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Why does not choose the small MED value routing between the same route comparing

Latest reply: Apr 10, 2016 19:14:25 1378 1 0 0 0

Why does not choose the small MED value routing between the same route comparing?

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Created Apr 10, 2016 19:14:25

The EBGP neighbor was established between the three AS inconsistent MSR, which the RTC received internet routing from RTA and RTB. According to the requirements of the RTC, RTA will send RTC routing which setting the MED value of 50, while the RTB sent to the RTC with MED 100. RTC hopes to choose the smallest MED value as the best route for the same destination, for the same destination, the RTA link as the primary link through RTB link as a backup link.  RTC does not choose the route from RTA as the best, why?
When the MSR router chooses the route, a number of factors need to be considered, including local priority, AS path length, origin type, and MED value. In the case when all values are same except the MED, the route with smaller MED value should be selected as the best route. It should be noted that the MED value is only comparable between routing from the same AS. In order to be able to compare MED values between different AS from the same route, the route with smallest MED value is the best route, we need to configure the compare-different-as-med command in BGP, BGP VPN view.
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