Using border gateway protocol to expose maximum segment identifier depth to an external application
Abstract:
A method of exposing a maximum segment identifier depth (MSD) value of the network device is described. The method comprises transmitting to a centralized controller an attribute Type Length Value (TLV). A type of the attribute TLV includes a type of a maximum segment identifier depth (MSD) indicating that the MSD is a link MSD, a length of the attribute TLV includes a length of the MSD, and a value of the attribute TLV includes the MSD, which is a maximum number of segment routing (SR) labels supported at a link of the network node. The centralized controller is to use the attribute TLV to compute an SR tunnel with one or more SR labels, a label stack depth of the SR tunnel does not exceed the MSD, and the SR labels are used for steering a packet through an SR network.
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