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Cisco Certified Network Associate (CCNA) · Cisco
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There are various reasons for the interface to go into errdisable. The reason can be: Duplex mismatch Port channel misconfiguration BPDU guard violation UniDirectional Link Detection (UDLD) condition Late-collision detection Link-flap detection Security violation Port Aggregation Protocol (PAgP) flap Layer 2 Tunneling Protocol (L2TP) guard DHCP snooping rate-limit Incorrect GBIC / Small Form-Factor Pluggable (SFP) module or cable Address Resolution Protocol (ARP) inspection https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/69980-errdisable-recovery.html#anc8
Thank you so much bro
The Errdisable error disable feature was designed to inform the administrator when there is a port problem or error. The reasons a catalyst switch can go into Errdisable mode and shutdown a port are many and include: Duplex Mismatch Loopback Error Link Flapping (up/down) Port Security Violation Unicast Flodding UDLD Failure Broadcast Storms BPDU Guard