Re: prefix-list 128.0.0.0/2 ge 17 not matching net 192.1.1.0/24

Hello,

As per my knowledge,

/x:x is the number of bits to look at.
ge/le: denote the range of Subnet Masks/Prefixes to use.

128.0.0.0/2 : means only the 2 first digits are the ones we care about and
they should be 10.
10 000000.00000000.00000000.00000000
which will put a range from 10 000000- 10 111111-->128-191.

As for the greater sign it means for all Subnet Masks greater than 17.
Thus the subnets are:

128.0.0.0/18-->191.0.0.0/18 &
129.0.0.0/19-->191.0.0.0/19 &

With all Subnet masks increasing one by one..etc

Regards,

On Sun, Apr 25, 2010 at 3:49 PM, Ladee Geek <ladeegeek_at_gmail.com> wrote:

> for the life of me I cannot determine why the prefix noted above is not
> matching the prefix 192.1.1.0/24.
>
>
> The topology is r3 and r5 as eBGP peers. R5 originating 128, 191, and 192
> routes. R5 with the prefix permit 128.0.0.0/2 ge17 attached to the R3
> neighbor statement. That prefix statement is not permitting the 192 route.
>
>
>
> R3 before the prefix-list
>
>
>
> Network Next Hop Metric LocPrf Weight Path
>
> *> 128.1.1.0/24 10.1.35.5 0 0 35 i
>
> *> 191.1.1.0/24 10.1.35.5 0 0 35 i
>
> *> 192.1.1.0 10.1.35.5 0 0 35 i
>
>
>
> R3 after the prefix-list
>
>
>
> Network Next Hop Metric LocPrf Weight Path
>
> *> 128.1.1.0/24 10.1.35.5 0 0 35 i
>
> *> 191.1.1.0/24 10.1.35.5 0 0 35 i
>
>
>
>
>
> R5 Loopbacks
>
>
>
> Loopback128 128.1.1.5/24
>
> Loopback191 191.1.1.5 /24
>
> Loopback192 192.1.1.5/24
>
>
> --
> r/
> LG
>
>
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-- 
KJ
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