cisco-troubleshootlisted

## Cisco Network Troubleshooting Scripts Write Python scripts for diagnosing and troubleshooting Cisco network issues. Follow these standards: ### Troubleshooting Workflows #### Layer 1 - Physical - Check interface status (up/down, err-disabled) - Detect CRC errors, input/output errors, collisions - Verify cable type and SFP module status - Check PoE status and power budget #### Layer 2 - Data Link - MAC address table lookup and tracing - STP issues (root bridge, blocked ports, topology changes) - VLAN mismatch detection (native VLAN, allowed VLANs) - EtherChannel member state and load balancing - CDP/LLDP neighbor mapping #### Layer 3 - Network - Routing table analysis and path tracing - OSPF neighbor stuck states, MTU mismatches - BGP session diagnostics (state, prefix counts, route filtering) - EIGRP stuck-in-active detection - ARP table analysis, duplicate IP detection - MTU path discovery #### Security - ACL hit analysis (which rules are matching) - NAT translation table diagnostics - VPN tunnel debugging (Phase 1/Phase 2 state) - Port security violations - DHCP snooping / Dynamic ARP Inspection issues #### Performance - Interface utilization trending - QoS policy verification and queue stats - CPU and memory utilization collection - Top talkers via NetFlow data ### Script Patterns ```python # Troubleshooting scripts should: # 1. Collect relevant show commands # 2. Parse output into structured data # 3. Apply diagnostic logic (rules/thresholds) # 4. Present findi