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- OSPF wildcard
- Tim Pope
June 9, 2005, 7:48 am
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For OSPF network commands there are plenty of examples in the Lammle book
and Cisco book for nice, neat subnet masks with all 1's in an octet.
255.255.255.0 for example would yield a wildcard of 0.0.0.255.
But what about the network config for a mask like 255.255.255.240 ? If my
IP address is ..say...220.127.116.11.
Would it be ...network 18.104.22.168 0.0.0.15 area 1
Or... network 22.214.171.124 0.0.0.15 area 1
Or something else?
Also it seems that you could just use wildcard 0.0.0.0 for all you network
commands and only the wildcard notation for summarization right? Would that
work on the exam?
Re: OSPF wildcard
Tim Pope wrote:
If your ip address is 126.96.36.199 and snm is 255.255.255.240, your
network range is
188.8.131.52 through 184.108.40.206 so you would use
network 220.127.116.11 0.0.0.15 area 1
18.104.22.168 is wrong because it is a host address.
22.214.171.124 is wrong because it is a different subnet
The network part of the statement should contain the subnetwork address,
not a host address.
The exam will not allow you to do it any other way.
Re: OSPF wildcard
Router will not change the configuration in this example. The only thing
you're matching here is the interface (which is always /32) and router
will pick up the subnet which is defined on matched interface (in ospf
database), except if that interface is loopback. Then it will pick it as
/32 by default.
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