H3C Technologies H3C S7500E Series Switches - Manual (Page 60)

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Configuring the Policy for Triggering LSP Establishment
You can configure an LSP triggering policy on an LSR, so that 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.
There are two types of LSP triggering policies:
z
Allowing all routing entries to trigger establishment of LSPs.
z
Filtering routing entries by an IP prefix list, so that static and IGP routes denied by the IP prefix list
will not trigger LSP establishment.
Follow these steps to configure the policy for triggering LSP establishment:
To do… Use the command… Remarks
Enter system view system-view —
Enter MPLS view mpls —
Configure the LSP establishment
triggering policy
lsp-trigger [ vpn-instance
vpn-instance-name ] { all | ip-prefix
prefix-name }
Optional
By default, only local loopback
addresses with 32-bit masks can
trigger establishment of LSPs.
z
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.
z
If the vpn-instance vpn-instance-name combination is specified, the command configures an
LSP establishment triggering policy for the specified VPN instance; otherwise, the command
configures an LSP establishment triggering policy for the public network routes.
z
For information about IP prefix list, see Route Policy Configuration in the Layer 3 - IP Routing
Configuration Guide .
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.
Follow these steps to configure the LDP label distribution control mode:
To do… Use the command… Remarks
Enter system view system-view —
Enter MPLS LDP view mpls ldp —