
494 Chapter 10 Generalized MPLS (GMPLS)
an LSC LSP. Since the bandwidth granularity of the LSC LSP is likely to be high
compared with the PSC flow, this approach offers the possibility of tunneling
multiple PSC LSPs through the same LSC LSP and thereby making more efficient
use of the available resources.
10.1.8 What Is a Label?
Having established that LSPs can be set up to switch data at different granulari-
ties, it is necessary to identify exactly what a label is in each switching mode.
Simply put, a label is the identifier for the quantity that is switched, so just as
in MPLS a label identifies ...