> For the complete documentation index, see [llms.txt](https://jncia-workbook.gitbook.io/workbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jncia-workbook.gitbook.io/workbook/junos-routing-policy/9-selective-redistribution-part-3.md).
# 9) Selective Redistribution (Part 3)
### Pre-Work
Load the config called **policy.cfg** using the **load\_config\_on\_nodes.py** script.
```
python3 load_config_on_nodes.py --lab_dir three-routers --config_filename policy.cfg
```
### Lab
All routing (static routes, OSPFv2, and BGP) is already setup.
Configure R1 to redistribute all static routes into OSPF. Use a route policy that only permits prefixes 10.0.0.0/16 and 10.0.1.0/24. **This time, use a method that does not define the route-filter within the policy.**
### Answer
Expand to reveal
```
set policy-options prefix-list STATIC_TO_OSPF 10.0.0.0/16
set policy-options prefix-list STATIC_TO_OSPF 10.0.1.0/24
edit policy-options policy-statement STATIC_TO_OSPF
set from protocol static
set from prefix-list STATIC_TO_OSPF
set then accept
top
set protocols ospf export STATIC_TO_OSPF
```
### Explanation
Expand to reveal
Besides using an inline `route-filter`, we can also use a `prefix-list`. The prefix-list is defined under `routing-options`, outside of the route-filter. The prefix-list can be reused among multiple route policies, as well as firewall filters. The benefit is that when you need to update the prefix-list, you only have to do it in one place. With inline route-filters, you may have to update multiple policies.
```
set policy-options prefix-list STATIC_TO_OSPF 10.0.0.0/16
set policy-options prefix-list STATIC_TO_OSPF 10.0.1.0/24
```
\
Notice that we cannot define any mask range in the prefix-list, like you may be used to in IOS:
```
[edit]
admin@R1# set policy-options prefix-list STATIC_TO_OSPF 10.0.0.0/16 ?
Possible completions:
<[Enter]> Execute this command
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
| Pipe through a command
[edit]
admin@R1# set policy-options prefix-list STATIC_TO_OSPF 10.0.0.0/16
```
\
In Junos, the prefix-list simply contains a list of prefixes, not mask ranges. When applying the prefix-list to the route policy, we are essentially only matching exact masks.
```
set policy-options policy-statement STATIC_TO_OSPF from prefix-list STATIC_TO_OSPF
```
\
There is another way to match ranges with prefix-lists, which we will see in the next lab.
\
We should see that R1 is only redistributing these two prefixes:
```
admin@R1> show ospf database external
OSPF AS SCOPE link state database
Type ID Adv Rtr Seq Age Opt Cksum Len
Extern *10.0.0.0 10.0.0.1 0x80000001 2 0x22 0x1e7f 36
Extern *10.0.1.0 10.0.0.1 0x80000001 2 0x22 0x1389 36
```
### Further Reading