Cisco
560 incident problems in Cisco environments.
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All problems (560)
NETWORK-351A VLAN handoff trunks correctly while one voice endpoint still receives LLDP policy from a switch profile that no longer matches the access template during a staged decommissionLayer 2 reachability exists and endpoint policy negotiation does not. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.NetworkIntermediate16 minProNETWORK-142A VLAN translation on the access switch is correct for user traffic, but LLDP frames stay untranslated and IP phones never discover the voice policyData works while onboarding fails because control-plane frames did not follow the same translation assumption.NetworkIntermediate16 minProNETWORK-136DHCP snooping trust is correct in the running config, but stack renumbering loses it from the new uplink member after reloadClient onboarding fails only after a restart because the logical uplink identity changed under the stack.NetworkIntermediate16 minProNETWORK-120IPv4 default routing is stable, but RA guard blocks new IPv6 gateway updates and dual-stack clients degrade graduallyConnectivity seems mostly fine until IPv6 freshness matters, because the edge no longer permits router advertisements from the intended gateway.NetworkIntermediate16 minProNETWORK-131One switch in the ring has the wrong MST region name, and the topology becomes a boundary only after a reboot reloads the saved configThe live network was temporarily aligned, but the persisted spanning-tree identity says otherwise.NetworkIntermediate16 minProNETWORK-123Storm control on an uplink clamps ARP bursts during failover and clients intermittently lose gateway discoveryThe network remains mostly up, but protection tuning now interferes with a valid convergence burst.NetworkIntermediate16 minProNETWORK-145The DHCP server is reachable, but Option 82 formatting changed during a switch replacement and the server now classifies the circuit incorrectlyAddress assignment survives at layer 3, yet edge identity metadata no longer matches the server's policy rules.NetworkIntermediate16 minProNETWORK-288A campus access stack advertises the voice VLAN while the downstream trunk template still prunes it on the uplink during a failover rehearsalPhones discover the right segment and the wired path never carries it end to end. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-240A DHCP snooping database is written locally while the standby supervisor never receives the binding state during a failover rehearsalThe live chassis knows the clients and failover starts from an empty trust picture. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-186A relay path reaches the DHCP server while circuit identity metadata no longer matches the edge that sends it during a failover rehearsalThe server is up and the server-side policy no longer classifies the circuit the way the access layer expects. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-168User traffic survives a VLAN translation while onboarding protocols never see the same identity during a failover rehearsalThe data plane looks healthy and the control plane for voice or discovery still breaks. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-467A VLAN handoff trunks correctly (Auth and Session Failure)A VLAN handoff trunks correctly (Auth and Session Failure) focuses on Switching And Vlan Design and asks the reader to isolate Auth and Session Failure in Cisco. 실무에서는 auth-and-session-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate18 minProNETWORK-471A VLAN handoff trunks correctly (Auth and Session Failure)A VLAN handoff trunks correctly (Auth and Session Failure) focuses on Switching And Vlan Design and asks the reader to isolate Auth and Session Failure in Cisco. 실무에서는 auth-and-session-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate18 minProNETWORK-530A VLAN handoff trunks correctly (Auth and Session Failure)A VLAN handoff trunks correctly (Auth and Session Failure) focuses on Switching And Vlan Design and asks the reader to isolate Auth and Session Failure in Cisco. 실무에서는 auth-and-session-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate20 minProNETWORK-647A VLAN handoff trunks correctly (Auth and Session Failure)A VLAN handoff trunks correctly (Auth and Session Failure) focuses on Switching And Vlan Design and asks the reader to isolate Auth and Session Failure in Cisco. 실무에서는 auth-and-session-failure 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkIntermediate21 minProNETWORK-1630A multicast boundary is right and one flow still failsOne multicast flow still fails after a boundary update.NetworkIntermediate10 minProNETWORK-1720A QoS handoff stays reachable and voice still degradesVoice still degrades after a QoS handoff update.NetworkIntermediate11 minProNETWORK-1730A QoS policy is deployed and voice still degradesVoice still degrades after a QoS policy rollout.NetworkIntermediate11 minProNETWORK-1740A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minProNETWORK-1750A QoS policy is deployed and voice still degradesVoice still degrades after a QoS rollout.NetworkIntermediate11 minPro