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New Member

OSPF area range command

Hi all!

Im reading the book "OSPF Network Design Solutions"

and in chapter with ABR\ASBR routers configurations there are some examples of area range command:

Screenshot.png

im confused with area mismatch in network command (area 0), and area range command (area 1) for same networks (130.10.2.0/24 and 130.10.3.0/24). isthis a mistake or Im something don't understand? 

  • LAN Switching and Routing
1 ACCEPTED SOLUTION

Accepted Solutions

OSPF area range command

Hi Maxim,

there is not only one answer. Depending from the design and from the interface configuration you can see more options..

one more for example could be that the author used 130.10.1.0/24 in area 1 and this would be a summarisation of few smaller subnets (/27 for example) present in area 1. Hence the mistake could be in the area range command on the mask that had to be:

area 1 range 130.10.1.0 255.255.255.0

Alain's one could be one option more but generally you should understand the design to understand whether that is a misake or not. We have not enough data to tell you where precisely the error lies (if any in place)

Take Care

Alessio

3 REPLIES
Purple

OSPF area range command

Hi,

yes indeed the area range command should have the 0 instead of 1 as the components subnets are in area 0.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

OSPF area range command

Hi Maxim,

there is not only one answer. Depending from the design and from the interface configuration you can see more options..

one more for example could be that the author used 130.10.1.0/24 in area 1 and this would be a summarisation of few smaller subnets (/27 for example) present in area 1. Hence the mistake could be in the area range command on the mask that had to be:

area 1 range 130.10.1.0 255.255.255.0

Alain's one could be one option more but generally you should understand the design to understand whether that is a misake or not. We have not enough data to tell you where precisely the error lies (if any in place)

Take Care

Alessio

New Member

OSPF area range command

Thanks all

There is no topology for this example, so I think its not best address allocation if there is no mistake

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