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华为： DU+ordered+Liberal
思科：
This Downstream on demand feature adds support for downstream-on-demand mode, where the label is not advertised to a peer, unless the peer explicitly requests it. At the same time, since the peer does not automatically advertise labels, the label request is sent whenever the next-hop points out to a peer that no remote label has been assigned.
To enable downstream-on-demand mode, this configuration must be applied at mpls ldp configuration mode:
mpls ldp downstream-on-demand with ACL | 
转播
