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RFC 3031, "Multiprotocol Label Switching Architecture", January 2001

Source of RFC: mpls (rtg)

Errata ID: 2992
Status: Held for Document Update
Type: Editorial

Reported By: Bala Venkata
Date Reported: 2011-10-12
Held for Document Update by: Adrian Farrel

Section 3.12 says:

If the FTN maps a particular label to a set of NHLFEs that contains
more than one element, exactly one element of the set must be chosen
before the packet is forwarded. The procedures for choosing an
element from the set are beyond the scope of this document. Having
the FTN map a label to a set containing more than one NHLFE may be
useful if, e.g., it is desired to do load balancing over multiple
equal-cost paths.

It should say:

If the FTN maps a particular FEC to a set of NHLFEs that contains
more than one element, exactly one element of the set must be chosen
before the packet is forwarded. The procedures for choosing an
element from the set are beyond the scope of this document. Having
the FTN map a FEC to a set containing more than one NHLFE may be
useful if, e.g., it is desired to do load balancing over multiple
equal-cost paths.

Notes:

Since FTN is used for packets that arrive unlabeled (as ILM is used for label-NHLFEs), this section should be corrected. It says that "FTN maps a particular label to a set of NHLFEs"

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