02-13-2018 10:13 PM - edited 03-08-2019 01:50 PM
I just red the below question and its answer. Please explain some one about that. also explain what is 0.0.0.0 and 255.255.255.255
which single network command will start ospf on all interfaces of a router ?
answer : netwrok 0.0.0.0 255.255.255.255
02-13-2018 11:04 PM
Hi
network 0.0.0.0 255.255.255.255 command will enable OSPF in all interfaces.
You can understand this wild card representation as all interfaces.
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02-13-2018 11:10 PM
02-13-2018 11:13 PM
This means all bits set on the network side will be allowed.
Let say, if you use 0.255.255.255 then you are saying the first octect can't be changed.
This is wild card mask concept.
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02-13-2018 11:19 PM
02-13-2018 11:30 PM
Then Passive command will overwrite the default command. Setting an interface as passive disables the sending of routing updates on that interface, hence adjacencies will not be formed in OSPF. However, the particular subnet will continue to be advertised to other interfaces.
Regards,
Deepak Kumar
02-13-2018 11:38 PM
The proper way to do this is configure "passive interface default" which will enable passive interface in all interface.
This command is enabled globally and you need to apply once.
Then, you can pick up the interface you want and issue the command "no passive interface"
This is the easier and secure way to manage router with multiples interfaces.
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02-13-2018 11:53 PM
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