Lucent Technologies 6000 - Manual (Page 488)

12-2 MAX 6000/3000 Network Configuration Guide
Configuring IPX Routing
Introduction to IPX routing
identify callers. For that reason, use PAP and CHAP, which require password authentication,
unless you configure IP routing in the same Connection profile.
Note: If you have a MAX unit running Multiband Simulation, disable IPX routing.
IPX Service Advertising Protocol (SAP) tables
A MAX unit follows standard IPX SAP behavior for routers. However, when it connects to
another Lucent INS unit configured for IPX routing, the two units exchange their entire SAP
tables. Each unit immediately adds all remote services to its SAP table.
NetWare servers broadcast SAP packets every 60 seconds to make sure that routers (such as a
MAX unit) know about their services. Each router builds a SAP table with an entry for each
service advertised by each known server. When a router stops receiving SAP broadcasts from a
server, it ages its SAP-table entry for that server and eventually removes it from the table.
Routers use SAP tables to respond to client queries. When a NetWare client sends a SAP
request to locate a service, the MAX unit consults its SAP table and replies with its own
hardware address and the internal address of the requested server. The process is analogous to
proxy ARP in an IP environment. The client then transmits packets whose destination address
is the internal address of the server. When the MAX unit receives the packets, it consults its
RIP table. If it finds an entry for their destination address, it brings up the connection or
forwards the packets across the active connection.
IPX Routing Information Protocol (RIP) tables
A MAX unit follows standard IPX RIP behavior for routers when connecting to non-Lucent
units. However, when two Lucent INS units configured for IPX routing connect, they
immediately exchange their entire RIP tables. In addition, each unit maintains the imported
RIP entries as static until you reset or power cycle the unit. If the remote device to which the
MAX connects is a non-Lucent router, the MAX ages and removes the imported entries from
its routing table. The WAN link disconnects.
Note: In this chapter, RIP always refers to IPX RIP. IPX RIP is similar to the routing
information protocol in the TCP/IP protocol suite, but it is a different protocol.
The destination of an IPX route is the internal network of a server. For example, the network
administrator assigns NetWare file servers an internal IPX network number, and the servers
typically use the default node address of 000000000001. This is the destination network
address for file read/write requests. (If you are not familiar with internal network numbers, see
your NetWare documentation for details.)
IPX routers broadcast RIP updates both periodically and each time you establish a WAN
connection. The MAX receives RIP broadcasts from a remote device, increments the hop
count of each advertised route, updates its own RIP table, and broadcasts updated RIP packets
on connected networks in a split-horizon fashion.
A MAX unit recognizes network number –2 (0xFFFFFFFE) as the IPX RIP default route.
When the unit receives a packet for an unknown destination, it forwards the packet to the IPX
router advertising the default route. For example, if the unit receives an IPX packet destined
for network 77777777, and it does not have a RIP-table entry for that destination, it forwards
the packet toward network number FFFFFFFE, if available, instead of simply dropping the