Network Config Validation

Runs regex-based preflight checks on Cisco IOS and IOS-XE configs before you push changes to production routers and switches. Flags destructive commands like reload or no router bgp, catches duplicate IPs and overlapping subnets, spots stale references to ACLs or route-maps that don't exist, and checks management-plane hygiene like missing SSH-only enforcement or default SNMP communities. It's not a full parser, so you still need human review for intent and rollback planning, but it's a solid gate before Ansible or Netmiko runs hit live devices. Best used as a blocking check in your automation pipeline or as a second set of eyes during change windows.