A fire district sources iBGP sessions from loopback addresses on each router. What dependency must remain true for those sessions to stay up and for next hops to resolve?
Select an answer to reveal the explanation.
Short Explanation
iBGP over loopbacks is two firehouses calling each other by station number, not by the street they’re on today. The IGP has to know how to reach those station numbers, or the call never connects—and next hops still need a route.
Full Explanation
iBGP sessions bound to loopbacks require an underlying IGP (or other underlay) to reach those loopbacks independently of any single transit interface. Operators typically set update-source to the loopback and ensure BGP next hops resolve via the IGP. eBGP multihop is an eBGP concept, not a substitute for iBGP underlay reachability. Disabling the civic IGP breaks both session stability and next-hop resolution.