OSPF wildcard

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.

But what about the network config for a mask like 255.255.255.240 ? If my IP address is ..say...170.50.10.17.

Would it be ...network 170.50.10.0 0.0.0.15 area 1

Or... network 170.50.10.17 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?

Tim

This works also: network 170.50.10.17 0.0.0.0 area 1

"Bill" kirjoitti viestissä news: snipped-for-privacy@comcast.com...

I would say

network 170.50.10.16 0.0.0.15 area 1

because, as the sunben mask is 255.255.255.240, this IP .17 belongs to

if the ip was 10.50.10.82 255.255.255.240

network 170.50.10.80 0.0.0.15 area 1

Tayfun

Yep if you want to only match host 170.50.10.17. If you need to match

Cas..

Actually it works. It adds the network to ospf, not the host. It looks the right mask from the interface.

"Cas" kirjoitti viestissä:42ad5a5a$0$80895$ snipped-for-privacy@news.xsall.nl...

It's by design. The network statement indicates which interfaces will participate in the OSPF processs. Since you can have only one interface in a particular subnet on a router, you can specify either the interface or the subnet.

Doan

Strange... Is that by design, or a coincidental side effect ?

Just curious...

Cas...

Yeah, it will.

The router will change it to the correct subnet.

Jonathan

By design.

The router realizes what you are trying to do and does it.

Jonathan

Clear ! Thanks...

Cas.

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.