Abstract: Techniques are described for migrating data traffic, based on a new protocol priority value, from one Label Switched Path (LSP) assigned a higher initial protocol priority value to another LSP assigned a lower initial protocol priority value. For example, a network may initially establish a resource reservation LSP associated with a resource reservation protocol assigned a higher initial protocol priority value than a segment routing protocol used to establish a segment routed LSP. Rather than being unable to send data traffic on an established segment routed LSP because the segment routing protocol has a lower initial protocol priority than the resource reservation protocol, an ingress router may receive from a centralized controller a message specifying a new protocol priority value assigned to the segment routed LSP in response to which the ingress router may create or update its initial protocol priorities, and forward data traffic along the segment routed LSP.

Abstract: Techniques are described for establishing a segment routed label switched path (LSP) regardless of whether a router along the shortest path is not enabled for segment routing. For example, a resource reservation LSP (e.g., a resource reservation protocol (RSVP) LSP) is established across the router that is not enabled for segment routing, such that the segment routed LSP may be established to tunnel through the resource reservation LSP. For example, when a centralized controller receives a request to establish a path using segment routing, one or more routers along the shortest path may not be enabled for segment routing. Instead of rejecting the request to establish the segment routed LSP in response to determining that one or more routers in a selected path are not enabled for segment routing, the controller may establish a resource reservation LSP to tunnel around the router that is not enabled for segment routing.

Abstract: Techniques are described for establishing a segment routed label switched path (LSP) regardless of whether a router along the shortest path is not enabled for segment routing. For example, a resource reservation LSP (e.g., a resource reservation protocol (RSVP) LSP) is established across the router that is not enabled for segment routing, such that the segment routed LSP may be established to tunnel through the resource reservation LSP. For example, when a centralized controller receives a request to establish a path using segment routing, one or more routers along the shortest path may not be enabled for segment routing. Instead of rejecting the request to establish the segment routed LSP in response to determining that one or more routers in a selected path are not enabled for segment routing, the controller may establish a resource reservation LSP to tunnel around the router that is not enabled for segment routing.