Huawei Technologies Co., Ltd. Packet switching network usually contains links formed by non-fiber media, e.g., copper, radio, etc. Some kinds of non-fiber links have non-fixed bandwidth capacity because they are very sensitive to external environment. This document describes an extension for GMPLS RSVP-TE signaling for setting up a LSP in a PSN network which contains non-fixed bandwidth link by introducing an optional availability field in GMPLS signaling.