Routing

This is one scenario that I have been struggling with and it appears to come up often.

Essentially, I want to take all the routes that have a certain prefix length, eg. /32 and then reject or accept them. There seems to be no way using a route-filter to do this.

Just to illustrate, suppose I have following three routes :-

1.1.1.1/32

2.2.2.2/32

3.3.3.3/32

I want to take the same action, reject or accept on all three of them but using a single "from" statement. Is this doable within the framework of Junos?

Thanks in advance,

Nic

create a prefix list and add each of the /32 that you want reject; then in your policy statement, say from prefix-list <name> then reject

That is assuming that is what you want to do. In the then action you can use reject or accept

[edit policy-options]

prefix-list block-them-32 {
1.1.1.1/32;
2.2.2.2/32;
10.10.10.10/32;
12.12.12.12/32;
}
policy-statement accept-them-thirty-two {
from {
prefix-list block-them-32;
}
then accept;
}
policy-statement block-them-thirty-two {
from {
prefix-list block-them-32;
}
then reject;
}

 And you can always modify the prefix list as you wish. You can also use it in firewall filters if you want to also.

That looks good for the given scenario.

Sorry about this but I have to change the scenario a bit to make my predicament clearer.

Suppose you wanted to take care of all future /32 routes that will be added as well. Can it be done with a, say future-proof, policy? Suppose I do not want to alter the prefix-list every single time a /32 is added to the network.

Thanks,

Nic

Try this:

from route-filter 0.0.0.0/0 prefix-length-range /32-/32;

___________________________________
Accept as Solution = cool !
Accept as Solution+Kudo = You are a Star !

/paraphrasing master alex

That is it. It works. Thank you so much.

Kudos,

Nic