cyberneticlibrary

Diagnose BGP routing issues

network-bgp-diagnosticsskillsetup L20
Sheshiyer/skill-clusters
What it does

Diagnose BGP session state and route exchange

Best for

Rapid BGP troubleshooting without disruptive device resets.

Inputs
  • · neighbor IP
  • · show command output
  • · logs
Outputs
  • · state diagnosis
  • · policy analysis
  • · remediation steps
Requires
  • · Cisco IOS/IOS-XE device access
Preconditions

Network device access, BGP session exists, CLI credentials valid

Failure modes
  • · VRF/address-family mismatch
  • · Parser fails on platform variant
  • · Incomplete route visibility without received-routes config
Trust signals
  • · State interpretation table with first checks
  • · Transport and policy check flows
  • · AS-path regex examples with token boundaries
  • · Anti-patterns section listing 5 mistakes