Configure a Prefix List
Configure a prefix list to allow or deny specific route updates. A prefix list policy specifies route prefixes to match. After a match occurs, the system uses the route.
The prefix list contains a set of contiguous or non-contiguous routes. Reference prefix lists by name from within a routing policy.
Before you begin
To perform this procedure on a non-default VRF, you must first change the VRF instance. For information about how to use EDM for a non-default VRF, see Select and Launch a VRF Context View. All parameters might not be available in non-default VRFs.
Procedure
- In the navigation pane, expand .
- Select Policy.
- Select the Prefix List tab.
- Select Insert.
- For Id, type an ID for the prefix list.
- For Prefix, type an IP address for the route.
- For PrefixMaskLength, type the length of the prefix mask.
- Configure the remaining parameters as required.
- Select Insert.
Prefix List field descriptions
Use the data in the following table to use the Prefix List tab.
|
Name |
Description |
|---|---|
|
Id |
Configures the list identifier. |
|
Prefix |
Configures the IP address of the route. |
|
PrefixMaskLen |
Configures the specified length of the prefix mask. You must enter the full 32-bit mask to exact a full match of a specific IP address, for example, if you create a policy to match on the next hop. |
|
Name |
Names a specified prefix list during the creation process or renames the specified prefix list. The name length can use from 1 to 64 characters. |
|
MaskLenFrom |
Configures the lower bound of the mask length. The default is the mask length. Lower bound and higher bound mask lengths together can define a range of networks. |
|
MaskLenUpto |
Configures the higher bound mask length. The default is the mask length. Lower bound and higher bound mask lengths together can define a range of networks. |