I have a question please about MPLS RSVP-TE & LDP inside Cisco routers. I read in an IEEE article "Designing Multiprotocol Label Switching Networks" by Jeremy Lawrence, from Cisco. There is a footnote:
"It is, in principle, possible to run an MPLS network using the Resource
Reservation Protocl plus extensions, but without the use of the Label
Distribution Protocol. However, it is not clear whether any MPLS
implementation supports this."
From which I deduce that Cisco requires LDP to always exist with RSVP-TE inside Cisco MPLS routers. Is this true?, and if yes can you tell me please why RSVP-TE should be tied with LDP? Is this to enhance the network bandwidth usage or what?
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