You would like two LDP routers on opposite sides of your network to become neighbors. Which LDP message is used to form this relationship?
A.
basic discovery
B.
extended discovery
C.
peer discovery
D.
remote discovery
Which LDP message is used to form this relationship?
You would like two LDP routers on opposite sides of your network to become neighbors. Which LDP message is used to form this relationship?
A. Basic discovery—A router periodically sends LDP link hello messages through an interface. LDP link hello messages are sent as UDP packets addressed to the LDP discovery port. Receipt of an LDP link hello message on an interface identifies an adjacency with the LDP peer router.
Chinorv,
The question is referring to routers on opposite sides of the network. Basic is for directly connected (Physical Cable) LDP neighbors where Extended uses IGP (OSPF/ISIS) to establish a neighbor.
LDP uses the following discovery procedures:
Basic discovery—A router periodically sends LDP link hello messages through an interface. LDP link hello messages are sent as UDP packets addressed to the LDP discovery port. Receipt of an LDP link hello message on an interface identifies an adjacency with the LDP peer router.
Extended discovery—LDP sessions between routers (not directly connected) are supported by LDP extended discovery. A router periodically sends LDP targeted hello messages to a specific address. Targeted hello messages are sent as UDP packets addressed to the LDP discovery port at the specific address. The targeted router decides whether to respond to or ignore the targeted hello message. A targeted router that chooses to respond does so by periodically sending targeted hello messages to the initiating router.