Route Redistribution - Protocol-Specific Configuration

4 important questions on Route Redistribution - Protocol-Specific Configuration

What is important to note about BGP as a Source protocol in Routing Redistribution?

By default it will only redistribute eBGP routes into IGP protocols.

How does EIGRP handle route redistribution as a destination protocol by default?

  • External EIGRP routes are given an AD of 170 and a seed metric of infinity.
  • EIGRP AS routes redistributed into another EIGRP AS all path metrics are included in redistribution.

How does OSPF handle route redistribution as a Destination Protocol by default?

  • The AD is set to 110 for intra and interarea and external routes.
  • External routes are classified as Type 2.
  • Seed metric of 1 for BGP and 20 for other protocols.
  • For OSPF sourced routes path metrics are transferred.
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What are the main differences between OSPF Type 1 and Type 2 external routes?

  • Type 1 routes are preferred over Type 2 routes
  • Type 1 metric equals redistribution metric + tot path metric to the ASBR. Metric increases farther away from the ASBR.
  • Type 2 metric equals only the redistribution metric.

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