The city underlay will use EBGP between leaves and spines. Which characteristic best matches that IP fabric routing approach?
Select an answer to reveal the explanation.
Short Explanation
EBGP underlay is like each hop speaking “neighbor ASN” across the leaf-spine cables, then ECMP-balancing equal BGP paths. It is not “one giant ASN and hope” or “static defaults forever.” Plan ASN layout so multipath still works.
Full Explanation
EBGP IP fabrics typically run external BGP on leaf-spine links with an ASN allocation scheme that enables multiple equal-cost BGP paths for ECMP. That differs from an iBGP-only full-mesh model, pure IGP substitution on every link, or static-only underlays. ASN design and multipath knobs are part of the EBGP fabric pattern. Overlay control planes still ride on reachable underlay endpoints.