Routing

Hi,

Before I use route-filter for reject small ranges.

route-filter 0.0.0.0/0 prefix-length-range /25-/32

then reject

But now, I need to accept /24 and bigger prefixes. How do I do it?

route-filter 0.0.0.0/0 prefix-length-range /0-/24 

then accept

?

Hi,

Similar construct but you can use

route-filter 0/0 upto /24

See this suport page for several exmaples.

Tim

I think you are looking for the "or longer" qualifier where you accept the /24 /25 up through /32 prefixes

route filter 0.0.0.0/24 or longer

It's not correct and not working well. Some /24 didn't came with it.

route-filter 0/0 upto /24 is correct way to do it.

Hi,

My policy for BGP sanity on the border routers is like this:

[edit policy-options]
  policy-statement bgp_sanity {
        term no_shorts {
            from {
                route-filter 0.0.0.0/0 prefix-length-range /25-/32;
            }
            then reject;
        }
        term rfc1918 {
            from {
                prefix-list-filter rfc1918 orlonger;
            }
            then reject;
        }
    }

    prefix-list rfc1918 {
        10.0.0.0/8;
        172.16.0.0/12;
        192.168.0.0/16;
    }

I apply it as import policy on BGP neighbours as first policy, if there are more.