Vendor560 problems· 4 reviewed

Cisco

560 incident problems in Cisco environments.

All problems (560)

NETWORK-357An SD-WAN overlay advertises the alternate circuit while local breakout policy still hairpins one SaaS prefix through the retired hub during a staged decommissionThe control-plane converged and the application policy path did not. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.NetworkAdvanced17 minPro NETWORK-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 minPro NETWORK-1224DHCP relay looks right but one access stack still never gets leasesMost clients receive leases, but one switch stack does not after an access VLAN reshuffle.NetworkIntermediate17 minPro NETWORK-1212OSPF neighbors stay in Two-WayOperators see stable Two-Way neighbors and interpret it as a failure state.NetworkIntermediate17 minPro NETWORK-1181OSPF neighbors stay in two-way on shared segmentAn operator follows a Cisco Community thread after seeing two-way adjacency on a shared segment and escalates it as broken routing.NetworkIntermediate17 minPro NETWORK-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 minPro NETWORK-381A multicast boundary permits the intended groupA multicast boundary permits the intended group focuses on Network Services And Operations and asks the reader to isolate Rollout Stuck in Cisco. 실무에서는 rollout-stuck 이슈를 볼 때 DNS, 라우팅, ACL/방화벽, 목적지 응답을 계층별로 잘라서 확인하면 장애 구간을 훨씬 빠르게 좁힐 수 있습니다.NetworkAdvanced18 minPro NETWORK-276A multicast PIM neighbor forms while the RPF route still points at the wrong side of the tree during a failover rehearsalControl-plane adjacency exists while the forwarding lookup that matters disagrees. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkAdvanced18 minPro NETWORK-551AAA succeeds on the core path (Permission Denied)AAA succeeds on the core path (Permission Denied) focuses on Network Services And Operations and asks the reader to isolate Permission Denied 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 minPro NETWORK-555AAA succeeds on the core path (Permission Denied)AAA succeeds on the core path (Permission Denied) focuses on Network Services And Operations and asks the reader to isolate Permission Denied 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 minPro NETWORK-101An OSPF sham link comes up, but the cost still makes the MPLS VPN choose the slower backdoor pathAdjacency is healthy, yet path selection remains wrong because the cost model still favors the unintended route source.NetworkAdvanced18 minPro NETWORK-1199ARP looks fine on one VLAN but the upstream gateway still misses repliesAn interface bounce after maintenance leaves one part of the forwarding path with stale or aged-out MAC state, so return traffic behaves inconsistently even though ARP looks normal.NetworkIntermediate18 minPro NETWORK-1214DHCP relay is configured but clients still never get leasesA switch shows the helper address on the intended SVI, but new clients still never receive leases after an access template change.NetworkIntermediate18 minPro NETWORK-1201Spanning-tree looks stable but one trunk still discards the VLANOperators focus on spanning tree because the path is intermittent after a change. Community threads point out that one trunk never had the VLAN in its allowed list.NetworkIntermediate18 minPro NETWORK-114The multicast rendezvous point is reachable, but SSM clients failCore multicast signaling looks healthy, yet receivers never join the intended streams because the edge protocol expectation differs.NetworkAdvanced18 minPro NETWORK-318A multicast RP pair is configured while one group range is filtered from MSDP state propagation and failover never restores those streams during a failover rehearsalRedundancy exists and one class of streams never inherits it. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.NetworkAdvanced19 minPro NETWORK-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 minPro NETWORK-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 minPro NETWORK-140Both HSRP routers relay DHCP, and clients intermittently receive duplicate offersGateway redundancy is healthy, but an adjacent service now answers twice because both paths forward the same broadcast.NetworkIntermediate15 minPro NETWORK-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 minPro