover them otherwise.
When static routes and services are established, dynamic routing (using RIP and
SAP) is usually disabled. An exception to this is to provide remote access to a
network or service which is not otherwise announced to the router.
Novell IPX Routing
Static Routes and Services
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