3com 520 User Manual

 

 

 

Novell IPX also uses RIP for routing purposes. 

 

Although it is similarly named to the IP equivalent, it 

 

uses a different protocol. IPX RIP broadcasts 

 

datagrams out onto the network every sixty 

 

seconds. Upon receipt of a RIP datagram, a router 

 

adds one to the hop count of each route advertised 

 

and broadcasts a RIP datagram to the other 

 

networks, with which it is connected.

 

The cost of a route in an IPX network is determined 

 

by the metric known as 

 

. In a LAN only 

 

environment this is the hop count plus one, e.g. 

 

three hops or four ticks. For an internetwork 

 

connected via a WAN or ISDN links, the tick count is 

 

factored on the speed of the WAN link.

 

We saw above the common network numbering 

 

scheme employed for a bridged network. By 

 

employing routing, LAN A, LAN B and LAN C become 

 

three separate networks on a network. The network 

 

numbering must reflect that situation.

 

In a Novell IPX environment we could allocate IPX 

 

network numbers 00000111 to LAN A, 00000222 to 

 

LAN B and 00000333 to LAN C. Having configured 

 

the ports of the OfficeConnect Remote to accept 

 

this protocol, routing will now occur between the 

 

remote network servers and workstations but 

 

addressed by different network numbers.

 

It should be noted that NetWare 3.X and later, uses 

 

the concept of internal IPX addresses, which is 

 

somewhat similar to network addressing. The 

 

internal address refers to the internal network within 

 

that server allowing internal processes to 

 

communicate. These numbers must be unique for 

 

all servers right across the network. Although 

 

network servers may appeared wired correctly, and 

 

in other respects seem to be working correctly, 

 

duplicated internal IPX addresses will not allow 

 

correct operation.

 

NetWare has a hop count limitation imposed by the 

 

RIP. On an IPX network a data packet can cross a 

 

maximum of fifteen routers before being discarded.

Rc.bk : RCAPPA.FRM  Page 11  Thursday, July 10, 1997  9:53 AM