Information Technology Reference
In-Depth Information
Table8-3
Novell IPX: Client Cannot Connect to Server over PSN (continued)
Possible Problem
Solution
Hub router not
forwarding SAPs
(Frame Relay
only)
In a Frame Relay hub-and-spoke topology, SAPs received on one
of the hub router's interfaces will not be forwarded back out the
same interface because of the split horizon rule, which states that
an incoming packet cannot be placed on the same network
interface from which it originated, preventing an infinite routing
loop if a link fails.
To allow SAPs to be forwarded appropriately, you must
configure subinterfaces on the Frame Relay interface of the hub
router. Assign a subinterface to each spoke site. The hub router
will treat each subinterface as a physical interface, allowing it to
advertise SAPs without violating the split horizon rule. For
specific information on configuring subinterfaces, see the
Wide
Area Networking Configuration Guide
.
Note: Other problems can prevent a router from forwarding SAP
packets. For more information, see the section “IPX RIP: SAP
Updates Not Propagated by Router,” later in this chapter.
Missing or
misconfigured
multicast address
(SMDS only)
1.
Use the
show running-config
privileged exec command to
view the router configuration. Check for an
smds multicast
ipx
interface configuration command entry.
2.
If the command is not present, add it to the configuration. If
the command is present, confirm that the multicast address
configured is correct. The SMDS multicast address is
specified by your SMDS provider.
1.
You can eliminate the need for Frame Relay address maps by using Inverse ARP instead. Use the
frame-relay interface-dlci
dlci
broadcast
interface configuration command to configure an interface
to use Inverse ARP. For more information about the use of this command, refer to the
Cisco IOS
Wide-Area Networking Configuration Guide
and
Wide Area Networking Command Reference.
2.
DLCI = data-link connection identifier
3.
SMDS = Switched Multimegabit Data Service
4.
HDLC = High-Level Data Link Control
5.
LMI = Local Management Interface
Novell IPX: Client Cannot Connect to Server over ISDN
Symptom:
Clients cannot connect to servers over an ISDN link. Clients can connect to local servers.
Procedures for troubleshooting connectivity problems not specific to ISDN environments are described
in the section “Novell IPX: Client Cannot Connect to Server on Remote LAN,” earlier in this chapter.
Procedures for troubleshooting ISDN connectivity problems not specific to IPX environments are
described in Chapter 17, “Troubleshooting ISDN Connections.”
