Policy Framework Configuration Guide - Juniper Networks

Chapter 5: Extended Match Conditions Configuration
Example: Rejecting Routes with Specific Destination Prefixes and Mask Lengths
Reject routes with a destination prefix of 0.0.0.0 and a mask length from 0 through 8,
and accept all other routes:
[edit]
policy-options {
policy-statement policy-statement from-hall2 {
term 1 {
from {
route-filter 0.0.0.0/0 upto /8 reject;
}
}
then accept;
}
}
Example: Rejecting Routes with a Mask Length Greater than Eight
Reject routes with a mask of /8 and greater (that is, /8, /9, /10, and so on) that have the
first 8 bits set to 0 and accept routes less than 8 bits in length:
[edit]
policy-options {
policy-statement from-hall3 {
term term1 {
from {
route-filter 0/0 upto /7 accept;
route-filter 0/8 orlonger;
}
then reject;
}
}
}
Example: Rejecting Routes with Mask Length Between 26 and 29
Reject routes with the destination prefix of 192.168.10/24 and a mask between /26 and
/29 and accept all other routes:
[edit]
policy-options {
policy-statement from-customer-a {
term term1 {
from {
route-filter 192.168.10/24 prefix-length-range /26–/29 reject;
route-filter 0/0;
}
then accept;
}
}
}
Example: Rejecting Routes from Specific Hosts
Reject a range of routes from specific hosts, and accept all other routes:
[edit]
Copyright © 2010, Juniper Networks, Inc.
125