Cisco
560 incident problems in Cisco environments.
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All problems (560)
NETWORK-058Controller telemetry fails although the management VRF can still ping the destinationBasic reachability tests look fine, but telemetry and API registration fail because the source interface or VRF binding used by the application differs from the test command path.NetworkAdvanced23 minProNETWORK-062MLAG peer link is healthy but the orphan VLAN is not allowed and ARP blackholes one rackThe chassis pair stays up, yet half the rack cannot resolve the gateway because the affected VLAN was never permitted across the peer path.NetworkAdvanced23 minProNETWORK-1204OSPF area design looks correct but summary routing hides one more specific path after migrationInter-area reachability mostly works, yet one destination disappears because a migrated summary route now masks the more specific path operators expected to win.NetworkAdvanced23 minProNETWORK-085VXLAN VTEP peers are reachable but the overlay MAC table never learns one tenant segmentThe underlay looks healthy, yet one tenant still cannot communicate because the overlay learning path or segment mapping is broken for that VNI only.NetworkAdvanced23 minProNETWORK-1189IOS XR eBGP session is up but policy omission means zero route exchangeThe BGP session establishes successfully, yet no routes move because an inbound or outbound policy required by the platform was omitted.NetworkAdvanced24 minProNETWORK-063Route reflector strips a BGP community and upstream traffic engineering stops workingSessions remain established and routes are present, but the intended upstream policy no longer triggers because a critical community vanished in the reflection path.NetworkAdvanced24 minProNETWORK-035BGP session is established but the expected prefix never reaches the RIBThe neighbor shows Established, yet the target route is absent because a prefix list, route map, or best-path rule discards it before installation.NetworkAdvanced26 minProNETWORK-060SD-WAN policy prefers the worse pathThe controller has path metrics, but the application policy still chooses the higher-latency circuit because the SLA measurement feeding the decision is scoped incorrectly.NetworkAdvanced27 minProNETWORK-039VRF leak design misses the import policy for a shared services subnetThe route exists in the source VRF, but shared services remain unreachable because the target VRF never imports the right route target or policy match.NetworkAdvanced27 minProNETWORK-1029A QoS policy marks the right classes (Timeouts and Latency)A QoS policy marks the right classes (Timeouts and Latency) focuses on Network Services And Operations and asks the reader to isolate Timeouts and Latency in Cisco. 실무에서는 Timeouts and Latency 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkAdvanced28 minProNETWORK-1579A DHCP Option 82 template is updated and one relay still tags the old circuit idOne relay still tags the old circuit id after Option 82 template cleanup.NetworkIntermediate8 minProNETWORK-1589A DHCP policy is corrected and one relay still inserts the old circuit-idOne relay still inserts the old circuit-id after policy correction.NetworkIntermediate8 minProNETWORK-1599A DHCP relay template is updated and one switch still tags the old site codeOne switch still tags the old site code after DHCP relay template updates.NetworkIntermediate8 minProNETWORK-1569A DHCP snooping template updates and one access switch still trusts the wrong uplinkOne access switch trusts the wrong uplink after snooping template updates.NetworkIntermediate8 minProNETWORK-1586A dual-stack RA template is updated and one WLAN still prefers IPv4One SSID still prefers IPv4 after dual-stack template updates.NetworkIntermediate8 minProNETWORK-1556A dual-stack route is added and one host still prefers the old IPv4 pathOne host ignores the new dual-stack preference after resuming from sleep.NetworkIntermediate8 minProNETWORK-1596A dual-stack SSID change is correct and one WLAN still prefers IPv4One WLAN still prefers IPv4 after a dual-stack SSID change.NetworkIntermediate8 minProNETWORK-1566A dual-stack WLAN update lands and one client still prefers IPv4Clients on one SSID still prefer IPv4 after a dual-stack rollout.NetworkIntermediate8 minProNETWORK-1560A DHCP relay helper is updated and one subnet still gets the wrong option setOne subnet receives the wrong DHCP options after relay migration.NetworkIntermediate9 minProNETWORK-1506A VLAN migration completes and one voice subnet loopsVoice endpoints loop only on ports cloned from an older access template during a VLAN migration.NetworkIntermediate9 minPro