Cisco Port ErrDisabled

Monitoring

To monitor your Cisco Catalyst devices for ErrDisabled state:

  1. Configure a Cisco IOS user with privilege level 1.
  2. Store ‘ssh.user‘ & ‘ssh.pass‘ as device properties.
  3. Ensure EventSource ‘Cisco_Interface_ErrDisabled‘ is in your LogicMonitor portal.

Use Case:

When a Cisco switch configuration shows a port in an enabled state, but the software experiences errors on the specified port, the software will automatically disable that port. When the port is in ErrDisabled state, it is shutdown and no traffic can be sent or recieved on that specified port. Additionally, the port LED will illuminate solid orange.

Common Causes for ErrDisabled:

The most common causes of port ErrDisabled state are the following:

  • Cable may be defective, incorrect type or too long.
  • Issues with NIC (Network Interface Card) either physical or software.
  • Duplex Misconfigured (i.e. Failure to negotiate speed & duplex between two directly connected hosts)
  • Port Misconfiguration
  • BPDU Guard Violation
  • UniDirectional Link Detection (UDLD)
  • Late Collision Detection
  • Link Flap
  • Security Violations
  • 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
  • Inline Power

Supported Devices:

– The ErrDisabled feature is supported on the following Cisco Catalyst Switches:

Cisco IOS Software – 2900XL / 3500XL
– 2940 / 2950 / 2960 / 2970
– 3550 / 3560 / 3560-E / 3750 / 3750-E
– 4000 / 4500
– 6000 / 6500
Catalyst OS (CatOS) Software – 2948G
– 4000 / 4500
– 5000 / 5500
– 6000 / 6500
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