Network & Infrastructure
A router is rebooted during maintenance while it still attracts transit traffic. Fast neighbor recovery afterward does not eliminate the avoidable loss during shutdown and restart.
OSPF & Underlay Convergence2 นาทีในการอ่าน
อ่านบทความ : Drain an OSPF transit router before planned maintenance
Network & Infrastructure
An IPv6 route points to a link-local next hop that an engineer mistakes for an unusable address. A separate neighbor-discovery issue may be the actual forwarding failure.
OSPF & Underlay Convergence1 นาทีในการอ่าน
อ่านบทความ : OSPFv3 link-local next hops and incomplete IPv6 troubleshooting
Network & Infrastructure
During a topology change, traffic briefly loops between routers even though their final routing tables are correct. Independent recalculation and installation can create a temporary inconsistent forwarding graph.
OSPF & Underlay Convergence1 นาทีในการอ่าน
อ่านบทความ : OSPF ECMP reconvergence and transient microloops
Network & Infrastructure
A troubleshooting team sees a destination LSA and concludes the network should forward correctly. The route may fail calculation, lose protocol preference or never reach hardware.
OSPF & Underlay Convergence1 นาทีในการอ่าน
อ่านบทความ : OSPF LSDB, RIB and FIB: prove where a route disappears
Network & Infrastructure
A remote MAC appears in BGP EVPN while unicast packets never reach the destination host. Control-plane learning can succeed even when VTEP-to-VTEP forwarding is broken.
EVPN, VXLAN & Data Center Fabrics1 นาทีในการอ่าน
อ่านบทความ : EVPN Type-2 routes present, VXLAN traffic absent
Network & Infrastructure
Two leaf switches advertise the same tenant's endpoints, but each ignores the other's routes. Matching VLAN names can obscure different VNI or route-target assignments.
EVPN, VXLAN & Data Center Fabrics1 นาทีในการอ่าน
อ่านบทความ : VNI and route-target mismatch across a tenant fabric
Network & Infrastructure
An operator changes a route distinguisher to fix an import problem. The change churns advertisements while the receiving tenant still lacks the route because import policy remains wrong.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : Route distinguisher versus route target in EVPN troubleshooting
Network & Infrastructure
Known unicast works across the fabric, but a new host cannot resolve its neighbor or receive broadcast traffic. Missing replication membership can affect discovery before any remote MAC is learned.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : Missing EVPN Type-3 routes and silent BUM loss
Network & Infrastructure
A moved workload remains unreachable even though its new MAC location is known. A stale advertised IP binding can make local ARP suppression answer with outdated information.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : EVPN ARP suppression with stale IP-to-MAC bindings
Network & Infrastructure
An endpoint alternates between two VTEPs faster than a legitimate migration could explain. Increasing mobility sequences can reflect a loop or duplicated attachment rather than an actively moving VM.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : MAC mobility sequence jumps and a hidden Layer-2 loop
Network & Infrastructure
A tenant works on one rack but fails after moving to another. The distributed gateway IP exists everywhere, yet gateway MAC or subnet configuration differs between leaf switches.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : Distributed anycast gateway consistency across leaves
Network & Infrastructure
Same-subnet communication succeeds across the overlay, while inter-subnet traffic fails only through one destination leaf. Its L2 VNIs may be correct but the routed tenant context incomplete.
EVPN, VXLAN & Data Center Fabrics2 นาทีในการอ่าน
อ่านบทความ : Symmetric IRB: diagnose a missing L3 VNI on one leaf