Operation Manual

Basic Design of ISDN-WANs and Configuration Overview 75
Routing Protocol to Choose for the Respective Network Protocols
♦♦ IPX - RIP/SAP, NSLP
For IPX, the routing protocols RIP/SAP and NLSP are supported.
RIP/SAP is a distance vector-based routing protocol implementa-
tion. RIP/SAP consistently exchanges routing and services informa-
tion, i.e. updates routing and services tables in a periodic manner.
This is done per default every 60 seconds, whether changes appear
or not, and, in addition, exchanges information each time a change
occurs. The following mechanisms are implemented to reduce traffic
produced by this routing protocol.
- RIP/SAP Periodic Update Timer
With RIP/SAP Periodic Update Timer you can - and over ISDN
you must - change the default of 60 seconds for exchange of
routing and services information to a higher value, best to the
max. value of 84 hours. However, since this would imply that
network changes would as well only be updated every 84 hours
and not at the time the change occurs, RIP/SAP on change is
implemented as an underlying mechanism.
- RIP/SAP Only On Change mechanism
This mechanism does not have to be configured, it is always
active and guarantees that the network changes are transmitted
whenever they occur. It works independend of the update of all
routing and services tables defined through RIP/SAP Periodic
Update Timer.
NLSP is a link state protocol implementation. NLSP exchanges
routing and services information only when network changes occur.
NSLP further uses Non Broadcast or WAN LSP Hello packets to
reassure that the remote side of the link is available. The following
mechanisms are implemented to reduce traffic produced by this
routing protocol:
- Non Broadcast Hello Timer Interval
The Non Broadcast Hello Timer Interval defines the frequency of
WAN LSP Hello packets. This timer can be set per router. The
default value is 20 seconds, but does not have to be changed if
you decide to use NLSP instead of RIP/SAP or static routes, since
LSP Hello Spoofing is provided.
configuration overview.pm6 28.05.97, 00:0375