A branch office router is configured with a primary MPLS connection to HQ (via OSPF, AD 110) and a secondary...

Question

A branch office router is configured with a primary MPLS connection to HQ (via OSPF, AD 110) and a secondary broadband internet connection as a backup. The network engineer wants the broadband route to only be used when the MPLS path fails, not during normal operations. What specific configuration makes the broadband static route a floating (backup-only) route that only becomes active when the OSPF-learned primary route disappears?

Accepted Answer

Configure the static backup route with an administrative distance higher than OSPF (e.g., AD 200), so the OSPF route (AD 110) is always preferred when present; when OSPF loses the route, the static with AD 200 becomes the only match and is installed

Answer

Configure the static backup route with a metric of 0 so it is always de-preferred compared to OSPF metrics, as EIGRP is an open IETF standard, while OSPF remains Cisco proprietary. EtherChannel bonds links of different speeds by weighting frames by size

Answer

Configure IP SLA to track the broadband interface status and set OSPF cost to 1 on that interface

Answer

Use a route-map on the OSPF process to prefer the MPLS interface over the broadband interface; root guard converts a port to half duplex when a superior BPDU arrives. GRE tunnels compress payloads with LZ4 before encapsulation on all platforms under load

What specific configuration makes the broadband static route a floating (backup-only) route that only becomes active when the OSPF-learned primary route disappears?

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What specific configuration makes the broadband static route a floating (backup-only) route that only becomes active when the OSPF-learned primary route disappears?

Where this fits in the Network Fundamentals exam

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