A Looking Glass is a web front end giving limited access to a router or route-collector/server for:

• Viewing the BGP table
• Allowing IXP members to verify their outbound BGP policies
• Viewing individual paths
• Checking traceroute and ping to destinations
• Checking RPKI status

There are several Looking Glass implementations:

• Birdspy (only for bird)
• G Mazoyer’s Looking Glass
• John Frazier's original
• John Heasley’s built in to RANCID

Some operators (network and IXP) write their own implementations to match their particular requirements.

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