Re: OSPF wildcard bits

From: Edmund Roche-Kelly (edr9007@xxxxxxx)
Date: Sat Jun 29 2002 - 20:44:17 GMT-3


   
After (I think) 12.1 , you can't get the order wrong -- IOS will
reorder it:

r5#sho running-config
!
router ospf 1
 network 10.1.0.0 0.0.255.255 area 0
!
r5#conf t
Enter configuration commands, one per line. End with CNTL/Z.
r5(config)#router ospf 1
r5(config-router)#network 10.1.1.0 0.0.0.255 area 10
r5(config-router)#exit
r5(config)#
05:44:24: %OSPF-6-AREACHG: 10.1.1.0/24 changed from area 0 to area 10
r5(config)#
r5#sho running-config
router ospf 1
 network 10.1.1.0 0.0.0.255 area 10
 network 10.1.0.0 0.0.255.255 area 0
!
r5#sho ip ospf int loop 10
Loopback10 is up, line protocol is up
  Internet Address 10.1.1.1/24, Area 10
  Process ID 1, Router ID 10.10.5.1, Network Type LOOPBACK, Cost: 1
  Loopback interface is treated as a stub Host
r5#

It probably doesn't count as best practice though.

Ed

>
> Pls note that the order of the network statements does matter!. For ex. In
> the 2nd method, if you reverse the order of the network statements, ospf
> will not consider 172.16.1.1 under area 0 because 172.16.0.0 matches it and
> you will have problems!.
>
> HTH
>
> Harish



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