Hello, answers inline.
@Mesho7 wrote:
I have a question about MPLS Interface attributes.
In the examples I see:
Interface LDP Tunnel Enabled
-------------------------- -------- -------- --------
POS0/4/0/0 Yes Yes Yes
Interface - which I assume is Ethernet interface
No POS actually is Packet over Sonet/SDH , so it doesn't run any ethernet encapsulation. It rather runs PPP usually...
LDP - I understand that this is LDP protocol enabled
yes, LDP indicates if LDP protocol is enabled for that interface.
Tunnel - documentation says "State of LSP Tunnel labelling." What is this actually ? RSVP ? TE ?
it indicates the capacity of traffic engineering on the interface (see link below for confirmation).
What is the difference between:
LDP labelling enabled & LSP labelling enabled
https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/12492-mpls-tsh.html#mpls
LSP labelling is the result of the reservation process performed via RSVP protocol. Without RSVP, it would not be possible to signal the LSP across the core and verify requested LSP attributes hop by hop.
LDP labeling is enabled when you activate basic mpls ldp neighborship among nodes, so LDP bindings are built and labels distributed. You don't need LDP on top of MPLS TE tunnels because RSVP is responsible to carry labels within RESV messages.
Hope i was able to clarify the point.
Regards.
