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Community Member

MPLS Tables

can anybody tell me what is meant by the following terms

       NextHopLabel ForwardingEntry (NHLFE)

       IncomingLabelMap(ILM)

       FEC–To-NHLFEMap(FTN)

       Label Information Base(LIB)

       Label Forwarding Information Base(LFIB)

also, what is the difference between each?

Thanks in Advance

2 REPLIES
Silver

MPLS Tables

Hello,

The LIB  represents the control plane information for a LSR: Label Switch Router. A label exchange protocol binds labels to routes in the RIB (routing table) and it also exchange the label bindings with other neighbors LSR's. The LIB is the place where the LSR's store the local and received labels. Label exchange protocols are LDP, TDP, MP-BGP and RSVP. Also, the structure of the LIB is Prefix, LSR/Local, Label.

The LFIB represents the data plane for a LSR. It is build from the CEF table + LIB. The LFIB stores the labels used to forward packets, unlike the LIB table that stores all the label bindings. The structure is Inlabel, Outlabel, Next-Hop.

Regarding the other terms, where have you seen this terminology? I suppose that are:

NextHopLabel ForwardingEntry (NHLFE): the next hop LSR.

IncomingLabelMap(ILM): The label received from a LSR, from the Label Mapping message received.

FEC–To-NHLFEMap(FTN): the next hop LSR for a FEC.

Hope this helps,

Jose.

Community Member

MPLS Tables

Thank you for ur reply

I have seen those terminology in RFC 3031 - MPLS Architecture

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