Specifications

mpls ldp discovery transport-address
MP-216
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Usage Guidelines The establishment of an LDP session between two routers requires a session TCP connection by which
label advertisements can be exchanged between the routers. To establish the session TCP connection,
each router must know the transport address (IP address) of the other router.
The LDP discovery mechanism provides the means for a router to advertise the transport address for its
e
nd-of-session TCP connection. When the transport address advertisement is explicit, the transport
address appears as part of the contents of discovery hello messages sent to the peer. When the transport
address advertisement is implicit, the transport address is not included in the discovery hello messages,
and the peer uses the source IP address of received hello messages as the peer transport address.
The mpls ldp disco
very transport-address command provides the means to modify the default
behavior described in the Command Default section of this document. When the interface keyword is
specified, LDP advertises the IP address of the interface in LDP discovery hello messages sent from the
interface. When the IP-address argument is specified, LDP advertises the specified IP address in LDP
discovery hello messages sent from the interface.
Note When a router has multiple links connecting it to its peer device, the router must advertise the same
transport address in the LDP discovery hello messages it sends on all such interfaces.
Examples The following example shows how to specify the LDP transport address for interface pos2/0 should be
the interface IP address; it also shows how to specify the IP address 209.165.200.225 of interface pos3/1
should be the LDP transport address:
Router(config#) interface pos2/0
Router(config-if)# mpls ldp discovery transport-address interfac
e
Router(config#) interface pos3/1
Router(config-if)# mpls ldp discovery transport-address 209.165.
200.225
Related Commands Command Description
show mpls ldp
disco
very
Displays the status of the LDP discovery process.
show mpls ldp
neighbor
Displays the status of LDP sessions.