Configuring The Policy For Triggering Lsp Establishment; Configuring The Label Distribution Control Mode - H3C S5500-HI Series Mpls Configuration Manual

Step
3. Specify the type of the label to
be distributed by the egress to
the penultimate hop.

Configuring the policy for triggering LSP establishment

You can configure an LSP triggering policy on an LSR, so only routes matching the policy can trigger
establishment of LSPs, reducing the number of LSPs to be established on the LSR and avoiding instability
of the LSR caused by excessive LSPs.
An LSR supports the following types of LSP triggering policies:
• Allowing all routing entries to trigger establishment of LSPs.
Filtering routing entries by an IP prefix list, so static and IGP routes denied by the IP prefix list do not
•
trigger LSP establishment. To use this policy, first create the IP prefix list. For information about IP
prefix list configuration, see Layer 3—IP Routing Configuration Guide.
To configure the policy for triggering LSP establishment:
Step
1. Enter system view.
2. Enter MPLS view.
3. Configure the LSP
establishment triggering
policy.
NOTE:
For an LSP to be established, an exactly matching routing entry must exist on the LSR. For example, on an
LSR, to establish an LSP to a loopback address with a 32-bit mask, there must be an exactly matching host
routing entry on the LSR.

Configuring the label distribution control mode

With the label re-advertisement function enabled, an LSR periodically looks for FECs not assigned with
labels, assigns labels to them if any, and advertises the label-FEC bindings. You can set the label
re-advertisement interval as needed.
Command
label advertise { explicit-null |
implicit-null | non-null }
Command
system-view
mpls
lsp-trigger [ vpn-instance
vpn-instance-name ] { all | ip-prefix
prefix-name }
67
Remarks
Optional.
By default, an egress distributes to
the penultimate hop an implicit null
label.
Remarks
N/A
N/A
Optional.
By default, only host routes with
32-bit masks can trigger
establishment of LSPs.
If the vpn-instance
vpn-instance-name option is
specified, the command configures
an LSP establishment triggering
policy for the specified VPN.
Otherwise, the command
configures an LSP establishment
triggering policy for the public
network routes.