Can anybody tell me whtats the use of Wildcard Mask while configuring OSPF on router.....Pls Help?

Question

Can anybody tell me whtats the use of Wildcard Mask while configuring OSPF on router.....Pls Help?

Answer 1

matches any IP address, for example 255 matches, 0 means 'dont care bits':

192.168.1.1 255.255.255.255 - will match all 4 sets of octets.

192.168.1.1 255.255.255.0 - will match first 3 octets, last can be anything.

192.168.1.1 255.255.0.0 - will match first 2 octets, last two can be anything..

Get it? :)

Answer 2

The wildcard tell OSPF which interfaces of the router are in a particular OSPF area

Answer 3

Payne has it almost right - he did a subnet mask - which is the same thing as a wildcard mask - except inverted.

255 means "don't care" and 0 means "care" in between 0 and 255 - ie 128 - means care about part of the ranges.

So a wildcard mask of: 10.0.0.0 0.255.255.255 means that the router should route the network of 10.anything

A network and  mask of 10.10.0.0 0.0.255.255 means route the 10.10.anything network.

Answer 4

It's used to specify the range of IP addresses to be associated with the routing process