Ubigate iBG2016 Configuration Guide/Ed.00
© SAMSUNG Electronics Co., Ltd.
147
MPLS Forwarding
MPLS forwarding consists of 3 main operations:
1.
Mapping of data packets into LSPs based on destination FEC bypushing
MPLS labels. For Martini case, a VC label followed by a tunnel label
will be pushed.
2.
Switching of MPLS labeled packets by swapping the incoming MPLS
labels with pre-agreed outgoing label.
3.
Forwarding of MPLS packet as L3 packets by popping the MPLS label
at the PHP HOP or at the egress LER. For Martini case, forwarding of
MPLS packet as L2 packets by popping the MPLS outer label, and
examine the inner VC label.
The MPLS architecture defines the components of the forwarding
information base(FIB) as follows:
y
Next Hop Label Forwarding Entry(NHLFE): An entry containing next-
hop information(interface and next-hop address) and label
manipulation instructions; it may also include label encoding, L2
encapsulation information, and other information required for
processing packets in the associated stream.
y
Incoming Label Map(ILM): A mapping from incoming labels to
corresponding NHLFEs.
y
FEC-to-NHLFE map(FTN): A mapping from the FEC of any incoming
packets to corresponding NHLFEs.
y
Existing FIB design must be enhanced to support the FTN and ILM
table for MPLS packet forwarding.
Содержание Ubigate iBG2016
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