Patent ID: 10277505

Abstract:
Techniques are described for routing inter-AS LSPs with a centralized controller taking inter-AS TE metric values for inter-AS links into account. The inter-AS TE metric values, e.g., local preference values, MED values, or EROS, indicate route preferences for routes between ASes. The disclosed techniques enable network devices within either or both of a first AS and a second AS to store inter-AS TE metric values for inter-AS links in TEDs of the network devices. The network devices then send the contents of their TEDs, including the inter-AS TE metric values, to a centralized controller of the first AS and the second AS. The centralized controller computes an inter-AS LSP across the first AS and the second AS based at least in part on the inter-AS TE metric values such that the inter-AS LSP includes a preferred one of the inter-AS links as indicated by the inter-AS TE metric values.