Switching And Vlan Design
106 incident problems about Switching And Vlan Design. Start with the reviewed ones.
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All problems (106)
NETWORK-147A stack member replacement preserves the running config, but the trust device list for MACsec was stored in startup only and secure links never return after rebootOperations seem fine until the mandatory reboot reveals that a security dependency was not restored in both config states.NetworkIntermediate16 minProNETWORK-128IPv6 ND inspection keeps a stale binding after renumbering, and hosts with new addresses cannot pass traffic on the access edgeSecurity stays enabled, but address lifecycle assumptions lag behind the renumbered endpoint state.NetworkIntermediate16 minProNETWORK-228An STP root move succeeds while BPDU guard from an access template errdisables the recovery uplink during a failover rehearsalThe topology change is valid and an inherited safeguard still treats it as hostile. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-198Runtime security state is correct while the saved device identity needed after reboot was never updated during a failover rehearsalOperations look healthy until a restart makes the old hardware identity matter again. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkIntermediate17 minProNETWORK-134A LACP bundle works until one side silently flips to passive during replacement and the port-channel collapses to a single linkMost traffic still passes, but capacity and redundancy disappear because only one side is actively negotiating now.NetworkIntermediate15 minProNETWORK-157A Wi-Fi controller advertises the correct guest SSID, but the upstream switch trunk prunes the new VLAN after a template reapplyClients can associate, yet the data plane for the new segment never exists end to end.NetworkIntermediate15 minProNETWORK-118LLDP-MED advertises the voice VLAN, but the access switch data policy overrides it after a bouncePhones boot into the right segment once, then move unexpectedly because another edge policy reclassifies the port after link renegotiation.NetworkIntermediate15 minProNETWORK-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-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-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-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-1720A QoS handoff stays reachable and voice still degradesVoice still degrades after a QoS handoff update.NetworkIntermediate11 minPro