MPLS Label assignment



  • Hi guys,

    I am new to MPLS and i am wondering if someone can help me understand label assignment in MPLS.

    I understand that label can be assigned manually (Static LSP) and automatically (LDP signalling protocol). During manual LSP setup we define label value manually on each LSR.

    Ingress LSR - Push (Label value)
    Transit - Incoming Label & outgoing label (Pop/Swap label value)

    Question

    Does LSR assign every LSP a different label or same label? I think it should be different Label….but if it uses different label for every LSP then how does a transit router know which LSR its coming from? or Transit router doesnt care where does it come from since LSPs are uni-directional??

    I hope this question make sense 🙂

    Thanks


 

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