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DES-7200 Configuration Guide Chapter 1 MPLS Configuration
1-18
Caution
1. When you specify an IP address as the transport address, make sure that
the address is reachable to other directly connected LSRs; otherwise, the
LDP session cannot be set up.
2. If transport addresses are configured on an interface and globally, the
basic LDP session set up on the interface prefers the transport address
configured for the interface.
3. The configured transport address is valid only for the basic LDP session.
The LDP session set up through extended mechanisms always use the
LSR ID as the transport address.
Configuring the Time Interval for Hello Packets
The LDP periodically sends Hello packets to detect LDP peers. By default, the interval for
sending Hello packets in the basic LDP discovery mechanism is 5s. You can freely set the
interval that ranges from 1 to 65535 seconds in the interface mode.
Command Function
DES-7200(config-if-type ID)# mpls ldp
hello-interval seconds
Set the interval for sending Hello packets in the
basic LDP discovery mechanism.
DES-7200(config-if-type ID)# no mpls
ldp hello–interval
Restore the default interval for sending Hello
packets in the basic LDP discovery mechanism.
The default interval for sending Hello packets in the extended LDP discovery mechanism is 10s.
You can run the discovery target-hello interval command to modify the interval.
Command Function
DES-7200(config-mpls-router)#
discovery target-hello interval
seconds
Set the interval for sending Hello packets in the
extended LDP discovery mechanism.
DES-7200(config-mpls-router)# no
discovery target-hello interval
Restore the default interval for sending Hello
packets in the extended LDP discovery
mechanism.
Configuring the Hold Time of Hello Packets
After an LDP peer is detected by periodically sending Hello packets, the local LDP device retains
the peer for a period of time although no Hello packet is received from the peer, and considers
that the peer expires after this period. This period of time is called the hold time of Hello packets.