3Com S7906E - Switch, Configuration Manual

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If Hello adjacency exists between two peers, no remote adjacency can be established between
them. If remote adjacency exists between two peers, you can configure local adjacency for them.
However, the local adjacency can be established only when the transport address and keepalive
settings of the two peers match respectively, in which case the remote adjacency will be removed.
That is, only one remote session or local session can exist between two LSRs, and the local
session takes precedence over the remote session.
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The remote peer IP address to be configured must be different from all existing remote peer IP
addresses. Otherwise, the configuration fails.
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The IP address specified as the LDP transport address must be the IP address of an interface on
the device.
Configuring the Policy for Triggering LSP Establishment
You can specify the routes that are allowed to trigger the establishment of LSPs:
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All static and IGP routes.
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Static and IGP routes permitted by an IP address prefix list.
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 LDP to establish
LSPs.
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For an LSP to be established, an exactly matching routing entry must exist on the LSR. With
loopback addresses using 32-bit masks, only exactly matching host routing entries can trigger LDP
to establish LSPs.
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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.
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For information about IP address prefix list, refer to
Routing Policy Configuration
in the
IP Routing
Volume
.
Configuring the Label Distribution Control Mode
Follow these steps to configure the LDP label distribution control mode: