Label Control Mode; Label Holding Mode; Figure 13 Downstream On Demand - Zte ZXR10 8900 Series User Manual

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Label Control Mode

There are two label control modes:
� Independent
Each LSR can notify label mapping messages to neighbor LSR
at any time.
� Ordered
Only when a LSR receives specific label mapping messages of
a particular FEC, or when the LSR is the egress, the LSR sends
label mapping messages to upstream LSR.

Label Holding Mode

Label holding mode means the mode to process label bindings that
a LSR received but currently not in use. There are two label holding
modes: liberal and conservative.
Suppose there are two LSRs named LSR1 and LSR2, and LSR2
is not the next hop of LSR1. For a particular FEC, when LSR1
receives label binding from LSR2, if LSR1 saves this binding, this
means that LSR1 uses liberal label holding mode. If LSR1 discards
the binding, this means that LSR1 uses conservative label holding
mode.
In liberal label holding mode, a LSR can adapt itself to route
changes quickly. In conservative label holding mode, a LSR can
reduce the number of label bindings.
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Chapter 2 MPLS Configuration
15