When troubleshooting BGP, you need visibility into how others see your routes.
Looking glasses: Web interfaces to query BGP tables from remote networks.
Common queries:
- "show ip bgp [prefix]" shows route attributes
- "show ip bgp summary" shows peer states
- Traceroute from remote location
Public tools:
- bgp.he.net: Prefix and ASN information
- bgpstream.com: Real-time BGP events
- RIPE RIS and RouteViews: Historical data
- peeringdb.com: Network peering policies
Use these when traffic takes strange paths or your prefix isn't reachable.