Hi, Community!
This post is about the label advertisement Mode - DU. Please see more details on the topic as you read further down this post.
BACKGROUND INFORMATION
The MPLS network can issue labels in different ways. In the network shown in the figure, the label advertisement mode is downstream unsolicited (DU) between the SWB and the SWA.
CONCLUSIONS
The SWA does not request a label from the SWB and the SWB still sends a label mapping message to the SWA.
The SWB does not request a label from the SWA and the SWA still sends a label mapping message to the SWB.
By default, the label advertisement mode is downstream unsolicited (DU).
This would be all on the label advertisement Mode - DU. Thanks for reading this post!