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Network Engineering Cases

2 real-world cases documented by African engineers. Learn from their troubleshooting experience.

All VendorsCISCOHUAWEIJUNIPERNOKIAZTEERICSSON
NA

Ngozi Adeyemi

CISCO CCNP · Airtel Nigeria · Jun 5, 2026

RESOLVEDHIGH

OSPF Adjacency Failure after IOS-XE 17.9.3 Upgrade

OSPF adjacencies dropped on all P2P links post-upgrade. EXSTART/EXCHANGE loop observed.

OSPFIOS-XEUpgrade
180154
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EO

Emeka Okafor

CISCO CCIE · MTN Nigeria · Jun 5, 2026

RESOLVEDCRITICAL

BGP Route Flapping on PE Router – Lagos PoP

Intermittent BGP session resets on PE-LAG-01 every ~4 minutes. Hold-timer expire events in MRT logs.

BGPMPLSCore
621253
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