A R 7 2 0 R O U T E R Q U I C K S T A R T G U I D E
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3
Does the file server appear in the IPX service table of the
Remote Office router? If the server does not appear in the
table, its presence can not be advertised to the local LAN.
Check this by typing:
SHOW IPX SERVICE
This should produce a display like that shown on the previous
page. The important point is that the file server must appear in
the service table on the Remote Office router and there must
be a route to the file server’s internal network number. If there
is, and it still does not work, contact your distributor or
reseller for assistance.
4
Check the route tables on both routers, using the command:
SHOW IPX ROUTE
Check for the presence of networks on the remote side of the
wide area network. If the remote network is missing from the
route table on either router, use the command:
RESET IPX
which resets the IPX routing software and forces the routers
to broadcast their routing and service tables.
CONFIGURING IPX DIAL ON DEMAND
If the PPP link uses an ISDN call and has been configured as a
dial on demand link (see
Configuring ISDN Dial on Demand
earlier in this guide), then IPX can be configured for IPX dial on
demand services.
To configure IPX dial on demand, follow these steps:
1
Purge the IPX static database to clear an preexisting IPX
configuration and enable the IPX routing software on each
router, using the commands:
PURGE IPX
ENABLE IPX
2
On the Head Office router define two IPX circuits, one for
the Ethernet interface and one for the wide area link. Configure
the wide area link as a demand link and enable RIP and SAP
change broadcasts, using:
ADD IPX CIRC=1 INT=ETH0 NETW=401
ENCAP=802.3
ADD IPX CIRC=2 INT=PPP0 NETW=129
DEMAND=ON
SET IPX CIRC=2 RIPCHANGE=YES
SAPCHANGE=YES
3
Repeat this procedure on the Remote Office router,
defining one IPX circuit for the Ethernet interface and one for
the wide area link. Configure the wide area link as a demand
link and enable RIP and SAP change broadcasts, using:
ADD IPX CIRC=1 INT=ETH0 NETW=12
ENCAP=802.3
ADD IPX CIRC=2 INT=PPP0 NETW=129
DEMAND=ON
SET IPX CIRC=2 RIPCHANGE=YES
SAPCHANGE=YES
4
The routers are now configured for IPX dial on demand and
can exchange routes and service information. Save the new
dynamic configuration as a script, by entering the command:
CREATE CONFIG=IPXDOD.SCP
The link will be activated (the ISDN call will be connected)
whenever there is data waiting to be transmitted over the wide
area link, and deactivated when there has been no data
transmitted over the link for a period of time. The link will also
be activated whenever there is a change of route or service
information, to allow the exchange of RIP and SAP updates. To
improve performance, RIP and SAP filters can be configured on
the Head Office router to limit the number and size of
broadcasts which activate the ISDN call.
To configure RIP and SAP filters, follow these steps on the
Head Office router only:
1
Create a RIP filter that only allows information about route
changes to the file server’s internal network (network number
7500) to be included in RIP broadcasts:
ADD IPX RIP=0 NET=7500 ACTION=INCLUDE
2
Create a SAP filter that only allows information about the
file services provided by the file server (named ACCOUNTS)
to be included in SAP broadcasts:
ADD IPX SAP=0 SERVICE=ACCOUNTS TYPE=FILE
ACTION=INCLUDE
3
Associate the RIP and SAP filters with the IPX circuit over
the PPP link:
SET IPX CIRC=2 RIPCHANGE=YES
SAPCHANGE=YES OUTRIP=0 OUTSAP=0
4
Save the new dynamic configuration as a script, by entering
the command:
CREATE CONFIG=IPXFILT.SCP
