When configuring OSPF and the ip address which is being used as the router id is deleted the router must be reloaded or OSPF deconfigured and reconfigured.

sh ip ospf - display ospf information including router id

sh ip ospf interfaces - display which interfaces are talking OSPF.

use ip ospf network point... interface command for Frame and X25 in a NBMA configuration.

use ip ospf priority to modify the Designated Router

use the "subnets" modifier when redistributing from anything into OSPF

use the summary router configuration command to summarise redistributed routes from OSPF into IGRP and others.

when redistributing into BGP to another AS with the same class address remove auto-summarisation.

When redistributing OSPF into BGP with external type 1 and type 2 explictly. as in the following command.

redistribute ospf 100 metric 50 match internal external 1 external 2

IPX Stuff

IPX dial on demand would stay up all the time with RIP and SAPS the following is an access-list which blocks IPX RIPS and SAPS but allows an IPX ping to bring up the service.

access-list 900 deny sap any sap <NETWORK>.ffff.ffff.ffff
access-list 900 deny rip any rip <NETWORK>.ffff.ffff.ffff
access-list 900 permit any

dialer-list 1 protocol ipx list 900

Dial on Demand ISDN Encapsulation X25

Router A

interface BRI0
 ip address 192.168.254.1 255.255.255.0
 no ip mroute-cache
 encapsulation x25 dce ietf
 x25 address 1111
 x25 map ip 192.168.254.2 2222 broadcast method ietf
 isdn answer1 96635137
 dialer idle-timeout 60
 dialer map ip 192.168.254.2 broadcast 99170870
 dialer-group 1
!

dialer-list 1 protocol ip permit

Router B

interface BRI0
 ip address 192.168.254.2 255.255.255.0
 no ip mroute-cache
 encapsulation x25 ietf
 ipx network 1111
 x25 address 2222
 x25 map ip 192.168.254.1 1111 broadcast method ietf
 dialer map ip 192.168.254.1 broadcast 299170870
 dialer-group 1
!

dialer-list 1 protocol ip permit