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PACKETDOJO GUIDES

BGP peering and route advertisement labs

Practice BGP peering and route advertisement in simulated networks with editable router configurations.

Trace the prefix from its origin

Begin at the router that owns the service. Check the local route, the BGP origination configuration, and the prefixes learned by the next peer.

Compare reciprocal configuration

A peer relationship depends on both routers agreeing about the session. A single remote-AS typo can disconnect a service while the interface addresses remain reachable.

Apply and verify

Fix the peer or origination statement, then inspect the resulting BGP paths and verify the service. Network tests determine whether the repair works; the AI tutor cannot decide that a lab passes.

Protocol reference: BGP-4 protocol specification — RFC 4271.

PUT THE IDEA TO WORK

A prefix without a voice

Miami edge. Parallel three-site metro paths have cross-links at each stage, between independent client and service handoffs. BGP carries the primary service prefix, but the connected secondary service subnet is absent from remote BGP tables. Investigate the two service networks from R1: 10.202.64.0/24 to 10.202.78.0/24 (TCP/443), and 10.202.65.0/24 to 10.202.79.0/24 (TCP/8443).

Network topology8 devices 9 links

A prefix without a voice — network topologyR1: Client edge. R2: West north. R3: Central north. R4: East north. R5: West south. R6: Central south. R7: East south. R8: Service gateway. R1 connects to R2. R2 connects to R3. R3 connects to R4. R5 connects to R6. R6 connects to R7. R2 connects to R5. R3 connects to R6. R4 connects to R7. R7 connects to R8. Connections show physical links, not service health.R1 ↔ R2 · 10.202.80.0/30R2 ↔ R3 · 10.202.81.0/30R3 ↔ R4 · 10.202.82.0/30R5 ↔ R6 · 10.202.83.0/30R6 ↔ R7 · 10.202.84.0/30R2 ↔ R5 · 10.202.85.0/30R3 ↔ R6 · 10.202.86.0/30R4 ↔ R7 · 10.202.87.0/30R7 ↔ R8 · 10.202.88.0/30R1Client edgeR1 · Client edgeR2West northR2 · West northR3Central northR3 · Central northR4East northR4 · East northR5West southR5 · West southR6Central southR6 · Central southR7East southR7 · East southR8ServicegatewayR8 · Service gateway
Physical links · Service health not shown
Link addressing (9)
  • R1 R210.202.80.0/30
  • R2 R310.202.81.0/30
  • R3 R410.202.82.0/30
  • R5 R610.202.83.0/30
  • R6 R710.202.84.0/30
  • R2 R510.202.85.0/30
  • R3 R610.202.86.0/30
  • R4 R710.202.87.0/30
  • R7 R810.202.88.0/30

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