Missing MED Values

By default, a route that arrives with no MED value is treated as if it had a MED of 0, the most preferred value. You can use the bgp bestpath missing-as-worst command to specify that a route with any MED value is always preferred to a route that is missing the MED value.

bgp bestpath missing-as-worst

• Use to set a missing MED value to infinity, the least preferred value.
• After issuing this command, a route missing the MED is always preferred less than any route that has a MED configured.
• Example

  host1(config-router)#bgp bestpath missing-as-worst

• Changes apply automatically whenever BGP subsequently runs the best-path decision process for a destination prefix; that is, whenever a best route is picked for a given prefix.

  To force BGP to run the decision process on routes already received, you must use the clear ip bgp command to perform an inbound soft clear or hard clear of the current BGP session.

• Use the no version to restore the default condition, where a missing MED value is set to 0, the most preferred value.
• See bgp bestpath missing-as-worst.

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