advertise-label
Use advertise-label to configure a label advertisement policy.
Use undo advertise-label to delete a label advertisement policy.
Syntax
advertise-label prefix-list prefix-list-name [ peer peer-prefix-list-name ]
undo advertise-label prefix-list prefix-list-name
Default
No label advertisement policy is configured. The device advertises IPv4 FEC-label mappings permitted by the LSP generation policy to all peers.
Views
LDP view
LDP-VPN instance view
Predefined user roles
network-admin
Parameters
prefix-list prefix-list-name: Specifies an IPv4 prefix list by its name, a case-sensitive string of 1 to 63 characters. This prefix list filters advertised label mappings.
peer peer-prefix-list-name: Specifies an IPv4 prefix list by its name, a case-sensitive string of 1 to 63 characters. This prefix list filters LDP peers. If you do not specify this option, the device advertises label mappings to all peers.
Usage guidelines
Use a label advertisement policy to filter label mappings advertised to peers.
Configure multiple label advertisement policies by executing this command multiple times.
If a label mapping is permitted by an advertisement policy, LDP advertises the mapping by following these rules:
If the policy has no peer IPv4 prefix list (peer peer-prefix-list-name not specified), LDP advertises the label mapping to all peers.
If the policy has a peer IPv4 prefix list, LDP advertises the label mapping to the peers permitted by the peer IPv4 prefix list.
If a label mapping is permitted by multiple advertisement policies, LDP advertises the label mapping according to the first configured policy.
Using a label advertisement policy on an LSR or using a label acceptance policy on its upstream LSR can achieve the same purpose. As a best practice, use the label advertisement policy to reduce network load.
Examples
# Configure two label advertisement policies. One policy advertises only the label mapping for subnet 10.1.1.0/24 to peer 3.3.3.9. The other policy advertises only the label mapping for subnet 10.2.1.0/24 to peer 4.4.4.9.
<Sysname> system-view [Sysname] ip prefix-list prefix-to-C permit 10.1.1.0 24 [Sysname] ip prefix-list prefix-to-D permit 10.2.1.0 24 [Sysname] ip prefix-list peer-C permit 3.3.3.9 32 [Sysname] ip prefix-list peer-D permit 4.4.4.9 32 [Sysname] mpls ldp [Sysname-ldp] advertise-label prefix-list prefix-to-C peer peer-C [Sysname-ldp] advertise-label prefix-list prefix-to-D peer peer-D
Related commands
display mpls ldp fec
ip prefix-list (Layer 3—IP Routing Command Reference)
lsp-trigger