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DES-7200 Configuration Guide Chapter 1 MPLS Configuration
1-24
By default, the LDP uses the liberal label retention mode.
You can run the label-retention-mode command to set the label retention mode.
Command Function
DES-7200(config-mpls-router)#
label-retention-mode {liberal |
conservation}
Set the label retention mode.
DES-7200(config-mpls-router)# no
label-retention-mode
Restore the default label retention mode.
Configuring Label Merging
If an LSR binds several incoming labels for a certain FEC but uses the same outgoing label for
all packets in the FEC, it means that the LSR is capable of label merging. You can enable or
disable label merging through LDP configurations.
By default, label merging is enabled for the LDP.
You can run the command to enable or disable label merging.
Command Function
DES-7200(config-mpls-router)#
label-merge
Enable label merging.
DES-7200(config-mpls-router)# no
label-merge
Disable label merging.
Configuring the Transmission Mode of Label Release Messages
When an FEC becomes invalid, the LDP sends label release messages to downstream devices
to cancel the label bound to the FEC. Each LDP device on the LSR determines whether to
transmit the messages to downstream devices based on the setting on the transmission mode of
label release messages.
By default, an LDP device does not send label release messages received from an upstream
device to downstream devices.
You can run the propagate-release command to set the transmission mode of label release
messages.