As discussed in Chapter 7, with RSVP-TE, the interfaces used by an LSP may be controlled by at explicit route via the ERO or ERO hop. This allows the LSP to control which nodes/interfaces it goes in and out on. The problem is that the ERO and ERO hop do not support explicit label aneobrects, w hich mea ns that they cdnnot support t he granu i apity needed by optical networks. For example, in networks that are not packet-based, LSPs sometimes need to be spliced together. This means that the tail end of an LSP needs to be spliced with the head end of another LSP. GMPI_S introduces t lie ERO subobjecmERO hop to allow flnee granhla^ My for explidt randes.
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