LDP has more features such as abort, MD5 authentication, notification, backoff logic etc.
TDP is the default on Cisco routers
LDP is the default with this global config -
mpls ldp protocol ldp
LDP/TDP operates in three steps -
Once labels are exchanged, LIB is built
LIB and FIB together helps to build LFIB
TDP Neighbors are discovered via TDP Hellos (like most of the routing protocols)
TDP Hellos are sent to 255.255.255.255
TDP hellos are sent to UDP port = 711
TDP hellos are sent only after mpls ip is configured on an interface
LDP Neighbors are discovered via LDP Hellos (like most of the routing protocols)
LDP Hellos are sent to 220.127.116.11
LDP hellos are sent to UDP port = 646
LDP hellos are sent only after both mpls ip and mpls label protocol ldp are configured on an interface ** unless you have the global command in.
and yes ldp and tdp can coexist but you cannot mix them on an interface i.e. R1 s1/0 connects to R2 s2/0. In this scenario you MUST have either LDP or TDP on each interface, otherwise they will not for a neighbourship.
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