MPLS Concepts Label Control and Management
Label distribution
- Ordered LSP control
- LSR only binds and advertises a label for a particular FEC if:
- it is the egress LSR for that FEC or
- it has already received a label binding from its next-hop
- Independent LSP control
- LSR binds a label to a FEC independently from the label it has to receive from its next-hop
- an LSR may forward a labelled packet to a next-hop that does not have yet label information for that FEC