Configuring LDP route injection

Configure LPD route injection to allow the Extreme device to inject routes into LDP by referencing a prefix list and advertise the FEC to the LDP peers. By default, LDP advertises all /32 prefixes that are learned from the loopback interfaces to all other LDP peers.

To configure LDP route injection, perform the following steps:

In privileged EXEC mode, enter global configuration mode.
```
device# configure terminal
```
Configure the prefix list to filter the route.
```
device(config)# ip prefix-list list1 permit 10.2.2.2/32 
```
In this example, a filter is configured to inject route 10.2.2.2/32.
Enter router MPLS configuration mode.
```
device(config)# router mpls
```
Enter LPD configuration mode.
```
device(config-router-mpls)# ldp
```
Enter the advertise-fec command to configure LDP route injection.
```
device(config-router-mpls-ldp)# advertise-fec list1 
 
```
LDP route injection is configured to inject the routes by referencing the list1 prefix list into LDP and advertise the FEC to the LDP peers.
Access privileged EXEC mode.
```
device(config-router-mpls-ldp)# Ctrl-z
```

Verify the LDP route injection configuration.

device# show running-config router mpls ldp
router mpls
 ldp
  ....
  advertise-fec list1
 !
!

Verify that the LDP route injection has been injected into the LDP label information database.

device# show mpls ldp database
Session 10.3.3.3:0 - 10.5.5.2:0
 Downstream label database:
   Label     Prefix           State
 Upstream label database:
   Label     Prefix
   3         10.2.2.2/32

Example

The following configuration is an example of the previous steps.

device(config)# ip prefix-list list1 permit 10.2.2.2/32
device(config)# router mpls
device(config-router-mpls)# ldp
device(config-router-mpls-ldp)# advertise-fec list1