H3C Technologies H3C S12500-X Series Switches - Manual (Page 37)

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Figure 14 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. H3C recommends that you 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.
• Enter LDP view:
mpls ldp
• Enter LDP-VPN instance view:
a. mpls ldp
b. vpn-instance vpn-instance-name
N/A
3. Configure a label
advertisement policy.
advertise-label prefix-list prefix-list-name
[ peer peer-prefix-list-name ]
By default, LDP advertises all
label mappings permitted by the
LSP generation policy to all peers.
Configuring a label acceptance policy
A label acceptance policy uses an IP prefix list to control the label mappings received from a peer.
As shown in
Figure 15 , LSR A uses an IP prefix list to filter label mappings from LSR B, and it does not filter
label mappings from LSR C.