A school district runs EIGRP over DMVPN Phase 3 and must keep spoke routes usable without classic hub split-horizon or next-hop problems. Which design consideration is most accurate?
Select an answer to reveal the explanation.
Short Explanation
EIGRP on a multipoint hub is picky: split horizon will hide spoke routes from other spokes like a teacher who never repeats announcements. Disable split horizon on the hub tunnel (and get next-hop right) so Phase 3 routing matches the shortcuts. Static-only is not required.
Full Explanation
On DMVPN hub tunnels, EIGRP split horizon can prevent the hub from advertising one spoke’s prefixes to other spokes on the same multipoint interface. Disabling split horizon on the hub tunnel — and ensuring next-hop behavior fits the overlay — lets spokes learn remote spoke networks appropriately for Phase 3. EIGRP is supported on mGRE; disabling NHRP fights the DMVPN model. Treat hub EIGRP carefully as a first-class design item for school WANs.