BGP Notes - Backdoor Routes

• The fact that eBGP has an AD of 20 can be a problem.
  • You may have a very short path via EIGRP (or OSPF or RIP or whatever other IGP), but the longer eBGP path will be preferred.
• For God’s sake, do not lower the AD of EIGRP!  Havoc will ensue.
• Using backdoor routes causes eBGP routes to have an AD of 200.
  • Allows the shorter-path IGP routes to be added to the routing table.

router bgp 123
 network 1.1.1.0 backdoor

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