Operation Manual

76 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
- LSP Hello Spoofing
With LSP Hello Spoofing, LSP Hello packets are not transmitted
to the remote end of each NLSP link over ISDN, but are spoofed
locally on each router.
NLSP is the more advanced routing protocol implementation,
especially when compared in design with distance-vector protocol
implementations, which are of older style technology. However, the
following restriction must be considered:
- The current version of NLSP does not support interarea (level 2)
routing, and routes or services cannot be filtered within a routing
area but between areas at the area boundaries.
You can create routing areas by running RIP on the network inter-
faces that link the areas, and therefore filtering of routes and services
over an ISDN link can be applied if NLSP is used in the LAN and
RIP/SAP is used over ISDN. Thus, although NLSP is the more
advanced routing protocol implementation, it has some drawbacks
as of today and the RIP/SAP mechanisms described above overcome
the major problem of this distance-vector protocol, i.e. the frequent
update of routing tables and services. Therefore, when compared
with IPX RIP/SAP, NLSP does not bring advantages over ISDN for
most standard internetworking scenarios as of today.
Recommendation
For IPX over ISDN, IPX RIP/SAP is the recommended routing
protocol.
♦♦ TCP/IP - RIP I, RIP II, EGP and OSPF
For TCP/IP, the routing protocols RIP I, RIP II, EGP and OSPF are
supported.
RIP is a distance vector-based routing protocol implementation. RIP
consistently exchanges routing information, i.e. updates routing
tables in a periodic manner. This is done per default every 60 sec-
onds, whether changes appear or not. No mechanisms are imple-
mented to reduce traffic produced by this routing protocol. Thus, do
not use RIP over ISDN if your connections are charged by connec-
tion time. RIP II is an extension of RIP allowing to transmit subnet
information.
configuration overview.pm6 28.05.97, 00:0376