Keith Sinclair

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Cisco Configuration Notes

OSPF Notes

  • 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

BGP Notes

  • 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 explicitly:
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