Route Filtering with prefix list.

cms819cms819 Member Posts: 26 ■□□□□□□□□□
I am a little confused with this topic.

If you're matching a le 22

does this mean any network address in between those subnetmaks??

so any network address range from the/16 through /22 will be matched?
example from the /22 network address,, etc will be matched?
example from the /17 network, will be matched?


  • fredrikjjfredrikjj Member Posts: 879
    Yes. The first 16 bits of the prefix must be 10.0 and the mask must be 16,17,18,19,21 or 22.
  • networker050184networker050184 Mod Posts: 11,962 Mod
    The first 16 bits must match. So anything with 10.0 in the first two octets. Now you say the length must be less than or equal to /22.

    So let's take for example. The first 16 bits match good to go. No is it less than or equal to /22? Yep! It's a match. Nope first 16 bits don't match. Nope, first 16 buts match but prefix length is not less than or equal to /22.
    An expert is a man who has made all the mistakes which can be made.
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