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MPLS Interface attributes

Mesho7
Beginner
Beginner

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

LDP - I understand that this is LDP protocol enabled

Tunnel - documentation says "State of LSP Tunnel labelling." What is this actually ? RSVP ? TE ?

 

What is the difference between:

LDP labelling enabled & LSP labelling enabled

 

3 Replies 3

balaji.bandi
Hall of Fame
Hall of Fame

What is this actually ? RSVP ? TE ?   - This is more QOS and Trraffic Engineering  - This method determines a path through the network based on the interior gateway protocol's view of the network.

 

LDP  - Ladble distribution protocol which enable when you enable MPLS

LSP - Label Switched Paths - LDP used only best-effort of LSP

 

You can find an more information here :

 

https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/convert/mp_ldp_book/mp_ldp_overview.html

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Mesho7
Beginner
Beginner

I still don't get the difference between:

LDP - State of LDP labelling.

Tunnel - State of LSP Tunnel labelling.

 

  Interface POS0/4/0/0:         

     LDP labelling enabled

     LSP labelling enabled (TE-Control)

     MPLS enabled

     MTU = 4474

pigallo
Cisco Employee
Cisco Employee

 

 

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.


 

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