01-18-2007 06:42 PM - edited 03-03-2019 03:25 PM
Hi,
I am a bit confused with the prefix list. Say I have "permit 10.16.0.0/14 le 21", what does it mean?
Thanks.
01-19-2007 12:37 AM
(Just discovered netpro today ;)
"permit 10.16.0.0/14 le 21"
Ok, as I see it:
A mask lenght up to 24 bits in routes with the prefix of 10.16.0.0/14 will be accepted.
So this will aply to the 10.16.0.x range in this case
ge = value from = prefix length greater than or equal to the value. (ge is the lowest value of a range).
le = value up to = prefix length less than or equal to the value. (le is the highest value of a range)
eq = Exact value of the length.
So "permit 10.16.0.0/14 qe 19 le 21" will allow for routes with the prefixes from /19 up to /21
For more detail see:
Hope this helps
Johnmar
01-19-2007 08:47 AM
Hi, andrew
The supernet 10.16.0.0/14 has an address range 10.16.0.0 ~ 10.19.255.255, so any routes within this range and has a mask less than or equal to 21 will be permited by this prefix list.
For example:
The supernet 10.16.0.0/15 has a prefix within this range and its mask is less than 21; it is permitted.
and so do 10.18.0.0/15,
and so do 10.16.0.0/16,
and so do 10.17.0.0/16,
...
and so do 10.19.248.0/21
The subnet 10.16.4.0/22 will not be permitted because its mask is too long.
The subnet 10.20.0.0/18 has a shorter mask, but it is out of range; it is denied.
Hope this help
SSLIN
01-19-2007 08:51 AM
10.16.0.0/14 is a subnet, not supernet. sorry for the mistake.
SSLIN
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