ASA OSPF Advertisement

Hi,

I am wondering what is the difference between "not-advertise" and  "filter-list".

What is the best way to restrict specific route of being advertised into outside interface.

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area 1 range x.x.x.x 255.255.255.255 not-advertise

------------

area 1 filter-list prefix FILTEROUT out

prefix-list FILTEROUT seq 5 deny x.x.x.x/32

Comments

  • Hello,

    Both accomplish the same thing, the area 1 range command with the not-advertise option is actually the "old" way of doing it. Whereas the filter-list is the new way as it gives you more control on which routes you want to filter, etc.

    Anyhow, specially for the lab, it is always good to know how to do things in different ways.

    HTH

    Good luck!

  • Thanks,

    I have tested it. I think we should consider the direction of the filter IN or OUT as well as the area we applying the filter area o or 1.

    WM

     

  • I disagree; with area range you can't filter a /32, cause you make a summary of some routes; also area range creates by default a null0 route; so area range and the filter are two different functions although may have some common results.
    Regards,
    Cristian.

    Sent from my iPhone

    On May 9, 2013, at 20:02, waleed1974 <[email protected]> wrote:

    Thanks,

    I have tested it. I think we should consider the direction of the filter IN or OUT as well as the area we applying the filter area o or 1.

    WM

     




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