Configuring a label advertisement policy
A label advertisement policy uses IP prefix lists to control the FEC-label mappings advertised to peers.
As shown in Figure 16, LSR A advertises label mappings for FECs permitted by IP prefix list B to LSR B. It advertises label mappings for FECs permitted by IP prefix list C to LSR C.
Figure 16: Label advertisement control diagram
A label advertisement policy on an LSR and a label acceptance policy on its upstream LSR can achieve the same purpose. As a best practice, use label advertisement policies to reduce network load if downstream LSRs support label advertisement control.
Before you configure an LDP label advertisement policy, create an IP prefix list. For information about IP prefix list configuration, see Layer 3—IP Routing Configuration Guide.
To configure a label advertisement policy:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter LDP view or enter LDP-VPN instance view. |
| N/A |
3. Configure an IPv4 label advertisement policy. | advertise-label prefix-list prefix-list-name [ peer peer-prefix-list-name ] | By default, LDP advertises all IPv4 FEC-label mappings permitted by the LSP generation policy to all peers. |