Specifications

mpls ldp neighbor implicit-withdraw
MP-244
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Usage Guidelines By default, in Cisco IOS Release 12.0(21)ST and later, LDP withdraws the previously advertised label
by using a withdraw message before advertising a new label for a FEC. In Cisco IOS releases prior to
12.
0(21)ST, LDP did not withdraw a previously advertised label before advertising a new label for a
FEC. In those older releases, the new label advertisement served as an implied withdraw and LDP did
not send a withdraw message. To cause LDP now to operate as it did in releases before Cisco IOS release
12.
0(21)ST—that is, to make LDP now advertise a new label for a FEC without first withdrawing the
previously advertised label—use this command’s implicit-withdraw keyword.
Router(config)# mpls ldp neighbor 10.10.10.10 implicit-withdraw
Using the implicit-withdraw keyword avoids generating the overhead from an exchange of label
withdraw and label release messages.
To disable the implic
it-withdraw option, use the no form of the command with the implicit-withdraw
keyword. This returns the router to the default, which requires that LDP withdraw the previously
advertised label for a FEC before advertising a new label.
Router(config)# no mpls ldp neighbor 10.10.10.10 implicit-withdraw
Examples In the following example, LDP does not send a label-withdraw message to the neighbor whose router ID
is 10.10.10.10 when a need exists to change the previously advertised label for a FEC:
Router(config)# mpls ldp neighbor 10.10.10.10 implicit-withdraw
Related Commands Command Description
mpls ldp neighbor
pa
ssword
Configures a password key for computing MD5 checksums for the session
TCP connection with the specified neighbor.
mpls ldp neighbor
ta
rgeted
Sets up a targeted session with the specified neighbor.